When it comes to paying down an HDB flat, one of the sharpest debates in any Singaporean household is whether to wipe out every last dollar in the CPF Ordinary Account or hold back a $20,000 buffer — and the answer is not as straightforward as most people think.
Here’s the thing most people miss. That $20,000 sitting in the OA isn’t just collecting dust. It earns 3.5% per annum — that’s the base 2.5% plus an extra 1% on the first $20,000. Compare that to the HDB loan rate of 2.6%, and suddenly keeping the buffer actually makes mathematical sense.
Over 20 years, that $20,000 compounds to nearly $39,700. Almost double. That’s not a rounding error. That’s retirement money.
But keeping the buffer does raise your monthly instalment. On a 20-year loan at 2.6%, retaining $20,000 can push payments up by roughly $200 a month.
Think of it like choosing the slightly pricier economy rice stall — costs more upfront, but you’re actually getting better value if you look at the full picture. The question is whether your cash flow can handle the extra bite each month.
The safety net argument is equally compelling. Life doesn’t run on a straight MRT line. Job losses, medical emergencies, family disruptions — they happen.
That $20,000 buffer can cover anywhere from 6 to 15 months of mortgage instalments, depending on your loan size. That’s real breathing room when things go sideways.
For HDB loan borrowers, the rules are clear: retain up to $20,000, and anything above must go toward the down payment. Bank loan borrowers have more flexibility but face CPF withdrawal limits capped at 120% of the property valuation. CPF funds used for housing must be refunded with accrued interest upon the sale of the property, meaning the longer you draw on your OA, the larger the repayment obligation becomes. This consideration carries added weight given that HDB resale prices have risen for 17 consecutive quarters, meaning the property you purchase today is likely to transact at a higher value down the road, amplifying the CPF refund amount owed upon sale.
And upon selling, CPF refunds with accrued interest are mandatory — so larger withdrawals today mean larger refunds later.
The bottom line? Wiping out the OA feels satisfying, like finishing a full plate of chicken rice. But keeping that buffer? That’s the smart, long game. Run your numbers. Don’t just follow instinct.
