Learn › Filing your tax return in Finland

In short: For most people in Finland, filing means logging in to OmaVero (MyTax), checking the pre-filled return the Tax Administration already prepared, and only making changes if something is wrong or missing. If the pre-filled data is correct, no action is needed. Corrections for spring 2026 are due on your personal deadline, which is 1, 14, 21 or 28 April 2026 as printed on your return and shown in OmaVero.

Filing your tax return in Finland

Kontoo editorial team · Updated 06/24/2026

In Finland you usually do not start your tax return from a blank page. The Tax Administration (Verohallinto) prepares a pre-filled return, the esitäytetty veroilmoitus, using data it already holds from employers, banks and benefit providers. Your job is mainly to check it and correct anything that is wrong or missing. This lesson explains how the process flows through OmaVero (MyTax) and the key spring deadlines, using facts current as of 2026.

  • Wait for your pre-filled return. The Tax Administration publishes the esitäytetty veroilmoitus in OmaVero (MyTax) by the end of March 2026. You are notified, and a paper copy may also arrive by post.
  • Log in to OmaVero and read every section: income, withheld tax, deductions, and any benefits. Compare it against your own records such as payslips and bank statements.
  • If everything is correct, you do nothing. The pre-filled return stands as filed and the spring tax decision that came with it remains valid.
  • If something is wrong or missing, add or correct it in OmaVero before your personal due date, then submit. You receive a new tax decision later in the year.

What matters

Finland’s system is built around the pre-filled return, the esitäytetty veroilmoitus. Throughout the year, employers, pension and benefit payers, banks and other parties report your income and withheld tax directly to the Tax Administration (Verohallinto). In spring the authority assembles this into a draft return and delivers it to you, by the end of March 2026, through the OmaVero (MyTax) online service. A paper version may also arrive by post. The core idea is checking, not building. You open OmaVero, review your income, the tax already withheld, your deductions and any benefits, and compare it with your own documents. If the data is accurate, you do nothing and the process is finished for you. The spring tax decision that arrives with the pre-filled return then remains in force. If something is missing or incorrect, for example a deduction you are entitled to, rental or investment income that was not reported, or a job-related expense, you add or correct it in OmaVero and submit. Each person has a personal due date, one of 1, 14, 21 or 28 April 2026, shown on the return and in OmaVero. Corrections made online must reach the Tax Administration by 23:59 on that date; corrections sent on paper forms must arrive by 16:15. After you submit changes, the Tax Administration reassesses and sends a new tax decision, generally by the end of October 2026. This lesson is educational and not personal tax advice. Deadlines, deduction rules and payment dates can change, so confirm your own situation on vero.fi/en and in OmaVero.

ExampleWorked example, rounded, in euros (EUR), the currency used in Finland. Suppose your pre-filled return shows annual salary of 40,000 EUR with 9,000 EUR of tax already withheld. You notice it is missing a deductible expense for commuting and work equipment worth 1,500 EUR. You add the 1,500 EUR deduction in OmaVero before your April deadline. Your taxable income falls to about 38,500 EUR. If your effective tax rate on that band is roughly 24%, the deduction lowers your tax by about 0.24 x 1,500 = 360 EUR. Since 9,000 EUR was already withheld, you would expect a refund of roughly 360 EUR more than the original assessment, confirmed in your new tax decision. Figures are illustrative; your real rate and result depend on your full circumstances.
Use the Kontoo deductions and refund tracker to keep payslips, work-travel costs and other deductible items in one place during the year, so checking your esitäytetty veroilmoitus takes minutes. Always confirm your personal due date and figures on the official portal, vero.fi/en and OmaVero (vero.fi/omavero).

In depth

OmaVero (MyTax) is the hub

Almost everything happens in OmaVero at vero.fi/omavero: viewing the pre-filled return, making corrections, seeing your personal deadline, checking refund or back-tax dates, and later reading your new tax decision. You log in with strong electronic identification, such as online banking credentials.

Corrections and reassessment

When you change your return, the Tax Administration reassesses and issues a new tax decision, generally by the end of October 2026. This can shift your refund date or back-tax instalment dates. If you later discover an error after assessment ends, you can still file a separate claim for adjustment within the statutory period described on vero.fi.

Checklist

  • The pre-filled return (esitäytetty veroilmoitus) appears in OmaVero by the end of March 2026.
  • If every figure is correct, you do not need to file anything.
  • Your personal correction deadline is 1, 14, 21 or 28 April 2026, shown on the return and in OmaVero.
  • Online corrections are due by 23:59 on your date; corrections lead to a new tax decision by the end of October.

Common myths

Myth: In Finland you have to fill in your tax return from scratch every year.

Reality: No. The Tax Administration sends a pre-filled return based on data it already collected. For many people checking it and doing nothing is the whole process; you only edit it when something is wrong or missing.

Myth: If I ignore the pre-filled return entirely, I am always safe.

Reality: Only if it is genuinely correct. If income is missing or a deduction is wrong, you are responsible for adding or correcting it by your April deadline. Failing to report income can lead to back taxes and consequences, so always review it.

Sources

Frequently asked questions

What if the pre-filled return is completely correct?

Then you do not have to do anything. As of 2026, if every figure on your esitäytetty veroilmoitus is right, the return is treated as filed and the tax decision delivered with it stays valid. You only act when there is something to add or correct.

What is my exact correction deadline?

It is one of four spring dates: 1, 14, 21 or 28 April 2026. The Tax Administration assigns you a personal date, which is printed on the first page of your pre-filled return and shown in OmaVero. Online corrections must arrive by 23:59 on that date; paper forms by 16:15. Check vero.fi when in doubt.

When do I get a refund or pay back taxes?

As of 2026, most refunds are paid around 3 August or 3 September 2026. If you owe back taxes (residual tax), instalments are typically due 3 August and 1 October 2026. Making corrections can change these dates, and you would then receive a new tax decision by the end of October. Verify your own dates in OmaVero.

Related lessons

Income tax in FinlandPensions and saving in FinlandBuying a home in Finland

All lessons · Glossary · Editorial · Kontoo does the math and explains – this is general education, not tax, legal or financial advice.

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