Guernsey Tax ID Number

Social Insurance Number (SIN)

For Individuals

The Social Insurance Number is 6 digits with a prefix of GY.

You can validate tax ID numbers with Tax ID Pro:

• Check tax ID numbers one at a time or with a spreadsheet.
• Learn how to integrate Tax ID Pro into your own software.
• Need to request W-9 or W-8 forms? Check out Nextform.