When you log in to MyTax, your tax-related letters will change from paper to electronic form automatically. Read more about the changes.
Individual taxpayers, self-employed operators of a trade or business and for agricultural and forestry operators can use this form to submit a claim for adjustment of preassessment after they have requested and received an appealable decision from the Tax Administration. The claim can be filed in MyTax, on a paper form or by submitting a free-form written request.
Choose your filing method
Claim for adjustment in MyTax.
Enclose photocopies of the documents you refer to unless you have already submitted them to the Tax Administration.
If you want us to send the decision to your authorised representative, please say so in your claim for adjustment and enter the representative’s address as the address for correspondence.
You can find the return address on the first page of the form.
Download the form
If you file a free-form claim for adjustment, make sure to state
- the appellant’s name and personal ID
- the tax year that the claim for adjustment concerns
- the decision to be adjusted
- the sections of the decision that the claim concerns and how you think they should be adjusted
- the grounds for claiming adjustment.
Enclose photocopies of the documents you refer to unless you have already submitted them to the Tax Administration.
If you want us to send the decision to your authorised representative, please say so in your claim for adjustment and enter the representative’s address as the address for correspondence.
Instructions for submitting tax returns on paper
Send the claim for adjustment to:
Finnish Tax Administration
P.O. Box 650
FI-00052 VERO
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The online authorisation mandate
You can use the feature called “Suomi.fi Authorization” to enable you to deal with another person’s taxes through e-services, over the telephone, or by visiting a service point on their behalf.
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Letters of authorisation on paper
You can receive a letter of authorisation from the other person. It will enable you to deal with that person’s taxes on the telephone, by visiting a service point on their behalf, or by submitting information on paper tax forms. To have a letter of authorisation (often called a ‘power of attorney’) does not provide access to MyTax.
Letter of authorisation for tax representation of individual taxpayers
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When is there no need for an authorisation mandate?
The following circumstances are examples of when you can deal with someone else’s taxes with no authorisation.
You have child younger than 18 and you handle the child’s taxes
You are automatically authorised to access MyTax for the child, without an authorisation. Log in to MyTax and select “Act on behalf of someone else”.
Read more about this subject on Suomi.fi.
You are a guardian
You do not need a Suomi.fi authorisation when your continuing power of attorney for being a guardian is officially confirmed, or when you are registered as a private guardian. Log in to MyTax and select “Act on behalf of someone else”.
Note: If you are a public guardian, in other words, a public official employed by a public guardianship office, you can only use paper forms.
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Key terms:
Page last updated 6/23/2026