Should I use CPF OA or cash to pay HDB loan? Confused about the 2.5 percent interest

Question

First time buyer, just collected keys to my BTO. HDB loan interest is 2.6 percent now. My CPF OA earns 2.5 percent. My colleague says must use cash to pay housing so OA keeps compounding, another says use OA fully so you have cash for emergency. I got about 60k in OA. Which is actually smarter for long term retirement? Feel like whatever I choose I lose something.

Auntie Rosnah Kampung · Accepted Answer

The key concept most people miss is accrued interest. Whatever OA money you use for housing, you must eventually 'repay' to your own CPF with 2.5 percent interest per year when you sell the flat, or it just reduces your sale proceeds. So using OA is like borrowing from your future self at 2.5 percent. Since HDB loan is 2.6 percent, using OA to pay actually saves you a tiny 0.1 percent versus keeping OA and paying loan with cash. But that 0.1 percent is peanuts; the bigger issue is liquidity and discipline. If you use all cash and can genuinely invest or keep that OA untouched till 55, your OA compounds nicely for retirement.

Insurance Sis Priya · Answer

Practical answer: keep 6 months of mortgage buffer in your OA and pay the rest with cash if you can afford it. Reason is not the interest maths, it's protection. If you lose your job, HDB instalment can still be auto-deducted from OA so you don't default and lose the flat. I keep about 12 months of instalments sitting in OA earning 2.5 percent as my safety net, and pay the monthly with cash. Best of both worlds, you sleep well at night.

Techie Jun Hao · Answer

It really comes down to whether you are a disciplined investor. If you take the freed-up cash and just spend it on Shopee and bubble tea, then use OA and force the saving. But if you will actually put that cash into something returning more than 2.5 percent, like a diversified portfolio over 20 years, then paying loan with cash and letting OA compound risk-free at 2.5 percent is the mathematically better long game. Know yourself honestly before deciding.

Auntie Lay Hoon Wet Market · Answer

Just use OA fully and keep your cash. Cash is king for emergencies, opportunities, and things CPF cannot pay for like renovation, wedding, or your kid's stuff. The whole accrued interest thing scares people unnecessarily, remember you are paying it back to YOURSELF, not to the government or bank. When you eventually sell and upgrade, the OA plus accrued interest just recycles into your next property. Don't lock yourself cash-poor just to chase a 0.1 percent optimisation.

Startup Founder Nadia · Answer

Don't forget you can also do partial. I pay half OA half cash. This way my OA doesn't drain to zero (so accrued interest stays manageable), and I still keep more monthly cash than paying fully by cash. When bonus comes I do a partial capital repayment on the loan to cut the tenure. Housing decisions no need to be all-or-nothing, split it based on your comfort level month to month.

Should I use CPF OA or cash to pay HDB loan? Confused about the 2.5 percent interest

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