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.

You will need personal online banking codes, a mobile certificate or a certificate card for granting authorisations and using e-services. If you do not have any of these but you want to authorise another party to take care of your tax matters, they can make a request for authorisation.

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.

If you cannot identify yourself electronically

If you want to authorise another party to take care of your tax matters, but you do not have personal online banking codes, a mobile certificate or a certificate card, do as follows:

  1. Recipient of authorisation: Log in to the Suomi.fi e-authorisation service. Make a request for authorisation to the person whom you wish to represent. Instructions on Suomi.fi: Request a mandate for transactions as a person
  2. Recipient of authorisation: After you have made the authorisation request, tell the person you have asked to represent so that they can accept the request.
  3. Person granting the authorisation: If you do not have an electronic method of identification, you must visit a tax office to accept the authorisation request. You must visit the office in person. Check the tax offices’ opening hours

Please note: If the person granting the authorisation has an electronic identification method, they can log in to the Suomi.fi e-authorisation service to accept the request for authorisation.

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. 

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