Guernsey Tax ID Number

Social Insurance Number (SIN)

For Individuals, Example: GY723453

The Guernsey Social Insurance Number (SIN) is 6 digits with a mandatory prefix of GY. Guernsey does not issue TINs in the strict sense, however, for the purposes of the CRS and in relation to individuals only, Guernsey has adopted the use of Social Insurance numbers as the functional equivalent of a TIN. For the avoidance of doubt Social Insurance Numbers are only issued to individuals. These are issued by the Guernsey Revenue Service and are issued to an individual at birth (where born in the Bailiwick of Guernsey) or on moving residence to Guernsey.