Limited companies, housing companies, cooperatives, limited partnerships and general partnerships: how to grant authorisations

If you take care of your company’s taxes and you have an official role recorded in the Trade Register, you can manage your company’s tax matters without authorisation. You can log in to the Tax Administration’s e-services with your personal e-bank codes.

If you want to authorise an agent to manage your company’s taxes, do this:

Learn more about Suomi.fi authorisation for tax matters

Granting an authorisation on Suomi.fi

Instructions on Suomi.fi:

Note: An authorised agent cannot change a limited company’s or public company’s bank account number in MyTax. Only a representative of the company or cooperative, with an official role recorded in the Trade Register, can change the bank account number.


If you use Katso authorisations, note that the Katso service can no longer be used after 31 December 2020. Start using Suomi.fi authorisations. The Katso authorisations will not be automatically replaced with Suomi.fi authorisations.

Two or more together signing for the company

A limited company or a housing company can grant an authorisation to an agent even if the Trade Register shows that two or more people together sign for the company.

The articles of association must specify one of the following signature rights:

  • the Board of Directors of the limited company or housing company, all together
  • members of the Board of the limited company or housing company, two together
  • the chairman together with one member of the Board.

The right to sign for the limited company or a housing company must be recorded in the Trade Register and the persons granting authorisations must have Finnish personal IDs.

If you continue using Katso authorisation

Even though Katso authorisations will remain in use in 2020, we advise you to take Suomi.fi authorisations into use as soon as possible. Note that you will only be able to use the following Katso roles:

  • Company’s Master User
  • Company’s Parallel Master User
  • Company MyTax

The following Katso roles have already been discontinued:

  • Company's income tax returns
  • Filer of self-assessed taxes.

More information about Katso authorisations

Katso IDs and authorisations cannot be used after 30 April 2021

Your Katso authorisations will not be automatically replaced with Suomi.fi authorisations. If you are still using Katso authorisations to manage someone else’s tax matters, you must request new Suomi.fi authorisations. Remember to reserve enough time for submitting and processing the request.

When using your Suomi.fi authorisation, log in to e-services with your personal e-bank codes, a mobile certificate or a certificate card.