Singapore CPF Allocation Guide: OA, SA & MA Ratios, 4.0% Floor Rates & HDB Housing Math
Singapore's Central Provident Fund (CPF) is widely regarded as one of the world's most robust mandatory social security systems. For citizens and Permanent Residents aged 55 and below, 37% of monthly wages (20% employee + 17% employer, subject to the Ordinary Wage ceiling) are split across three specialized accounts: the Ordinary Account (OA), Special Account (SA), and MediSave Account (MA).
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1. The 3 Accounts & Interest Rates
CPF deposits earn risk-free, government-backed interest guaranteed by the Singapore Government (AAA-rated):
| CPF Account | Primary Purpose | Guaranteed Floor Interest Rate |
|---|---|---|
| Ordinary Account (OA) | Housing (HDB/Private), CPFIS Investing, Tertiary Education | 2.50% p.a. |
| Special Account (SA) | Long-term retirement accumulation (Ages ≤ 55) | 4.00% – 4.08% p.a. |
| MediSave Account (MA) | Hospitalization, Integrated Shield Plans, Senior Care | 4.00% – 4.08% p.a. |
Extra Interest: The first SGD 60,000 of combined CPF balances (up to SGD 20,000 in OA) earns an extra 1.0% bonus interest (yielding 3.5% on OA and 5.0% on SA/MA).
2. Allocation Ratios by Age Group
As workers age, the government shifts higher proportions of the 37% contribution from OA to SA and MA to prepare for retirement and healthcare:
- Age 35 & Below: OA (23.0%), SA (6.0%), MA (8.0%) — Total: 37.0%
- Age 36 to 45: OA (21.0%), SA (7.0%), MA (9.0%) — Total: 37.0%
- Age 46 to 50: OA (19.0%), SA (8.0%), MA (10.0%) — Total: 37.0%
- Age 51 to 55: OA (15.0%), SA (11.5%), MA (10.5%) — Total: 37.0%
3. Using CPF OA for HDB Loans: The Accrued Interest Catch
When you use CPF OA to pay your HDB flat down payment and monthly mortgage, you must repay that principal plus 2.5% accrued compound interest back into your own CPF OA when you sell the property in the future. If property price appreciation does not beat 2.5% annually, you receive less cash in hand upon resale.
4. The Enhanced Retirement Sum (ERS)
At age 55, a Retirement Account (RA) is created by merging your OA and SA. The Enhanced Retirement Sum (ERS) has been expanded to 4x the Basic Retirement Sum (approx SGD 426,000), allowing Singaporeans to lock in lifetime monthly payouts of over SGD 3,300/month under CPF LIFE starting at age 65.
5. The 1M65 Compounding Blueprint
By making voluntary cash top-ups (RSTU) to max out the Full Retirement Sum early in your 20s and 30s, the power of 4.0% guaranteed compounding allows an individual (or couple targeting 4M65) to reach SGD 1,000,000 in CPF balances by age 65 completely on auto-pilot.