On 30 March, the e‑MTA customer portal transitioned to the State SSO service (GovSSO). This means that you will be able to log in to all government e-service environments that have subscribed to this service using a single authentication within one session.
In the future, you can manage your active sessions via the self-service portal of the State Authentication Service at https://minuautentimine.ria.ee/.

Signing in to the e-services environment of the Estonian Tax and Customs Board

Access to the e-services environment is provided through the State Authentication Service. Click "Sign in" and follow the instructions.