User's guide for the Katso system
Go to Precise information Katso - detailed instructions to look for detailed instructions (including Katso ID setup, passwords, authorizations, using e-services for the first time) for Katso users.
Katso instructions for the following taxpayer groups
The Katso ID gives you access to e-filing and e-services. For a complete list of available services go to List of available e-services.
The URL of Katso is yritys.tunnistus.fi.