CPF Shielding Calculator — Special Account Strategy
Calculate the lifetime interest-rate savings of CPF SA shielding (or its successor strategies after the SA closure for age 55+). Compare the 4% SA-rate path vs the 2.5% OA-rate path for sums above the Full Retirement Sum at age 55.
| Years until age 55 | — |
| SA at 4% growth (no shielding) | — |
| SA shielded → CPFIS at age 55 | — |
| Excess SA above FRS at 55 | — |
| SA-rate growth (post-55) | — |
| OA-rate growth (post-55, no shielding) | — |
What Is CPF Shielding?
"CPF shielding" is a Singapore retirement strategy used by CPF members in their 50s to keep more of their savings earning the higher Special Account (SA) interest rate of 4% per year (vs 2.5% in Ordinary Account / 2.5% in the Retirement Account when funds spill over). The classic shielding move: just before turning 55, transfer SA funds above the Full Retirement Sum (FRS) into CPF Investment Scheme (CPFIS) — typically a low-cost Singapore Savings Bond or short-term endowment — keeping the SA balance at exactly $40,000 (the minimum sum required to retain SA). When you turn 55 and the Retirement Account (RA) is created, only the FRS comes from your SA at that low balance; the rest of your SA continues earning 4% via the CPFIS investment until you redeem it (source: CPF Board).
2026 update — SA closure announcement: In Budget 2024 the Government announced that from approximately 2025-2026, the SA will be closed for members aged 55 and above; the SA-RA structure will be replaced. SA balance amounts above the FRS will be transferred to OA (earning 2.5%) rather than RA (4%). This makes "shielding" before 55 even more valuable for those still under 55 — once you reach 55, the protected amount can no longer earn the 4% SA rate. Members under 55 in 2026 should plan accordingly.
How the 2026 Math Works
The classic shielding savings come from the rate spread: 4% SA vs 2.5% RA/OA = 1.5%/year. On $200,000 of "shielded excess SA" held for 10 years post-55, the difference compounds to approximately $35,000 in additional interest. Worked example: A 50-year-old with SA $250,000, OA $100,000, FRS target $213,000 (2026 figure). Without shielding: at 55 entire SA + part of OA goes to RA at FRS amount; remaining SA above FRS ($37,000) goes to OA at 2.5%. Over 10 years past 55, that $37,000 + auto-extending OA grows at 2.5% to about $47,300. With shielding pre-55: $37,000 invested via CPFIS in T-Bills earning ~3.5% over 10 years grows to about $52,200. Difference: $4,900 on this scenario. Larger SA balances proportionally amplify the savings.
The strategy works because CPFIS investments are NOT counted toward the FRS calculation when the RA is formed at 55 — only the SA cash balance is transferred. By temporarily moving cash out of SA into a CPFIS-approved investment immediately before turning 55, you reduce the SA cash count for the RA transfer, leaving more "surplus" SA cash above the FRS that retains the 4% rate (or, post-closure, that you can withdraw or reinvest as you choose) (source: CPFIS guidance).
Strategy — Steps and Timing
Implementation: (1) Open a CPFIS account at one of the appointed agent banks (DBS, OCBC, UOB) at age 50+. (2) Identify a low-volatility CPFIS-approved investment — Singapore Savings Bonds (T-Bills), short-duration corporate bonds, or low-fee balanced funds. (3) Approximately 6 months before turning 55, transfer the SA balance above $40,000 into your selected CPFIS investment. (4) Let RA form at age 55 with $40,000 from SA + balance from OA up to FRS. (5) After 55, the remaining CPFIS investment continues at the underlying rate; you can liquidate when convenient (no deadline).
Important constraints: CPFIS-SA investment limits apply ($40,000 minimum stays in SA cash; first $20,000 of investible SA reserved). The new SA closure rules may further restrict or reframe this strategy in 2026 — check with CPF Board for current procedures.
Common Mistakes
(1) Investing in volatile assets — equity funds may underperform the 4% SA rate, defeating the purpose. Stick with high-quality bonds, T-Bills, or fixed-income endowments. (2) Wrong timing — shielding must happen BEFORE the 55th birthday; once RA is formed, the cash has already moved. (3) Not understanding CPFIS-SA exclusion — first $20,000 of SA cannot be invested via CPFIS. (4) Forgetting Medisave — Medisave Catch-Up does not affect SA shielding, but ensure your Basic Healthcare Sum is funded.
For other Singapore CPF tools, see our CPF retirement calculator, CPF Life payout, CPF 2027 rate calculator, and CPF FIRE calculator.
Last updated April 2026. Estimates only — confirm current SA / RA / CPFIS rules with CPF Board. SA closure for age 55+ is being phased; verify current state at cpf.gov.sg. Sources: CPF Board, Ministry of Finance Budget.