When you log in to MyTax, your tax-related letters will change from paper to electronic form automatically. Read more about the changes.
Report information related to capital income, such as:
- Dividends and co-operative surplus received
- Receipts of pensions treated as capital income
- Payments you have made into a long-term savings account (PS)
- Interest expenses relating to a home loan or a loan relating to the production of income, premiums of a voluntary pension insurance contract you have paid
- Amounts and information relating to assets or wealth.
Submit the information in MyTax if possible. If you cannot use MyTax, you can use a paper form or authorise another person to act on your behalf.
Choose your filing method
If you are reporting information for last year, enter the details on your pre-completed tax return. If you are reporting information for the current year, include the information in your tax card request.
If you opt for paper filing, return address is
Finnish Tax Administration
P.O. BOX 700
00052 VERO
Download the form
Instructions
Other forms
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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 6/26/2026