Scam messages have been sent out in the Tax Administration’s name. Read more about scams.
You must complete and submit the Business tax return (5) for every year – including any year when you have not had any activity. If more than one accounting period ended during the tax year, you need to combine the periods to submit just one tax return.
File a return:
Log in to MyTaxThese instructions follow the order of the fields in MyTax.
Report income and expenses without including VAT. However, if you are not liable to pay VAT, enter the expenses with VAT.
Taxpayer details are displayed according to the information received from the Business Information System (ytj.fi).
Change your accounting period and line of business on ytj.fi.
If more than one accounting period has ended during the tax year, report the information on all the accounting periods on one return.
In tax assessment, the income from your business is divided between you and your spouse if your spouse works for the business operation, even if your spouse does not work full time for the company.
Business income is divided into earned income and capital income.
The capital income portion is divided between you and your spouse according to how much of the company’s net assets either one of you owns. The earned income portion is divided according to how much work you have done for the company. Enter the portions for each spouse as percentages in the business tax return.
If you use double-entry bookkeeping, report the following information:
Also report the cash withdrawals and cash investments made during the calendar year:
If you answer Yes to the question Do you use double-entry bookkeeping?, MyTax opens the Specification of equity.
Fill in the details required. MyTax will automatically calculate the negative or positive amount of equity at the end of the accounting period. MyTax will also transfer this information to your next year’s tax return as “Equity at the start of the accounting period”.
If the equity is negative due to private withdrawals and the company has had to loan money to cover the withdrawals, a portion of the loans is allocated to financing of private withdrawals instead of business activities. Interest on such loans is not deductible as a business expense.
In this section, calculate the portion of interest that you cannot deduct from business income due to negative equity.
There may also be restrictions for the deductibility of interest if the equity is positive due to a revaluation increase. Read more about restrictions for the deductibility of interest (Tax Administration's statements on business tax issues, 1531/345/2003).
If pursuant to the provisions of the act on income tax (Tuloverolaki 1535/1992) the interest calculated on the basis of residual negative equity is deductible from a personal source of income, you can deduct it from your capital income on your pre-completed tax return.
You will see this section in MyTax if your equity is negative. MyTax will calculate the amount of non-deductible interest expenses.
Fill in these details in section 11 of the form.
Instructions for filing on paper:
Calculate and report here the non-deductible interest expenses:
If you use your car both for private driving and for business purposes, see instructions.
If you take goods from the company for your own private use, record their value as business income (private use entered as income) in the company’s accounting. You can use the original purchase price of the goods as their value. If the probable selling price of the goods is lower than the original purchase price, you can also use the selling price here.
Example: In 2025, Antti purchased 6 pieces of the same sports equipment for his company. The equipment was intended for sale, and the total price Antti paid was €3,000. This means that the original purchase price for one piece of equipment was €500. Antti takes two pieces of equipment for his own use. He must therefore record €1,000 as business income (2 x €500).
You cannot pay wages to yourself, to your spouse or to your children who are less than 14 years old. If you withdraw money from the company’s bank account, it is considered a private withdrawal. Do not enter it in the accounts as a business expense.
If your spouse works for the business operation, the business income is divided between the two of you in tax assessment.
If you have received public financual support for business operations, you will see those income types here. The details are shown only in MyTax. We have retrieved the information from annual information returns filed by the payors. As payors file their annual information returns by the end of January, the details will be shown in MyTax on 3 February 2026 at the latest. If you want, you can transfer these details to your tax return.
Check the details by clicking Open specification.
You can transfer the information directly to your tax return by selecting Use information. The income details are then copied to the appropriate fields in the tax return. Refunds of public financial support are transferred to the section Other deductions – Other deductions to be added. If necessary, you can make changes to the transferred details.
If you do not want to transfer the information, you can also enter the details in the tax return yourself.
Note:
The amount of net sales is the sales revenue from the company’s regular operations. Enter the revenue without the VAT included in the sales. Also deduct from the revenue any taxes directly based on the volume of sales (such as pharmacy tax) as well as any discounts you have given to customers.
Grants and subsidies include all grants, subsidies and benefits that you have received for your business activities, such as employment subsidies. If you have been granted a VAT relief for small businesses, enter the amount here.
Report here only such grants and subsidies relating to business activities (from the Ministry of Economic Affairs and Employment, Ministry of the Environment, Business Finland, etc.) which have been recorded directly as revenue.
