Private individuals: how to grant a Suomi.fi authorisation for tax matters

You can authorise another person or company to take care of your tax matters on your behalf. You can grant a Suomi.fi authorisation for all your tax matters or for a specific tax matter.

If you take care of your underage child’s tax matters in MyTax, you do not need an authorisation. The e-authorisation service checks the Population Information System to see if you have a guardian’s right to manage the child’s tax matters.

To log into the e-services and to give a Suomi.fi e-authorisation to someone you need personal e-bank codes, a mobile certificate or a certificate card. If you cannot login as you do not have any of the above, you cannot authorise another person or company to handle your taxes through electronically provided services. In this case, you can complete and sign a letter of authorisation on paper. Give the letter to the person or company to let them represent you. Then they can submit tax forms on paper on your behalf, contact the Tax Administration’s telephone service to handle your taxes, and visit the tax office on your behalf.

How to grant an authorisation on Suomi.fi

1

Select one or multiple authorisations

The “Managing of tax affairs” authorisation allows the authorised party to see, edit and file all your tax data in all Tax Administration service channels (MyTax, tax offices, telephone service). The authorised party can also change your bank account number in MyTax. Other authorisations only cover certain individual matters.

Read the authorisation descriptions to see which authorisation fits your needs

You will be able to select the authorisation later in the Suomi.fi e-authorisation service.

2

Grant an authorisation on Suomi.fi

Log in to Suomi.fi with your personal online banking codes or by another identification method and grant the authorisation in the e-service.

Go to the Suomi.fi e-authorisation service

After you have granted an authorisation on Suomi.fi, it will enter into effect immediately. The authorised party can then log in to MyTax with their personal online banking codes and take care of the authorising party’s tax matters there.

Frequently asked questions

If you are a private guardian, you cannot use MyTax or the Tax Administration’s other e-services on behalf of the individual under your guardianship unless they can use electronic identification and grant you the authorisation to do so. In this case, you can fill out tax forms on paper and submit them on the other person’s behalf.

Go to Suomi.fi for more information on when you can and cannot act on behalf of someone else

If you take care of your underage child’s tax matters in MyTax, you do not usually need an authorisation. The e-authorisation service checks the Population Information System to see if you have a guardian’s right to manage the child’s tax matters.

Taking care of an underage child’s tax matters requires consent from both parents if, for example, you have divorced the other parent of your child and cannot automatically take care of your child’s tax matters in MyTax due to a joint custody agreement. In such a case, you can grant one parent or both parents a Suomi.fi authorisation that enables you to take care of your child’s tax matters electronically.

Further information and instructions on Suomi.fi: Acting on behalf of another person