CPF Submission Number (CSN) is a unique identifier used by employers to transact with CPF Board. This includes making CPF payments and making any request relating to employer matters.
A CSN consists of an Unique Entity Number (UEN) or NRIC/FIN (if you’re trading under your own name) and a CPF Payment Code.
You will need to apply for a different CSN for each type of payment you are making. Some examples include mandatory CPF contributions, Voluntary contributions, MediSave contributions under the Additional MediSave Contribution Scheme.
