When you log in to MyTax, your tax-related letters will change from paper to electronic form automatically. Read more about the changes.
If you are a registered filer of car tax on new vehicles, submit a period-specific car tax return on the new vehicles once a month. Submit the information in MyTax or via Vero API if possible. If you cannot use MyTax or Vero API, for instance if electronic filing is impossible due to technical difficulties, you can use a paper form.
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The online authorisation mandate
You can use the Suomi.fi Authorization to enable you to deal with taxes for another person – including legal persons, companies, other entities – 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 written in the name of a company, to manage a single tax-related issue. If you – either personally or for an organisation that had been authorised – submit tax-related information on paper, a copy of the letter of authorisation has to be enclosed. A letter of authorisation does not provide access to MyTax.
Power of attorney for managing the taxes of a company (3804)
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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 5/20/2026