When you log in to MyTax, your tax-related letters will change from paper to electronic form automatically. Read more about the changes.
Request a refund of car tax for a vehicle in MyTax if possible. If you cannot use MyTax you can send a paper form or give out a letter of authorisation to have another person deal with tax reporting for you.
You can request a refund of car tax for a vehicle that, upon its first registration in Finland, was entered in the traffic register as a vehicle subject to reduced car tax or as tax-exempt, but car tax was imposed in full. Examples include school taxis and accessible taxis, as well as rescue vehicles and ambulances.
You cannot use this application to request a refund for a used van that is subject to reduced car tax. If you want the vehicle to be taxed as a reduced-tax van, file a claim for adjustment concerning car tax.
Choose how to submit
If the Tax Administration does not have your address, for example if you live abroad, also submit the Notification of mailing address.
Download the form
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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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Page last updated 9/23/2025