Is it worth doing cash top up to CPF (~$500) for tax relief if my tax is only $10? At which threshold should I consider cash topup to CPF instead? (Assuming I have already exhausted all other relief)

Don't lol it is jus $10 not worth keeping the $500 being locked

Hey OP, great that you're thinking of topping up your CPF. But before you do so, I would need you to think about why you're topping up your CPF. As YJ has mentioned, depending on your time horizon and risk appetite, CPF may not be the best investment instrument.

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Once you have done your research you can come back to your question. I see the tax relief from CPF topups as a bonus for planning for my retirement and won't chase after it for the sake of it.

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Hope that helps :)