You can log in as an individual taxpayer or corporate taxpayer.
If you are an individual taxpayer, you need personal online banking codes to log in.
You cannot use the banking codes of a corporate entity to log in as an individual taxpayer. If you are a corporate taxpayer, you need Suomi.fi authorisation or a Katso ID.
You can log in to MyTax with your online banking codes, a mobile certificate, or a Katso ID.
If you wish to act on behalf of someone else, you will need Suomi.fi authorisation or a Katso ID.
Read more about ídentification