CPF RST Tax Relief Calculator Singapore 2026
S$16,000 RSTU Annual Relief — Exact Tax Savings at Your Marginal Rate & Effective Return
Calculate your exact income tax savings from CPF Retirement Sum Topping-Up (RSTU) cash top-ups — up to S$8,000/yr for yourself and S$8,000/yr for family members (parents, in-laws, spouse, siblings). Enter your annual chargeable income to see your Singapore marginal tax rate, dollar tax saved, total Year 1 return (tax saving + 4% CPF interest), and a 10-year compounding projection of RSTU benefits.
Enter your annual chargeable income after all other reliefs (employment income minus CPF employee contribution, earned income relief, etc.) but before RSTU. The calculator uses Singapore’s 2026 progressive tax rates (0%–22%) to determine your marginal rate and exact tax saving.
Cash contributions to your own SA (if under 55) or RA (if 55+) up to S$8,000/yr receive income tax relief. Must be cash — OA-to-SA transfers do not qualify. Top-up cannot exceed recipient’s FRS (S$205,800 in 2026).
Eligible family members: parents, grandparents, parents-in-law, grandparents-in-law, spouse, siblings (including step and adopted). Each member’s top-up combined cannot exceed their FRS. The S$8,000 family relief cap applies to the total across all family members.
Select how many years to project cumulative RSTU benefits. Assumes same top-up and tax position each year and 4% p.a. CPF SA/RA interest compounding.
Enter your annual chargeable income and RSTU top-up amounts to see your marginal tax rate, exact tax savings, effective annual return (tax saving + 4% CPF interest), and 10-year projection. Maximum annual RSTU relief: S$8,000 for yourself + S$8,000 for family = S$16,000/yr total.
RSTU Tax Relief Singapore 2026 — S$16,000 Annual Cap, Singapore Progressive Tax Rates & Eligible Family Members
The Retirement Sum Topping-Up (RSTU) scheme is one of Singapore’s most tax-efficient financial strategies. When you make a cash top-up to your own CPF SA (if under 55) or RA (if 55+), or to an eligible family member’s SA/RA, you receive an income tax deduction equal to the top-up amount — up to S$8,000/yr for yourself and S$8,000/yr for family. Since the deduction is applied to chargeable income (not a fixed rebate), the tax saving depends on your marginal tax rate. A member in the 15% tax bracket saves S$1,200 in tax from S$8,000 top-up; a member in the 22% bracket saves S$1,760. Combined with CPF’s guaranteed 4% p.a. interest, the effective Year 1 return on an RSTU top-up ranges from approximately 6–30% depending on income level.
Singapore Personal Income Tax Rates 2026 (Year of Assessment 2026)
| Chargeable Income | Rate | Tax on This Slice | Cumulative Tax |
|---|---|---|---|
| First S$20,000 | 0% | S$0 | S$0 |
| Next S$10,000 (S$20,001–S$30,000) | 2% | S$200 | S$200 |
| Next S$10,000 (S$30,001–S$40,000) | 3.5% | S$350 | S$550 |
| Next S$40,000 (S$40,001–S$80,000) | 7% | S$2,800 | S$3,350 |
| Next S$40,000 (S$80,001–S$120,000) | 11.5% | S$4,600 | S$7,950 |
| Next S$40,000 (S$120,001–S$160,000) | 15% | S$6,000 | S$13,950 |
| Next S$40,000 (S$160,001–S$200,000) | 18% | S$7,200 | S$21,150 |
| Next S$40,000 (S$200,001–S$240,000) | 19% | S$7,600 | S$28,750 |
| Next S$40,000 (S$240,001–S$280,000) | 19.5% | S$7,800 | S$36,550 |
| Next S$40,000 (S$280,001–S$320,000) | 20% | S$8,000 | S$44,550 |
| Above S$320,000 | 22% | Varies | S$44,550+ |
RSTU Tax Saving by Income Level — S$8,000 Self Top-Up
| Annual Income | Marginal Rate | Tax Saved (S$8K RSTU) | CPF Interest (4%) | Total Year 1 Return | Effective % |
|---|---|---|---|---|---|
| S$50,000 | 7% | S$560 | S$320 | S$880 | 11% |
| S$80,000 | 7% | S$560 | S$320 | S$880 | 11% |
| S$100,000 | 11.5% | S$920 | S$320 | S$1,240 | 15.5% |
| S$130,000 | 15% | S$1,200 | S$320 | S$1,520 | 19% |
| S$170,000 | 18% | S$1,440 | S$320 | S$1,760 | 22% |
| S$250,000+ | 22% | S$1,760 | S$320 | S$2,080 | 26% |
How This RST Tax Relief Calculator Works — Marginal Rate Lookup, Effective Return & 10-Year Compounding
Step 1 — Enter Chargeable Income
Enter your annual chargeable income — this is your assessable income after standard CPF employee deductions and earned income relief, but before RSTU. The calculator identifies your marginal tax rate using Singapore’s 2026 progressive brackets and computes both tax before and after the RSTU deduction.
