Every working Singaporean's CPF contributions get split across the Ordinary Account, Special Account, and MediSave Account. The two that drive your retirement wealth are the OA and the SA. The OA is the flexible workhorse — it pays your housing, and it earns the lower floor rate. The SA is the retirement engine — it earns a higher rate but is locked away until 55. Knowing which one to feed, and when, can add tens of thousands of dollars to your eventual CPF LIFE payout. CPF reviews its interest rates every quarter and has been changing scheme rules (notably around the SA at age 55), so treat every figure below as a starting point and confirm the current numbers and rules with the CPF Board before acting.
Base interest rate (floor, as of 2026 — verify with CPF Board): CPF Ordinary Account (OA): Higher of the formula rate or the 2.5% legislated floor (currently at the 2.5% floor); CPF Special Account (SA): Higher of the formula rate or the 4% floor (currently at the 4% floor)
Extra interest, members below 55 (CPF Board): CPF Ordinary Account (OA): Part of the +1% on the first S$60,000 of combined balances (OA portion capped at S$20,000); CPF Special Account (SA): Part of the +1% on the first S$60,000 of combined balances
Extra interest, members 55 and above (CPF Board): CPF Ordinary Account (OA): Part of the +2% on the first S$30,000 and +1% on the next S$30,000 (OA portion capped at S$20,000); CPF Special Account (SA): n/a — the SA is closed at 55 (balances move to the Retirement Account)
Primary purpose: CPF Ordinary Account (OA): Housing, education, insurance, approved investments; CPF Special Account (SA): Retirement income
Can pay for housing?: CPF Ordinary Account (OA): Yes — HDB and private property; CPF Special Account (SA): No
Liquidity before 55: CPF Ordinary Account (OA): Usable now for housing, education and CPFIS investing; CPF Special Account (SA): Effectively locked until 55
Accepts RSTU top-ups (with tax relief)?: CPF Ordinary Account (OA): No (RSTU goes to SA/RA, not OA); CPF Special Account (SA): Yes — up to the relief cap, earns the SA floor rate
Investable via CPFIS: CPF Ordinary Account (OA): Yes (CPFIS-OA, on OA savings above the S$20,000 set-aside); CPF Special Account (SA): Being wound down — CPF has stopped new CPFIS-SA investments; verify current rules with CPF Board
What happens at 55: CPF Ordinary Account (OA): Used to top up the Retirement Account after the SA; remainder withdrawable; CPF Special Account (SA): Closed; balance moves to Retirement Account (up to the Full Retirement Sum), excess to OA
Transfer between them (before 55): CPF Ordinary Account (OA): Can transfer OA to SA (irreversible); CPF Special Account (SA): Cannot transfer SA back to OA
Treat the OA as your housing and flexibility account, and the SA as your retirement compounding engine. The order most people should follow: first secure your housing and an emergency fund, then feed the SA — via RSTU top-ups (a guaranteed SA-floor return plus income tax relief) before considering any OA-to-SA transfer. Only transfer OA to SA once you are confident you will never need that money for property, because the move is permanent and cannot be reversed. If buying a home is still ahead of you, leave the OA alone — liquidity you've already committed to a house is worth more than the roughly 1.5 percentage points of extra interest you can't access. Before acting, confirm the prevailing OA and SA rates for the quarter, the extra-interest bands, the Full Retirement Sum, the RSTU relief caps, and the current SA-at-55 rules with the CPF Board and IRAS.
As of 2026, the OA earns the higher of a formula rate or its 2.5% legislated floor, and the SA earns the higher of a formula rate or its 4% floor (CPF Board) — both have been sitting at their floors, a gap of about 1.5 percentage points. On top of the base rate, CPF pays extra interest on your combined balances: for members below 55, an extra 1% on the first S$60,000 (the OA portion of that base is capped at S$20,000). For members 55 and above, CPF pays an extra 2% on the first S$30,000 and an extra 1% on the next S$30,000 (again with the OA portion of the base capped at S$20,000). CPF reviews these rates every quarter, so verify the current figures with the CPF Board before relying on them.
Yes — while you're below 55 you can transfer OA savings into your SA up to the Full Retirement Sum, and it will earn the higher SA rate. The catch: the transfer is irreversible. Once the money is in the SA you cannot move it back to the OA or use it for a property purchase. Only do this with money you are certain you won't need for housing, and check the prevailing Full Retirement Sum with the CPF Board first.
For retirement, the SA wins because of the higher rate and the long compounding runway. RSTU (Retirement Sum Topping-Up Scheme) top-ups go to the SA, not the OA, and they can also qualify for income tax relief (subject to annual caps — confirm with IRAS/CPF) — so you get a guaranteed SA-floor return and a smaller tax bill. Prioritise the OA only if you still need the flexibility for housing or education.
No. RSTU only tops up the Special Account (or the Retirement Account from age 55). The Ordinary Account does not receive RSTU top-ups, and ordinary OA voluntary contributions don't get the same dedicated tax relief. If your goal is guaranteed retirement growth plus tax relief, RSTU into the SA is the route — check the current relief caps with IRAS/CPF.
At 55 a Retirement Account (RA) is created, and savings are used to set aside your retirement sum. Under changes that took effect on 19 January 2025, the Special Account is closed at 55: SA savings move to the RA up to your cohort's Full Retirement Sum (where they keep earning the long-term rate), and any remainder moves to the OA (which is withdrawable and earns the OA rate). Because these rules have changed recently, confirm the current treatment with the CPF Board before making transfer decisions near 55.
It depends on whether you've already covered housing and emergencies. The extra interest — roughly 1.5 percentage points a year at the current floors — compounds into a meaningful sum over decades, but it comes at the cost of total illiquidity until 55. If you might still buy a home, that flexibility is worth more than the extra interest. Lock money into the SA only after your housing plan and emergency fund are settled.