Do not report here any grants you have received from the public sector for the purchasing of fixed assets. Instead, enter them as income indirectly by deducting them from the acquisition cost.
In this section, report information on vehicles that are part of the business operation’s fixed assets. A vehicle is included in the fixed assets of business operations if the number of kilometres driven for business purposes is more than half of the total number of kilometres driven during the tax year.
What to report on a car included in fixed assets on the company’s tax return
Expenses caused by driving for business purposes can be deducted as business expenses. Do as follows:
If you have deducted expenses related to private driving in the company’s accounting, you must add the corresponding amount to the company’s revenue.
See instructions on how to keep a driver’s log and how to calculate the expenses related to private driving
In this section, report the expenses caused by using a private vehicle for business purposes. A vehicle is considered to be private if 50% or less of the kilometres driven during the tax year were for business purposes.
If you use your private car for business purposes, you may be entitled to an additional deduction for the vehicle expenses related to business driving.
You must keep a driver’s log or other similar record of the times you use your private car for business purposes. Do not enclose the driver’s log with the tax return. We will request it if necessary.
The additional deduction cannot be greater than the tax-exempt kilometre allowance for wage earners.
In this section, also report your spouse's additional deduction if you run the business together with your spouse.
If you have deducted the car’s expenses in your company’s accounting, these amounts will be subtracted from the additional deduction. In this case, the additional deduction is the difference between the wage earners’ tax-exempt kilometre allowance and the amount of actual expenses you have deducted in the accounts.
If you have deducted expenses related to private car use in accounting and the total amount of the expenses exceeds the maximum amount of additional deduction calculated according to the Tax Administration’s cost allowance decision, the actual costs will be deducted in the tax assessment. As a result, no additional deduction can be made, so do not fill in this column.
Example 1: During the 2025 tax year, your drove 40,000 km with your car. Of this, 15,000 km were attributable to business use and 25,000 km to private use. Because the car was used more for private purposes than for business purposes, it is considered a private car. The expenses caused by the business use of the car have not been deducted in the company’s accounting. You can therefore make an additional deduction for the 15,000 km of business use: 15,000 km x €0.59 = €8,850.
Example: During the 2025 tax year, your drove 30,000 km with your car. Of this, 5,000 km were attributable to business use and 25,000 km to private use. Because the car was used more for private purposes than for business purposes, it is considered a private car. You have deducted the expenses caused by the business use in your company’s accounting as follows: Average vehicle expenses €5,000 : 30,000 = €0.167/km. Part of the expenses related to business use 5,000 x €0.167 = €835.00. Amount based on the maximum tax-exempt kilometre allowance 5,000 x €0.59 = €2,950.00. Additional deduction €2,950 - €835 = €2,115.
See instructions
What is driving for business purposes?
Enter the total number of kilometres driven in the tax year as well as the number of kilometres driven for business purposes. Also state whether the use data is based on a driver's log or other similar clarification.
Based on the details you enter, MyTax calculates the maximum amount of the additional deduction in total.
If you have deducted expenses related to a car that is a private asset in the business operation’s accounting, answer Yes to “Have you deducted the expenses in the accounts or the notes?” and enter the amount you have deducted.
Based on the details you enter, MyTax calculates the amount of the additional deduction.
Fill in the details required for the additional deduction in the tax return’s section 10, “Itemisation of private car use for business purposes”, as follows:
Include the additional deduction in the amount entered in section 2.3 at “Additional deductions”.
You may receive an additional deduction in tax assessment if you have made temporary business trips. A temporary business trip is a trip you have made outside your regular area of operation, such as a training trip, a trip to pick up goods or a temporary long-distance trip for selling products. If the business trip took place inside your company’s regular area of operation, you cannot get the additional deduction. Read more about deducting expenses related to business trips.
The maximum amount for the additional deduction is the same as the maximum daily allowance payable to wage earners. See the amounts in the Tax Administration decision.
If you have deducted your increased living expenses in accounting and the total amount of the expenses exceeds the maximum amount of additional deduction calculated according to the Tax Administration’s cost allowance decision, the actual costs will be deducted in the tax assessment. As a result, no additional deduction can be made, so do not fill in this column.
In this section, also report your spouse's additional deduction if you run the business together with your spouse.
Separate between different types of travel days:
Open the specification for the trip in question and fill in the following details:
MyTax calculates the amount of the additional deduction.
Fill in the following details in section 9:
Separate between different types of travel days:
Columns 2–6:
Column 2: Enter the number of travel days in the specifications.
