What a CPF or SRS top-up saves you in tax at your income, and what it costs you in money you cannot touch for decades.
This is arithmetic, not advice. It has nothing to sell you and no product to open. The tax saving is real and calculable; whether locking the money away is worth it depends on things this page cannot know. Top-ups cannot be refunded. If a contribution buys you no relief, that money is simply gone from your reach.