When you log in to MyTax, your tax-related letters will change from paper to electronic form automatically. Read more about the changes.
Use this form to submit your (or your child's if they are under 18 years of age) bank account details to the Tax Administration to receive tax refunds. The easiest way to inform the tax office of your bank account number is in MyTax.
MyTax also allows you to submit the bank account number of your child. A child under 18 can also submit their own bank account number in MyTax if they have their own online banking codes or a mobile certificate.
Choose your filing method
The form is for individual taxpayers, i.e. for individuals who are not VAT-registered. If you are self-employed, or if you are a VAT taxable person for other reasons, you must submit the information electronically in MyTax.
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
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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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For additional guidance and updates, the Tax Administration has released special instructions concerning the bank account numbers of estates of deceased persons, clients under private guardianship, companies and other corporate taxpayers:
Key terms:
Page last updated 6/12/2026