Column 3: Enter the maximum deductions for domestic travel per travel day. See the amounts in the Tax Administration decision.
Column 4: Calculate the maximum amount of deduction for all travel days in total. To calculate the maximum amount of deduction for travel abroad, multiply the total travel days in each country by that country's foreign per diem allowance and add together the amounts of all the countries. See the amounts of foreign daily allowance per country in the Tax Administration’s cost allowance decision.
Column 5: On each line, enter the portion of the increased living expenses related to temporary business travel that you have deducted in accounting.
Column 6: Calculate and enter here the amount of additional deduction: subtract from the maximum amount the expenses that you have deducted in accounting. If you have not deducted any of the increased living expenses in accounting, enter here the same amount that you entered in column 4 (Total maximum amount).
Section 2.3, “Additional deductions”: Calculate the total amount of the additional deduction.
If you have privately used commodities that have been registered as business expenses, the private household’s share of the expenses must be filed as income.
If goods have been taken into private household use, enter the total amount of their original acquisition costs without VAT.
Report the portion attributable to private use of a business-related telephone, real estate unit, holiday home or boat. If you are using a real estate unit that belongs to the business operations for private purposes, report the portion of the expenses and depreciation that corresponds to the private use.
Example: 60% of a real estate unit owned by a private business operator is used as a workshop and 40% as the business operator's own dwelling. The interest expenses attributable to the real estate unit are €8,000. The depreciation for the building is €2,000. Other expenses relating to the building are €3,000 in total. The portion added to the company’s business income under 'other private use’ is €5,200, i.e. 40% of the total expenses (€13,000).
Do not report cash withdrawals in this section. Report them in the Background information stage in MyTax. If you are filing on paper, enter them in section 7 of the form.
Separate between
A company is listed if its securities are subject to trade on the stock exchange, for example.
The taxable portion of dividends received from a business source of income is determined by whether the dividends are distributed by a listed company or by a non-listed company.
MyTax calculates the taxable portion based on the details you enter.
Calculate and fill in these details in section 2.1 of the form.
At “Dividends from listed companies”, fill in only the taxable portion in euros.
At “Dividends from non-listed companies”, fill in only the taxable portion in euros.
Report surplus you have received from listed and non-listed cooperatives separately. A cooperative is publicly listed if its shares are subject to trade on the stock exchange, for example.
The taxable portion of the surplus is determined by whether the payor is a listed or non-listed cooperative.
25% of surplus from a non-listed cooperative is taxable business income and 75% is tax-exempt income, provided that the surplus amount is no more than €5,000 per year. If the surplus amount is more than that, 75% of the exceeding amount is treated as taxable business income and 25% as tax-exempt income.
In other words, surplus is taxed more leniently up to a total of €5,000. The €5,000 threshold is specific for the taxpayer and can be applied only once a year. If you are running a business with your spouse, you can use the remaining part of your spouse’s €5,000 tax relief in your business tax return.
If you have received surplus from multiple sources, see the instructions (in Finnish and Swedish, link to Finnish).
Surplus refunds, which are tax-deductible for cooperatives, are fully taxable income for the surplus recipient when the refunds relate to business activities.
The amount you have reported as taxable may change, because the Tax Administration checks the remission based on the available details and updates the figure, if necessary.
Report the surplus you have received from listed and non-listed cooperatives separately. MyTax calculates the taxable portion of the surplus received from listed cooperatives. Report the taxable portion of the surplus received from non-listed cooperatives yourself.
In this section, report income such as interest income from receivables and foreign exchange gains.
An operating reserve can be deducted in taxation if it has been recorded in the accounts. The maximum reserve is calculated yearly based on the wages that have been paid out during the 12-month period.
The total amount of operating reserves created in the tax year and unreleased operating reserves created in previous years may not exceed 30% of the wages subject to withholding that you have paid during the 12 months preceding the end of the accounting period.
Determine the operating reserve separately for each tax year. The operating reserve maximum may be exceeded if the amount of wages has decreased since the previous year. In that case, the exceeding part of the operating reserve made previously is taxable income for the tax year (decrease of reserves).
Report the amount of the operating reserve at the end of the preceding tax year and the operating reserve you made during the tax year.
At Total decrease of reserves to be entered as income, enter the calculated decrease of operating reserve and add to it any decreases of other reserves, such as unused replacement reserve recorded as revenue.
