Payments may be shown in MyTax with a delay. We apologise for any inconvenience.
Report your income from renting out an apartment in MyTax if possible. If you cannot use MyTax you can send a paper form or authorise another person to act on your behalf.
If you co-own a rental property, you only need to report your share of the rental income and any associated costs (this may be the case if you and your husband/wife are co-owners).
Choose your filing method
Please note that MyTax does not contain numbered forms such as Form 7H.
- If you received rental income last year, enter the details on your pre-completed tax return.
- If you receive rental income during the current year, include the details in your tax card request.
Send the form back to the address printed on it.
Download the form
Instructions
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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 (3818)
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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 4/2/2026