How to check an already issued tax certificate
You can check a tax certificate from the "Document check service using a secure verification code" that you will find in the highlighted block "Notifications and document comparison."
All certificates issued, whatever the method of application, will have a verification code so that the recipient can verify their authenticity and validity.
This option cannot be used until the certificate has been issued.
This comparison is useful if you have received the certificate by post or email or another other method other than our website.