Information on MyTax

MyTax is the Tax Administration’s e-service for taxpayers. You can take care of most of your tax matters in MyTax.

Individuals and companies: Instructions for MyTax

Corporate taxpayers: Instructions for MyTax

In MyTax, you can:

  • request a tax card or prepayments
  • file a personal tax return or corporate tax return
  • read your tax data
  • pay taxes or check the bank details for making payments
  • See the amount of your tax refund
  • Ask for a payment arrangement to be made for you
  • Ask for a tax debt certificate
  • make a claim for adjustment
  • submit a bank account number.

More features will be introduced in the next few years. In future, you will also be able to:

Log in with your online banking codes or Katso ID

You can log in to MyTax with your online banking codes, electronic ID card or mobile ID, if you are:

  • a private individuala business operator or a self-employed individual
  • an operator of agriculture or forestry
  • the representative of a limited liability company, housing company, cooperative society, general partnership, limited partnership or association and you have an authorisation recorded in the Trade Register that entitles you to use MyTax on their behalf.

The following taxpayer groups can log in with a Katso ID or with personal online banking codes, an electronic ID card or a mobile ID:

  • companies (limited liability companies, housing companies and real estate holding companies)
  • foundations and associations registered in the Trade Register.

The following taxpayer groups can log in with a Katso ID:

  • companies (limited liability companies, housing companies and real estate holding companies)
  • foundations and associations public organisations (such as municipalities and parishes)
  • partnerships (such as agricultural, forestry and business partnerships)
  • estates with a Business ID
  • joint-benefit administrations
  • foreign citizens and companies.

If you use the service on behalf of someone else, you will need a Suomi.fi authorisation or a Katso ID. Read more about authorisations.

MyTax uses the Suomi.fi authorisation service. Suomi.fi authorisations enable Single Sign-On to all the e-services of public organisations in which the authorisations are in use. In other words, you can move from MyTax directly to Suomi.fi Messages, for example, without having to log in again.

Suomi.fi authorisations and their contents

This authorisation allows the authorised person to manage all the tax matters of the authorising party and to access their tax details.

  • Organisation’s tax matters.
  • Self-employed individual’s tax matters, both personal and business-related.
  • An individual taxpayer’s personal tax matters.

The authorisation is extensive in scope and enables the authorised person to attend to practically all the tax matters of the authorising party that they themselves could attend to in the Tax Administration’s service channels. The authorisation is valid at tax offices, in the telephone service, in MyTax and in Ilmoitin.fi and Lomake.fi. It also covers any future service channels.

This authorisation may be used by all:

  • Individual taxpayers
  • Self-employed individuals
  • Companies and cooperative societies (the right to sign for the entity recorded in the Trade Register).

This authorisation allows the authorised party, such as an accounting firm or a company’s employee, to manage all the company’s tax matters, or a person can authorise another person to attend to the tax matters.

Self-employed individuals should take into account that for example an accounting firm with an authorisation is entitled to see and attend to the self-employed individual’s personal tax matters as well. The authorised party also has access to letters and decisions.

For example income tax and inheritance and gift tax details can be read in MyTax. Advance rulings and claims for adjustment relating to income tax, and decisions made on them are also available in MyTax. In addition, decisions on claims for adjustment made by the Tax Administration and the Adjustment Board are accessible to the authorised party.

Further, MyTax contains tax audit reports on business activities, advance ruling decisions made in MyTax and decisions on claims for adjustment made by the Tax Administration and the Adjustment Board. Inside information according to the EU regulation on market abuse is not available in MyTax.

Please note that if a self-employed individual authorises another person to act on their behalf using their Business ID, the authorised person cannot change the authorising party’s bank account number in MyTax. If a self-employed individual grants an authorisation using their personal ID, however, the authorised person can change the authorising party’s bank account number in MyTax.

This authorisation allows the authorised person only to file tax returns and other tax-related reports on behalf of the authorising party.

The authorisation allows the authorised person to file in the following channels: Lomake.fi and Ilmoitin.fi. Please note that the authorisation does not entitle the authorised person to log in to MyTax, where the authorising party’s tax details are always accessible.

Katso roles and authorisations

This role is intended for an employee or an accountant that manages the tax matters of a business operator, a self-employed individual, an agricultural operator or a forestry operator. The role allows you to view, correct or submit information both on the company’s business operations and on the authorising party’s personal tax matters.

If you are managing affairs on behalf of a self-employed individual, you can use all MyTax features and read all the information available there.

For example, you can:

  • make a tax card or request prepayments
  • submit a bank account number
  • file tax returns.

This role is for a person who has the right to sign for the company. If you are managing affairs on behalf of a corporation, you can use all MyTax features, view all the information available in MyTax and submit a new or changed bank account number.

You can read letters published in MyTax about taxpayer registration, tax audits and payments. You will also receive emails whenever reminders about overdue payments arrive in MyTax or when you have new messages and letters waiting in MyTax.

This role is for a person who manages authorisations in the Katso service in addition to the Master User.

If you are managing affairs on behalf of a corporation, you can use all MyTax features, view all the information available in MyTax and submit a new or changed bank account number.

You can read letters published in MyTax about taxpayer registration, tax audits and payments. You will also receive emails whenever reminders about overdue payments arrive in MyTax or when you have new messages and letters waiting in MyTax.

This role is for an employee or an accountant who manages the company’s tax affairs.

If you are managing affairs on behalf of a corporation, you can use all MyTax features, view all the information available in MyTax and submit a new or changed bank account number.

You can read letters published in MyTax about taxpayer registration, tax audits and payments. You will also receive emails whenever reminders about overdue payments arrive in MyTax or when you have new messages and letters waiting in MyTax.

Videos and instructions

On the MyTax login page you can find videos and instructions for making a tax card, filing a tax return and paying taxes. After logging in, click on an instruction icon to get help.

MyTax and taxpayer services

If you request our assistance with using the service, our taxpayer service agents can view your information in MyTax. This way they will be able to guide you. Unfinished information will not be used in your tax assessment. Your activities in MyTax will be recorded. We may use the recording, if necessary, when we

  • investigate errors or problems in the service 
  • improve service quality.

Recordings are destroyed after 30 days.

Documents are kept in MyTax for as long as they are needed for taxation purposes. If you need documents for other purposes, save them on your computer or archive them in some other way.

Non-disclosure for personal safety: Your information covered by non-disclosure for personal safety is available in MyTax to you and a person you have authorised to manage your taxes At the Tax Administration, only named employees have access to information covered by non-disclosure. However, please note that in exceptional situations a taxpayer service agent may see your contact details from a recording made of your activities in MyTax. Taxpayer service agents are Tax Administration personnel and bound by confidentiality.