If you have made other reserves in addition to operating reserves
Specify all reserves on Form 62. You can find Form 62 in the Expenses stage, at the Depreciation section. Answer Yes to Have you made depreciation of other assets than movable fixed assets?
Enter the total decrease of reserves entered as income in section 2.1, line “Relieved write-offs and reserves”. If you have only made operating reserves, report the amount of the operating reserve in section 14.
If you have also made other reserves, itemise all the reserves on Form 62.
In this section, report all the taxable income that is not included in any other section. For example, your business operation may have received income from capital gains of fixed assets or from damages. Also report any taxable income that is not recorded in the profit and loss account for the accounting period as other taxable income.
In this section, report the total amount of tax-exempt revenues that are recorded in the profit and loss account.
Examples of tax-exempt revenues:
Do not include tax-exempt income in the income items reported in the calculation of taxable income.
In this section, report the acquisition costs of the goods sold during the accounting period.
To calculate the acquisition cost, adjust the amount of purchases in the accounting period with the inventory changes to finished and unfinished products.
Calculate the purchases and changes in inventory with the following formula:
Initial stock
+ purchases during the accounting period
- final inventory.
In this section, report any services, work and subcontracts which relate to your company’s regular operations and for which you hired an outside operator.
Itemise Wages, salaries and fringe benefits and Pension and other staff expenses.
Under Wages, salaries and fringe benefits, enter:
Note that you cannot deduct wages, pensions or other benefits that you have paid to your spouse or to a family member who was less than 14 years old at the beginning of the tax year.
Under Pension expenses and other staff expenses, enter:
Additionally, report wages from a period of 12 months under Wages subject to withholding paid during the 12 months preceding the end of the tax year. Based on the wages reported in this section, 30% of these wages is added to the net worth of the business, which means that they affect how the business income is divided into earned income and capital income. If you file on paper, you can find this section at the end of the form under section 15 Wages paid.
The price you paid for any item you buy for your business activity, with a useful life longer than 3 years, is tax-deductible in the form of depreciation.
For machinery and equipment bought in 2020 to 2025, there is a tax relief, i.e. an accelerated timetable of depreciation expensing. To benefit from the relief, you must have bought the machine or piece of equipment new, and have started using it for a business purpose during 2020 – 2025.
Depreciation calculations for movable fixed assets must be made in one whole, without itemising every piece of equipment in the calculation. Indicate the depreciation expense concerning movable fixed assets as it is recorded in your accounting books. Also indicate the start-of-the-year value of the assets.
The maximum amount that can be depreciated for tax purposes is the amount that has been recorded in the accounts for the current or previous tax years. In addition, the total amount of depreciation to be deducted may not exceed the maximum depreciation laid down in the Act on the taxation of business income (Laki elinkeinotulon verottamisesta, EVL (360/1968)).
More information about fixed assets and how their value is depreciated in taxation.
Select Yes under Depreciation expenses, if depreciation entries have been made in your accounting. If the only type of depreciation you are claiming this year is for moveable fixed assets – machines, equipment, etc. – an itemisation will appear in MyTax automatically.
You will see the confirmed remaining value at previous year’s end; this is often called the “undepreciated residual” value. MyTax calculates the maximum depreciation (25%) that companies are allowed to deduct per year, according to the Act on the taxation of business income. However, if the undepreciated remaining value is €1,200 or less, you can deduct the entire amount under “Depreciation for the tax year”. Enter the depreciation for the tax year and the additional depreciation in their respective fields. If you bought any moveable fixed assets or if you sold any during the accounting year, give details as appropriate.
Note that you must additionally fill in the Calculation of net worth, entering the undepreciated balance remaining at the end of tax year under Machinery and equipment.
If you claimed depreciation on your company’s moveable fixed assets on Form 62 the year before, MyTax will ask you to complete Form 62 this year, too. If you do not want to submit Form 62 any longer, you can delete the pre-filled amounts in MyTax and enter them under “Depreciation on the acquisition cost of movable fixed assets”.
Select Yes, as well, under Depreciation of other assets than movable fixed assets if depreciation entries have been made in your accounting concerning buildings, etc. or concerning new machinery/equipment (with accelerated tax-relief timetable for depreciation). In this case, you must complete Form 62 to provide details on all depreciation:
Open the specification and give the details needed:
The “undepreciated residual cost” value means the price paid for the fixed assets minus the claimed depreciations for all preceding years. MyTax displays the undepreciated value, which the Tax Administration confirmed in last year’s tax assessment. This makes it easier to submit the tax return for the year. If you bought or sold any fixed assets during the year, give details as appropriate. MyTax performs calculations automatically and displays a suggestion for maximum depreciation claim under the law. However, the tax relief available for new machinery and equipment is not included in the suggestion.