Step 2 — Enter Self and Family Top-Up Amounts
Enter your planned cash top-up for yourself (capped at S$8,000/yr) and for eligible family members (capped at S$8,000/yr total across all family members). Live cap indicators show whether you are within the limit. The calculator automatically applies the cap if inputs exceed S$8,000.
Step 3 — See Effective Return and 10-Year Projection
The effective return combines the immediate tax saving (realised when filing IRAS the following year) with the 4% p.a. CPF SA/RA interest on the top-up. The year-by-year chart shows cumulative CPF balance growth and total tax saved over your chosen projection period — illustrating the powerful compounding effect of annual RSTU top-ups.
3 Real Singapore RSTU Examples — Fresh Grad, PMET S$120K & High-Earner Maximising S$16K
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PMET S$120K + Parent Top-Up
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3 Expert RSTU Tips — November Deadline, Parent Top-Up Strategy & RSTU vs SRS
Top Up Before 31 December — RSTU Relief Applies to the Year of Top-Up
RSTU tax relief is claimed in the Year of Assessment for the year the top-up was made. To reduce your Year of Assessment 2026 tax bill, you must complete the cash top-up to CPF SA/RA by 31 December 2025. A top-up made on 2 January 2026 only reduces your 2027 tax bill — a full year later. This creates a December deadline that many Singaporeans miss. Best practice: set a calendar reminder for late November to review your RSTU top-up for the year. If you have available cash in December, the RSTU top-up is almost always one of the best last-minute tax reduction strategies available — particularly for anyone in the 11.5% bracket and above. The CPF Board e-Cashier at my.cpf.gov.sg processes top-ups instantly and the transaction date is the relief date.
Top Up Your Parents’ RA Before They Hit the FRS — Dual Benefit for You and Them
Topping up a parent’s Retirement Account (RA) provides two simultaneous benefits: (1) You get tax relief (up to S$8,000/yr reduction in chargeable income) at your marginal rate; (2) Your parent receives higher monthly CPF LIFE payouts in retirement (approximately S$5–S$6/month per S$1,000 topped up). For a working child in the 15% tax bracket, topping up S$7,000 into a parent’s RA saves S$1,050 in tax plus generates S$280 in CPF interest — a S$1,330 total benefit while growing the parent’s retirement income. The cap: the parent’s RA cannot exceed the FRS (S$205,800 in 2026 — rising annually). Check your parent’s current RA balance at cpf.gov.sg and calculate the headroom before topping up. Parents who have already reached FRS cannot receive additional RSTU top-ups.
RSTU vs SRS — When to Prioritise Each and How to Use Both
Both RSTU and SRS provide income tax relief, but they work differently: RSTU: S$8,000/yr self + S$8,000/yr family = up to S$16,000 deduction. Money goes to CPF SA/RA earning guaranteed 4% p.a. Not withdrawable before 55/65 (locked in for retirement). SRS: up to S$15,300/yr (residents) or S$35,700 (foreigners). Money invested in SRS account — can buy stocks, ETFs, SSBs, or leave in SRS account (earning 0.05% p.a. — very low). Withdrawable from age 62 at 50% exemption. The optimal sequencing: max RSTU first (guaranteed 4% CPF + tax saving, most efficient), then contribute to SRS up to the annual cap for the remaining tax relief. Do not contribute to SRS and let it sit at 0.05% — invest it in T-Bills, ETFs, or SSBs within the SRS account. The combined maximum from RSTU + SRS = S$31,300/yr in tax deductions for Singapore residents.