Why This Matters
Most Singaporean homeowners service their HDB or private property loan partly from CPF Ordinary Account (OA) and partly from cash. The decision to prepay is more nuanced than in markets where the loan is paid entirely from post-tax income — because CPF OA earns 2.5% guaranteed, and any OA used for housing has to be "returned" to your CPF (with accrued interest) when you sell.
HDB Loan vs Bank Loan: They Behave Differently
HDB concessionary loan:
- Rate is pegged to CPF OA + 0.1% (currently 2.6%)
- No prepayment penalty
- Loan-to-value up to 75%
- Prepayment math: if you prepay using cash, you free up future EMIs; if you prepay using OA, you're effectively moving money from a 2.5% guaranteed account to a 2.6% obligation — the spread is essentially zero.
Private bank home loan:
- Floating SORA-pegged rates currently 3.0–4.0% (2026)
- Fixed-rate packages 2.6–3.4% for 1–3 year locks
- Prepayment penalty during lock-in: typically 1.5% of the prepaid amount; outside lock-in, no penalty
The Core Rule
Prepay if your loan rate is higher than your alternative use of cash, after considering CPF accrued interest.
For HDB loans at 2.6%, almost any reasonable investment beats it. For bank loans at 3.5–4%, the comparison gets interesting.
CPF Accrued Interest: The Hidden Variable
When you use OA to service your home loan, you owe yourself the OA interest you would have earned. At sale, you must refund principal + accrued interest back to your CPF OA before any sale proceeds become yours.
Worked example: you used S$300,000 of OA to fund a property. Over 20 years, the accrued interest at 2.5% compounded is roughly S$192,000. At sale, S$492,000 returns to your CPF OA before the proceeds are split.
This means: prepaying with cash instead of OA preserves more wealth inside CPF, which is high-quality, tax-free retirement money.
What to Compare Against
Alternatives for the surplus cash:
- CPF SA top-up — 4.0% guaranteed, plus up to S$8,000/year tax relief under the Retirement Sum Topping-Up Scheme
- SRS contributions — up to S$15,300 (citizen/PR) or S$35,700 (foreigner), full income tax deduction
- Globally diversified equity ETFs (via Endowus, Syfe, Interactive Brokers) — long-run ~6–7% nominal
- Singapore Savings Bonds — ~3.0% average 10-year yield, fully government-backed
- T-bills / fixed deposits — 3.5–4% short-term
Decision Matrix
| Loan / rate | Best surplus deployment | Action |
|---|---|---|
| HDB loan at 2.6% | CPF SA top-up (4.0%) | Top up SA before any prepayment |
| HDB loan at 2.6% | SRS / equity ETF | Invest |
| Bank loan at 3.5% (no lock-in) | Equity ETF (long-term) | Lean invest |
| Bank loan at 3.5% (no lock-in) | T-bill / SSB (short-term) | Roughly even |
| Bank loan at 4.5% in lock-in | Anything risky | Prepay only outside lock-in window |
The Order of Operations Most Singaporeans Should Follow
- Build a 6-month emergency fund in a high-yield savings account or T-bill ladder.
- Top up CPF SA for the tax relief — capped at S$8,000/year (RSTU). This is a guaranteed 4% return plus an immediate tax saving.
- Max SRS if you're in the 11.5% slab or higher. Invest SRS through Endowus into a globally diversified portfolio.
- Continue scheduled HDB / bank loan EMIs — especially during a bank loan's lock-in period.
- After all the above, channel surplus into equity ETFs in a cash account (Endowus, Syfe, or Interactive Brokers).
- Only then, consider partial prepayment of bank loans outside lock-in.
What to Skip
- Don't prepay your HDB loan at 2.6% while your CPF SA earns 4.0% — that's destroying value.
- Don't prepay during a bank loan's lock-in period unless you can tolerate the 1.5% penalty.
- Don't drain your OA to prepay — you may need OA for the next property's down payment.
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