Scroll the lines of Form 62 up or down to locate the right place for the type of assets for which you claim depreciation.
Example: You bought a new machine for €10,000. Enter the depreciation in the fields in the following way:
The Movable fixed assets field:
Additions: 10,000
Normal depreciation: 2,500
Additional depreciation and tax-relief depreciation: 2,500
The Specification of tax-relief depreciation field:
Investments in machinery and equipment during the tax year: 10,000
Depreciation on the tax year’s investments in machinery and equipment: 5,000
Note that you must additionally fill in the Calculation of net worth, and enter the undepreciated balance remaining at the end of tax year.
Itemization of reserves, revaluations and depreciation of fixed assets (Form 62)
In this section, report any depreciation from previous years that has not been deducted in your tax assessment (unused depreciation) and that you want to deduct in the tax year.
Select Yes and open the specification (Form 12A).
On Form 12A (Deferred depreciation)
Entertainment expenses are such expenses recorded in the accounts that have arisen from promoting business activities by entertaining clients and partners.
Enter the total amount of entertainment expenses as recorded in the accounts.
You can deduct 50% of entertainment expenses.
Enter the total amount. MyTax calculates the deductible portion of entertainment expenses.
Calculate the deductible portion yourself and fill it in on the tax return form.
In this section, report the total amount of business-related rental expenses according to the accounting. Expenses can arise from renting facilities and equipment, for example.
In this section, report the amount of interest expenses related to the business operation deducted in the accounts as well as the tax-deductible amount.
If you use single-entry bookkeeping, enter here the interest expenses for loans relating to business operations that you have deducted in accounting.
If you use double-entry bookkeeping, calculate the deductible amount by subtracting any non-deductible interest expenses from the total amount of all interest expenses. The amount of non-deductible interest expenses can never be higher than the interest expenses in total.
Do not include surtax, penalty interest, late-filing penalties, or any late-payment interest or late-payment interest with relief related to taxes. These expenses are not tax-deductible.
Calculate the amount in MyTax in the Background stage, at “Calculation of interest expenses that are not deductible as business expenses”.
In this section, report other financial expenses as recorded in the accounting. Examples of other financial expenses:
In this section, report other deductible business expenses that are included in the profit and loss account for the accounting period but that are not reported as business expenses elsewhere in the calculation of taxable income. Such expenses include travel expenses, vehicle expenses, leasing fees as well as small acquisitions and accounting expenses.
Note: Do not report any additional deductions for travel and vehicle expenses in this section. Read the section “Use of a private car for business-related driving” of the instructions to see how to make an additional deduction on the basis of car expenses, and the section “Increased living expenses due to temporary business trips” to see how to make an additional deduction on the basis of a temporary business trip.
You can also report expenses related to a phone or computer in this section. Read more about whether you can deduct the purchase price as a one-time expense or depreciation.
If your increases to reserves are higher than the decreases to reserves during the tax year, report the net increase.
MyTax shows an increase to the operating reserve from the Background stage. If you have not made any other reserves, report the same amount under Increases of reserves.
If you have made other reserves than the operating reserve, such as a replacement reserve, enter the total amount of all the Increases to reserves and itemise the reserves on Form 62.
In MyTax, you can find Form 62 in the Expenses stage, under Depreciations. Select Yes at Have you made depreciation of other assets than movable fixed assets?
You may be entitled to additional deductions based on the use of a private car or increased living expenses caused by temporary business trips.
Information on additional deductions is based on the specifications you enter in the Revenues stage.
If you are entitled to raised kilometre allowances, enter them in the field “Raised kilometre allowances”.
MyTax will add the amounts together automatically.
Itemise the additional deductions in sections 9 and 10 of the tax return. Add together the amount entered in line Total in section 9, column 6 (Additional deduction) and the amount entered in section 10, column 7 (Additional deduction). Enter the total amount of the additional deductions in Additional deductions in section 2.3 of the tax return.
All business-related tax-deductible expenses that are not included in the profit and loss account for the accounting period are reported in this section. The expenses in this category include
temporary or combined deductions for research and development.
