Corporations are due to file their tax returns soon

Corporate taxpayers whose accounting period ended in December 2024 are due to file their tax returns by 30 April 2025. Corporations include limited liability companies, housing or real estate companies, associations, foundations, municipalities, and foreign corporations.

Submit the tax return and the necessary attachments in MyTax. Alternatively, you can send them as a file in the Ilmoitin.fi service or through a software interface (in Finnish and Swedish, link to Finnish).

Instructions for filing a tax return

See the instructions for filing a tax return by corporate type. See the instructions below to check in which situations a corporation needs to file a tax return. For more detailed guidance, see the instructions for filling in a tax return.

Limited liability companies and cooperative societies

Instructions for filling in Form 6B

Foreign corporations

Instructions for filling in Form 6U

Associations and foundations

Instructions for filling in Form 6C (in Finnish and Swedish, link to Finnish)