The Tax Administration can use automated decision-making in the context of resolving tax matters. This means that a decision concerning your tax matter may be based on partial or full use of an automated decision-making system. Read more about automated decision-making at the Tax Administration (only in Finnish).
Year of tax return
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1
You will receive your tax return in March
We collect information that affects your taxation from your previous year's tax card and from employers, pension institutions and banks, for example. Based on this information, we create a pre-completed tax return for you and send it to you in March.
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2
Check the information and make corrections
Check the information on the tax return. If all the information is correct, you do not need to do anything.
If you make corrections, the filing deadline is 1, 15, 22 or 29 April. You can check the due date on your tax return and in MyTax. The corrections you have made to your tax return in MyTax or on paper forms must arrive at the tax administration by the due date stated in your return, at 23.59.
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3
A tax refund or back taxes?
Based on your pre-completed tax return and the corrections you have made to it, the Tax Administration will calculate the total amount of taxes and charges. If your tax rate has been too high, you have paid too much tax and will get a tax refund. If your tax rate has been too low, you will have to pay back taxes.
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4
A tax decision is a calculation of taxes
If you did not make any changes to your pre-completed tax return, the tax decision and payment details you received in the spring will remain in force.
If you make corrections to your tax return, you will receive a new tax decision by the end of October. In that case, the payment date of your tax refund or the due dates of your back taxes may change. The payment dates may also change if your spouse makes corrections to their tax return.
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. Complete an application form and submit it to the tax administration before the deadline date of the tax return.
Log in to MyTax to complete the extension form, or print it out on paper (Application for extension of time to submit tax return), fill it out, and send it to the tax administration.
Page last updated 5/12/2025