If there is an overpayment of CPF and SDL after payment submission, you can request a refund.
For SDL, you can claim back this amount from SkillsFuture Singapore Agency (SSG).
According to this link from CPFB FAQs, you'll be able to request for the refund by writing in to SSG:
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As for claiming back CPF, you can refer to this link for more detailed steps:
