Scam messages have been sent out in the Tax Administration’s name. Read more about scams.

Car tax return (1200) Forms

File the car tax return 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.

Choose your filing method

Go to MyTax

See guidance: How to file a car tax return in MyTax

Note that there is no need for forms in MyTax.

You can find the return address on the first page of the form.

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

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.

See how to grant and request a Suomi.fi authorisation

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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”.

Read more: “You are a private guardian or have a continuing power of attorney to act as guardian” on the Authorisations page.

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:

The Tax Administration can use automated decision-making in the context of resolving tax matters. This means that a decision concerning your tax matter may be based on partial or full use of an automated decision-making system. Read more about automated decision-making at the Tax Administration (only in finnish).

Page last updated 4/23/2024