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 to report, by sources of income and by types of payers, the dividends and cooperative surplus received by a business partnership.
Choose your filing method
Submit the information in MyTax as part of the tax return.
Other e-services:
Ilmoitin.fi (website for electronic transfer of files)
If you file on paper, you can find the return address on the first page.
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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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Page last updated 6/23/2026