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Making Voluntary Contributions

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Can I use my Unique Entity Number (UEN) to perform transactions with CPF Board? Why do I have to use my CPF Submission Number (CSN)?
You must use your CPF Submission Number (CSN) to perform transactions with CPF Board. The CSN is the Unique Entity Number (UEN) + CPF Payment Code. The UEN alone is not sufficient to identify the different types of CPF payments made by you.