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 to be used by limited liability companies, cooperative societies and non-mutual real estate companies (however not by capital investment companies).
The form is for reporting tax-exempt capital gains from transfers and liquidations of assets and for reporting non-deductible losses and gains from transfers and liquidations that arise during the tax year from sales and other transfers of fixed-asset shares included in the business source of income.
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
Send the completed form to:
Finnish Tax Administration
OCR service – Yhteisölomakkeiden optinen lukupalvelu
PO Box 200
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