Can I volunteer to contribute all my CPF account (OA,SA,MA) as an employee? Can I also contribute my child all CPF OA,SA,MA? I had contributed SA or MA for my child and me before.

Top-up limit to three CPF accounts

The maximum amount you can top up is the difference between the CPF Annual Limit of $37,740 and the mandatory CPF contributions made for the calendar year.

Do remember to consider your mandatory CPF contributions which you will be receiving for the calendar year, before making top-ups. If the total mandatory CPF contributions and top-ups exceed the CPF Annual Limit in the calendar year, any excess top-ups will be refunded without interest.

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https://www.cpf.gov.sg/member/faq/growing-your-...