Open the specification to report a workspace deduction or the expenses that you are deducting for the use of a private dwelling for business purposes. Select the actual expenses or the workspace deduction. Answer the additional questions. Please note that MyTax calculates the amount of the workplace deduction automatically based on the answers you give.
If you claim a temporary additional deduction for research and development, open form 67A in MyTax.
If you claim a combined deduction for research and development, open the form 67Y in MyTax.
MyTax calculates the amount of the other deductible expenses.
If you have not deducted the expenses in the profit and loss account, report them in section 2.3, subsection “Deductible expenses not entered in the accounts”. Report either a workspace deduction or a business-related portion of the actual costs of using your own residence for business purposes.
If the expenses have been entered in the accounts, report them in section 2.3, subsection “Other deductible expenses”.
In addition, itemise the expenses in section 8 “Itemisation of use of private residence for business purposes”.
Report the additional deduction for research and development: Form 67A or form 67Y.
Calculate the total amount of deductible expenses not recorded in the accounts and report it under “Other deductible expenses not recorded in the accounts”.
Read more:
The items deducted in accounting that are not tax-deductible are reported here as non-deductible expenses. These items may not be included in the deductible expense items reported in the calculation of taxable income.
Direct taxes are the difference between the income taxes paid and the tax refunds received.
If the business operation has a real estate unit in its use, enter the real estate tax in business expenses at Other deductible expenses.
Fines, penalty fees and the like cannot be deducted from business income.
For example, a punitive tax increase, surtax, penalty interest and late-payment interest are not tax-deductible, whatever the tax they relate to.
Other expenses recorded in the accounts that are not deductible from business income.
They include, for example, voluntary pension insurance contributions paid by an entrepreneur or their spouse. You can deduct them in the individual taxpayer’s pre-completed tax return.
Report here mandatory YEL pension insurance contributions if they have been recorded in the accounts but have not been deducted as business expenses and you want them to be deducted on your pre-completed tax return or on your spouse’s tax return.
Enter here depreciation on shares included in fixed assets, because they are not tax-deductible. Only depreciation on securities other than shares and on fixed assets other than land is deductible when the fair market value of those assets is substantially lower than the undepreciated acquisition cost at the end of the tax year (§ 42, act on the taxation of business income (Laki elinkeinotulon verottamisesta 360/1968)).
Do not enter here expenses that have been entered in “Private use entered as income” in the Revenues section.
A negative result for the tax year can either be recognised as business loss or deducted in part or in full from the capital income of the self-employed person.
If spouses run the business together, a request for the deduction of loss from capital income is deemed to be a joint request.
If the tax year’s business profit is negative, the section Deduction for loss from capital income is shown in MyTax.
If you select No at Deduction for loss from capital income, the Tax Administration will deduct the allowable loss from the business income over the next 10 tax years as income accrues.
If you select Yes at Deduction for loss from capital income, the loss or part of it is deducted from capital income. Enter the amount of loss in euros that you want to be deducted.
Also enter your spouse’s share of work in the business in the Background section under Division of business income between spouses. Enter the information in percentages.
If you want the Tax Administration to treat the tax year’s negative result as a business loss, do not fill in section 3 of the tax return. The Tax Administration will then deduct the allowable loss from the business income over the next 10 tax years as income accrues.
If you want the Tax Administration to treat the loss or part of the loss as a deduction from capital income, report the amount in euros that you want to be deducted in the tax return’s section 3.
The Tax Administration divides the allowable loss deducible from capital income between the spouses on the basis of their percentage shares of work. Report the shares of work under “Working at point of service” in section 4 “Division of business income between spouses”. Enter the information in percentages. If you provide no percentages concerning the work efforts, the Tax Administration will use 50-50 percentages for dividing the deductible loss.
Read more about how losses can be deducted(available in Finnish and Swedish, link to Finnish).
Report details on assets based on the data for the accounting period that ended last. Use the undepreciated acquisition cost of the assets when you enter them in the calculation. Exceptions are separately specified in these instructions.
Specify the details on real estate units, buildings and structures included in fixed business assets on Form 18B. A real estate unit comprises a land area and the buildings located on it. Real estate also refers to a building, structure or other facility that is located on another owner's land and that can be handed over to a third party without consulting the landowner so that the right of possession to the land is also transferred (§6, act on income tax (Tuloverolaki 1535/1992)). For each real estate unit, report both the undepreciated acquisition cost and the unit’s comparison value (the comparison value is the taxable value for the tax year whose end date is used in the calculation of net worth). The comparison is made separately for each real estate unit, and the higher of the two values is used in the calculation of net worth.
Click Open specification to report the real estate units, buildings and structures included in the business operation’s fixed assets. MyTax automatically selects the highest available value for each real estate unit and calculates their total value.
Transfer the total value of real estate units from Form 18B to line “Real estate, buildings and structures” in section 12.1 “Business assets” on the tax return.
Report here the value of the machinery and equipment intended for permanent business use. The value of the machinery and equipment is the part of the acquisition cost that is not depreciated in income taxation.
If you have filled in Form 62 on movable fixed assets in the Expenses stage, the value of machinery and equipment is automatically transferred to the “Movable fixed assets” field. In this case, enter the same figure at “Machinery and equipment”.
Report the value of commodities included in other fixed assets. Other fixed assets include gravel and sand pits, ore and mineral deposits, quarries, peat bogs, railways, dams, bridges and reservoirs.
Enter the value of goods included in the business assets and the value of other current assets separately.
Goods are commodities purchased from an external supplier, intended for selling. If you are engaged in wholesale trade or retail trade, also add the packaging materials acquired for the purpose of selling the goods.
Other current assets include materials, supplies and self-manufactured products.
Specify securities included in fixed assets and financial assets on Form 8B. Report the quantity of securities included in the business operation for each security that you own. In addition, report both the undepreciated acquisition cost for purposes of income tax and the security-specific comparison value for each asset.
The comparison value of a listed security is 70% of the last trading price on the financial statement date of the business operator or self-employed individual. The comparison value of a mutual fund share is 70% of the fair market value at the end of the tax year. The comparison value of a non-listed share is the taxable value given in the tax decision of the company in question. The taxation value for 2005 is used as the comparison value for housing-company shares acquired before 1 January 2006. Housing company shares acquired on or after 1 January 2006 do not have any comparison value, which means that the acquisition cost not depreciated for income tax purposes must also be entered in the “Comparison value” column.
Based on the details you enter, MyTax automatically calculates the value used in the calculation of net worth.
Use Form 8B to compare which amount is greater: the total undepreciated acquisition cost of securities included in fixed assets and financial assets, or their total comparison value. Compare the amounts entered on the final line of Form 8B (Fixed assets and financial assets in total).
If the total undepreciated acquisition cost is greater, copy the sum total of undepreciated acquisition costs from the line “Käyttöomaisuus yhteensä” (fixed assets in total) of Form 8B to the tax return’s section 12.1, subsection “Fixed assets”, line “Fixed-asset securities”, and also copy the sum total of undepreciated acquisition costs from the line “Rahoitusomaisuus yhteensä” (financial assets in total) of Form 8B to the tax return’s section 12.1, subsection “Financial assets”, line “Financial-asset securities”. If the total comparison value is greater than the total undepreciated acquisition cost, enter the sum total of the comparison values on the same line.
Enter accounts receivable, cash-in-hand and other financial assets separately.
Accounts receivable include current and non-current accounts receivable and instalment accounts receivable. Cash-in-hand includes the cash assets of a business operator or self-employed person. Other financial assets include business-related receivables that are not based on sales of goods or services, for example.
Do not include bank deposits in the financial assets of the business operation. Interest income that accrues on a bank account is not taxed under the act on income tax, but under the act on tax at source, which is why the bank account capital is not included in the business assets either.
Report details on liabilities based on the data for the accounting period that ended last.
Report both current and non-current liabilities. A liability is regarded as current (short-term) if it is due for payment within a year or less. A liability is regarded as non-current (long-term) if it is due for payment after a year or more.
Calculated tax liabilities under the Accounting Act (chapter 5, § 18) are not regarded as liabilities in the calculation of net worth.
The information on adjusted negative equity will be transferred to this section from the specification entered in the Background stage. If the amount is the same as or higher than the total amount of current and non-current liabilities, the amount of business liabilities is 0.
In section 12.2., fill in the amount of adjusted negative equity that you calculated in section 11 (Calculation of non-deductible interest expenses) of the tax return. However, please note that this amount must not exceed the business operation’s total debt. At “Total business liabilities”, add together the current and non-current liabilities and subtract from the result the amount of adjusted negative equity.
In this section, report the capital gains that you have received from securities and real estate included in fixed assets. Capital gain means the positive difference between the selling price and the undepreciated acquisition cost. Add the amount of capital gains to the revenues that you report in the “Revenues” section of the tax return.
