When you log in to MyTax, your tax-related letters will change from paper to electronic form automatically. Read more about the changes.
This form is for taxpayers concerned by the provisions of the Act on the Taxation of Shareholders in Controlled Foreign Companies (laki ulkomaisten väliyhteisöjen osakkaiden verotuksesta 16.12.1994/1217 – lagen om beskattning av delägare i utländska bassamfund 16.12.1994/1217).
Choose your filing method
Submit the information in MyTax as part of the tax return.
Need instructions for filling in the fields? If so, you can read the instructions for completing the paper form.
You can also give the information electronically by uploading a file in the Ilmoitin.fi service.
If you use Ilmoitin.fi, send us the attachment forms together with the main tax return form.
Do not send any paper forms if you use an online channel for filing the company’s tax return.
Guidance for income tax returns as software files — specifications of data formats
Individual tax payers, self-employed operators of a trade or business, general partnerships, and limited partnerships must enclose the paper form when sending us their tax returns to following address:
Finnish Tax Administration
PO Box 700
FI-00052 VERO
The address for limited-liability companies and other corporate taxpayers for sending the paper form:
Finnish Tax Administration
OCR Service – Corporate
PO Box 200
FI-00052 VERO
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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 3/12/2026