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General partnerships and limited partnerships report their business income information for income taxation purposes on tax return form 6A. If the company cannot use MyTax, the information can be submitted on a paper form or the company can authorize, for example, an accounting firm to handle its tax matters on its behalf.
Choose how to submit
People holding a certain position in a company (e.g. general partners) can log in to MyTax with their personal e-bank codes or mobile certificate without a separate authorisation.
Other e-services:
Ilmoitin.fi (website for electronic transfer of files)
If you opt for paper filing, send the enclosure forms with your tax return. You can find the return address on the first page of the form.
Download the form
Instructions
Attachment forms
Forms for previous years
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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 11/17/2025