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TIN Check Guernsey


The first TIN equivalent number is the Social security number issued by the Guernsey Social Security Department.
The 2nd TIN equivalent number is the UK National Insurance Number (NINO).
The 3rd Tin equivalent number is the Jersey Social Security Number.
Some pre 1979 existing UK/Jersey Insurance Numbers remain and are potentially valid TIN for Guernsey purposes.


The Social security number consists of 6 digits prefixed with GY (format: GY999999).
The NINO consists of 9 characters (format: LL999999L).
The Jersey Social Security Number consists 6 digits prefixed with JY and a final letter (format: JY999999L).


The TIN for entities is called “Guernsey Company Registration number”.
The TIN for foundations is the “Foundation Registration number”.
The TIN for charities and non profit organizations are respectively “Charity and Non Profit Organisation registration numbers”


Guernsey Company Registration number consists of 1 to 6 digits.
Foundation Registration number consists of 1 to 3 digits.
Charity Registration number consists of 1 to 3 digits prefixed with CH (format: CH9, CH99, CH999).
Non Profit Organisation number consists of 1 to 3 digits prefixed with NP (format: NP9, NP99, NP999).

GY999999 LL999999L JY999999L CH99 NP99
tincheck app
tincheck dash


We are excited to announce the release of the latest version of the TIN-Check Dashboard, the premier tool for conducting TIN checks.
This new version features a sleek, modern design and enhanced functionality to make TIN checks even more convenient and efficient.

The TIN-Check Dashboard is the ultimate solution for verifying TINs and ensuring compliance.

Upgrade to the latest version today and experience the power and convenience of the TIN-Check Dashboard.

Learn More ->

API Full security

At TIN Check, we take the security of our API very seriously.
We have implemented a number of measures to ensure that our API is secure and protected against potential threats.
These measures include 256-bit TLS/SSL encryption.
We are committed to maintaining the highest standards of security and will continue to invest in the latest
technologies and best practices to keep our API safe and secure for all users.