Accounting firm or other agent: how to request authorisation to take care of someone else’s tax matters

If you need authorisation to take care of another person’s, a company’s or an organisation’s tax matters electronically, you can request an authorisation on Suomi.fi.

Note that the authorising party must accept your request electronically on Suomi.fi with personal e-bank codes, a mobile certificate or a certificate card.

How to request authorisation

1

Find out which authorisations you need

The “Managing of tax affairs” authorisation allows you take care of all the authorising party’s tax matters. The other authorisations allow you to take care of only some specified matters.

Read the descriptions of different authorisations to decide which authorisation you need

You can select the authorisation later in the Suomi.fi e-authorisation service.

2

Request an authorisation on Suomi.fi

Log in to the Suomi.fi e-authorisation service with your personal e-bank codes, a mobile certificate or a certificate card. After that, you can submit an authorisation request to take care of your client’s matters.

Go to the Suomi.fi e-authorisation service

Instructions on Suomi.fi: Request a mandate as a company or an organisation

3

Ask the client to accept your authorisation request

Ask the client to log in to the Suomi.fi e-authorisation service and accept your authorisation request. 

The authorisation request must be accepted separately by each party if the Articles of Association state that the right to sign for the company rests with:

  • the members of the Board all together (limited company, housing company, foundation, association) 
  • two members of the Board together (limited company, housing company)
  • the chairman of the Board together with a Board member (limited company, housing company).

Suomi.fi e-authorisation service

Instructions on Suomi.fi: Grant a mandate as a company or an organisation

Instructions on Suomi.fi: Grant a mandate for transactions as a person

4

You can take care of the authorising party's tax matters electronically

When your request for an authorisation has been accepted, you can log in to the Tax Administration’s e-services with your personal e-bank codes, a mobile certificate or a certificate card. 

After logging in to MyTax, select “Act on behalf of a company” or “Act on behalf of someone else”, depending on whether you are taking care of a company’s or an individual’s tax matters.

An accounting firm may grant an accountant access to only certain customers’ data

The accounting firm can decide which customers’ data each accountant can see in MyTax. When the accounting firm authorises its employees to manage customers’ matters, it can use specifiers to assign certain customers to a certain accountant. Thanks to specifiers, such as customer IDs, the accountants can see in MyTax the details of only those customers whose matters they manage.

Frequently asked questions

Starting 1 July 2021, if you use a strong personal identifier to log in, your authorisation is no longer checked in the list of Katso service authorisations. You need a Suomi.fi authorisation to replace the Katso authorisation.

When you identify yourself to the service with your online banking codes, a mobile certificate or a certificate card, your authorisation to handle matters on behalf of the organisation will be checked with the

  • Trade Register
  • Business Information System (BIS)
  • Register of Associations
  • Suomi.fi Authorisations service.