When you log in to MyTax, your tax-related letters will change from paper to electronic form automatically. Read more about the changes.
Capital fund partnerships specifies their taxable profit shares from domestic or foreign partnerships. Report the details even if the partnership has not received a profit share or even if the profit share is not known.
Choose your filing method
Other e-services:
Ilmoitin.fi (website for electronic transfer of files)
If you opt for paper filing, you can find the return address on the first page of the form.
Download the 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:
Page last updated 6/25/2026