You must provide a separate account of these capital gains, because the minimum amount deemed as capital income is equivalent to the amount of capital gains on fixed-asset real estate and securities. However, do not enter here the portion of capital gains from which a replacement reserve has been created.
Business income is capital income up to the amount corresponding to a 20% annual return on the net worth of the business in the previous tax year.
You can also request an alternative way of dividing business income:
You can only request one or the other. From a tax assessment perspective, the best option depends on the earned income of both the business operator and their spouse and the deductions made from the income.
If spouses operate the business together, the request on the division of business income is considered a joint request.
Please provide information in greater detail if you claim credit for taxes paid abroad, if you have a permanent establishment abroad or if you have received income in the form of profit-shares from a CFC.
If you demand that the provisions of a relevant tax treaty be applied on your tax assessment for the year, provide a written account in free text describing your operations and activities. Explain the reasons why you believe that Finland lacks the taxing rights with respect to the business you conduct in Finland.
If you answer Yes to the questions above, open the specification and fill in the required details.
The line of business is indicated on the tax return in accordance with the Standard Industry Classification of Statistics Finland.
Select the Taxpayer details tab on the home page and go to the Business operations section. Click the Change line of business button. When you change the line of business in MyTax, the information will also be transmitted to the Business Information System.
If your account number has changed or if you have not yet submitted it to the Tax Administration, add your up-to-date account number in MyTax under the Taxpayer details section.
You do not need to claim the deduction for entrepreneurs separately on your tax return; the Tax Administration calculates it for you.
Read more about the deduction for entrepreneurs (only in Finnish and Swedish).
The deadline for the business tax return is 1 April 2026.
You should also check your personal pre-completed tax return and add any missing information or make corrections if necessary. The due date for the personal return is 1 April 2026 as well. If you have a spouse, this due date will concern both you and your spouse. You can check due dates for tax returns in MyTax and on the return’s first page.
You may ask for an extension of time for filing the tax return if you have a valid reason for it, for example if you get ill. Log in to MyTax to complete the application for extension of time.
Do you live outside Finland and operate a trade or business?
You must file the Business tax return (Form 5) for every year – even if you have not had any business activities.
In MyTax there is both in the Income stage and in the Expenses and reserves stage a box which you can tick if you had no business activities. The box is right at the top of the page. Tick the box: I am not filing details in the Income stage and I am not filing details in the Expenses and reserves stage.
If you send it after the date when it is due, you will have to pay a late-filing penalty fee.
If you do not submit your return at all or if you submit an incomplete return, you may have to pay a punitive tax increase.
Read more about the basis and amount of the late-filing penalty and punitive tax increase.
If you have filed your tax return on paper or through some other electronic service than MyTax, the details you have given will be displayed in MyTax later. If you can see a notice of a missing tax return in MyTax, but you have sent the return on paper or through another e-service, you can disregard the notice. When your tax return has arrived, MyTax will no longer show the notice.
In MyTax, you can use the previous return as a template for a new return, so you do not need to enter all details again.
Start by finding the tax return you have filed:
Where to find the earlier years tax return
If, instead of completing the tax return yourself, you want to give an authorisation to an accounting firm (or other agent or representative) for dealing with your taxes, you can do so on the suomi.fi/e-authorizations website. The accounting firm or representative using MyTax on your behalf would need to have the authorisation “Managing tax matters”.
Read more about the scope of the authorisations and their use in different e-services
Besides MyTax, you can send your business tax return:
The form (5) is available for printing on the Forms page
You can also get the form and the return envelope by calling our telephone service at 029 497 030 (standard call rates). If you order the forms by phone, make sure to allow enough time for postal delivery. The paper forms must arrive at the Tax Administration on the deadline date at the latest.
Instructions:
If you file the tax return and its enclosures on paper:
The headings and order of the sections on the form are different from these instructions.
Extended time for filing
You may ask for an extension of time for filing the tax return if you have a valid reason for it, for example if you get ill. Complete an application form and send it before the deadline date of the return. Print it out on paper, fill it out, and send it to the Tax Administration.
Changing the line of business
The line of business is indicated on the tax return in accordance with the Standard Industry Classification of Statistics Finland.
How to make corrections on a paper form
Submit a notification of change with paper form Y6. The form is available at ytj.fi.
How to make corrections using a paper form
If you are correcting a tax return you have previously submitted, please send an entirely new return to replace the original one. Re-submit all the details you filed before. It is not enough to only fix an incorrect detail or to add a new one.