Interest calculator

You can use this calculator to determine the late-payment charges that are imposed for different taxes if you pay them late.

You can calculate late-payment interest for the following tax types:

  • self-assessed taxes
  • inheritance tax
  • gift tax
  • income tax
  • real estate tax
  • transfer tax.

You can also use the calculator to determine the penalty interest and surtax for car tax and excise duties.

You must enter the amount of tax due, its due date, and date when you made the payment. If you are not sure what information you should enter in any of the fields, click on the “i” symbol next to the field for more information. The details you enter will not be saved in the calculator or in the Tax Administration’s records. You can also calculate late-payment interest when you are paying your taxes in MyTax.

If you pay self-assessed taxes (such as employer's contributions or value-added tax), income tax (such as prepayments or back taxes), inheritance tax, gift tax, real estate tax or transfer tax after the due date, you will have to pay late-payment interest. Late-payment interest is imposed on the tax as well as on all related charges, such as late-payment charges or punitive tax increase.

Please note: The calculation process for interest on real estate tax and transfer tax has changed on 1 November 2019. The result given by the interest calculator may differ from the balance in MyTax, because we impose penalty interest and surtax on real estate tax and transfer tax until 31 October 2019. As of 1 November 2019, late-payment interest is imposed instead.

If you pay car tax after the due date, you will have to pay penalty interest.  If you pay excise duties after the due date, you will have to pay surtax. If you pay excise duties after the reassessment due date, you will also have to pay penalty interest. Penalty interest is imposed on the tax and all related charges, such as punitive tax increase. Because surtax is calculated with the same interest rate and interest days as penalty interest, select the option “penalty interest or surtax”.

Interest days are always counted from the day following the due date up to and including the payment date. The interest rate for late-payment interest is the reference rate stated in § 12 of the Interest Act plus 7 percentage points. Late-payment interest is imposed according to actual calendar days. Late-payment interest has no minimum amount.

The interest rate for penalty interest and surtax is determined in the same way as for late-payment interest. However, when calculating the interest period for penalty interest or surtax, the number of interest days is considered to be 30 days per month and 360 days per year. The minimum amount for both is €3.

Table: Interest rates in different years

Viivekoron ja veronlisäyksen korkoprosentti vuosina 2013-2020
Korkojakso Korkoprosentti
2020 7
2019 7
2018 7
2017 7
2016 7,5
2015 7,5
2014 7,5
2013 8

Late-payment interest

The number of interest days is the actual number of days in the calendar month or year. For example, September has 30 interest days, and October has 31. There are 365 interest days in a year, or 366 in a leap year. The years 2017–2019 have 365 interest days each, but 2020 has 366.

The amount of late-payment interest is calculated with the following formula: (interest days × interest rate × amount of tax) / 365 (or 366) × 100%

Late-payment interest is calculated in euros and cents.

Penalty interest and surtax

For penalty interest and surtax, the number of interest days is always 360 per year and 30 per month.

Penalty interest and surtax are calculated with the following formula: (interest days × interest rate × amount of tax) / 360 × 100%

The minimum amount for both is €3. If the result of the calculation is less than €3, the amount payable would still be the minimum amount of €3.