CPF Cash Top-Up Tax Relief Calculator Singapore 2026
Estimate your income tax savings from CPF Retirement Sum Topping-Up Scheme (RSTU) contributions — free calculator with real-time results in SGD.
Your CPF Top-Up Details
Your Estimated Tax Savings
Estimates based on Singapore personal income tax rates (YA 2026). For reference only — always verify with IRAS.
Understanding CPF Cash Top-Up Tax Relief for Singapore Taxpayers
The CPF Retirement Sum Topping-Up Scheme (RSTU) is one of Singapore’s most under-utilised tax relief mechanisms. Under the scheme, Singapore Citizens and Permanent Residents can make cash top-ups to their own CPF Special Account (SA, if below 55) or Retirement Account (RA, if 55 and above), as well as to the SA/RA of eligible family members — and claim a dollar-for-dollar reduction in chargeable income, capped at $8,000 per category per Year of Assessment (YA). The maximum combined relief is $16,000 per YA, effective from YA 2023 onwards following a revision by IRAS and CPF Board.
For a Singapore resident paying tax at the 11.5% marginal rate (chargeable income between $80,001 and $120,000), a full $8,000 self top-up translates to approximately $920 in actual tax saved — essentially a guaranteed 11.5% return on the topped-up amount in Year 1 alone, before CPF’s 4% per annum SA/RA interest rate kicks in.
Not financial advice. All figures are for educational reference only. Tax estimates are based on Singapore resident personal income tax rates as published by IRAS for YA 2025/2026. Always verify with the Inland Revenue Authority of Singapore (IRAS) for your precise assessment.
How the $8,000 + $8,000 Relief Works
IRAS splits the CPF cash top-up tax relief into two distinct buckets. The first is for top-ups to your own SA or RA — capped at $8,000 per YA. The second is for top-ups to the SA or RA of your spouse, parents, parents-in-law, grandparents, grandparents-in-law, or siblings — also capped at $8,000 per YA. Each bucket is assessed independently, meaning you can claim up to $16,000 in total relief if you make the maximum top-up under both categories.
CPF SA Closure for Those Aged 55 and Above (From 2025)
From 21 January 2025, the CPF Special Account was closed for members aged 55 and above. If you are 55 or older, RSTU top-ups now go directly into your Retirement Account (RA). For members below 55, the SA continues to operate as normal, earning the 4% per annum floor rate. This change does not affect eligibility for the tax relief.
How to Use This CPF Top-Up Tax Relief Calculator
- Enter your annual chargeable income: Use the slider to set your total chargeable income — this is your assessable income after all other deductions but before the RSTU top-up relief you are about to claim.
- Set your self top-up amount: Slide to the amount you plan to top up into your own SA/RA. The maximum eligible for tax relief is $8,000 per YA.
- Set your family member top-up amount: If you are also topping up an eligible family member’s SA/RA, enter that amount (capped at $8,000 for relief purposes).
- Read your results: The calculator instantly shows your total eligible relief, estimated tax before and after, and your net tax savings in SGD.
Results update in real time. The calculator applies Singapore’s progressive resident personal income tax brackets for YA 2026 as published by IRAS.
Pro tip: Combine this calculator with our SRS Tax Savings Calculator to see the full picture of tax-advantaged retirement savings — RSTU and SRS are separate relief categories and can be claimed simultaneously.
Contents — Click to Expand
What Is CPF Cash Top-Up Tax Relief?
CPF Cash Top-Up Tax Relief is a personal income tax deduction for Singapore Citizens and PRs who voluntarily top up their own or an eligible family member’s CPF account under the Retirement Sum Topping-Up Scheme (RSTU). Unlike mandatory CPF contributions handled via payroll, RSTU top-ups are entirely voluntary — made in cash directly to CPF Board.
The relief works as a direct reduction of your chargeable income for the Year of Assessment. If your chargeable income is $120,000 and you top up $8,000 to your own RA, your revised chargeable income becomes $112,000. IRAS then computes your tax on the lower figure, saving anywhere from $560 (at 7% marginal rate) to $1,760 (at 22% marginal rate) per $8,000 topped up.
RSTU top-ups are irreversible — once deposited into CPF, the money follows CPF withdrawal rules. This makes RSTU best suited to investors comfortable ring-fencing a portion of wealth in the CPF ecosystem in exchange for tax savings and competitive 4%-5% per annum CPF interest rates. Use our CPF Retirement Sum Calculator to see how RSTU top-ups accelerate your progress toward the Full Retirement Sum.
How the Tax Relief Maths Works: Singapore’s Progressive Tax Brackets
Singapore uses a progressive personal income tax system — only the income in each bracket is taxed at that bracket’s rate. For YA 2026 (income year 2025), the brackets are as published by IRAS: 0% on the first $20,000, 2% on the next $10,000 (cumulative tax $200), 3.5% on the next $10,000 ($550), 7% on the next $40,000 ($3,350), 11.5% on the next $40,000 ($7,950), 15% on the next $40,000 ($13,950), 18% on the next $40,000 ($21,150), 19% on the next $40,000 ($28,750), 19.5% on the next $40,000 ($36,550), 20% on the next $40,000 ($44,550), and 22% above $320,000.
Worked example: A Singapore resident with $160,000 chargeable income tops up $8,000 self and $8,000 for spouse (total $16,000 relief). Tax on $160,000 = $19,950. Tax on $144,000 = $17,550. Tax saved = $2,400 — a guaranteed 15% first-year return on $16,000, plus compounding CPF interest from Year 2 onward.
RSTU vs SRS: Two Tax Relief Strategies Compared
Singapore offers two main voluntary tax relief pathways for retirement savers: RSTU (CPF top-ups) and the Supplementary Retirement Scheme (SRS). RSTU gives up to $16,000 relief with guaranteed 4% CPF returns, family top-up capability, but strict illiquidity. SRS gives up to $15,300 relief with market-linked investment options and more flexible withdrawal at statutory retirement age (50% of SRS withdrawal is taxable). Use our SRS Tax Savings Calculator to compare. A Singapore investor earning $160,000 could claim up to $31,300 in combined RSTU + SRS relief, saving approximately $5,100 in income tax. Use our Retirement Planning Calculator for a holistic view.
Best Platforms for Making CPF Cash Top-Ups in Singapore
Cash top-ups under RSTU must be made directly to CPF Board via my.cpf.gov.sg (PayNow or FAST — free, same-day), the CPF Mobile App (PayNow or GIRO), or AXS Stations (cash/NETS, small fee). For investing beyond CPF, we recommend Endowus (CPF OA via CPFIS, SRS, and cash), Syfe (cash and SRS portfolios), and FSMOne (unit trusts and ETFs). These are market-linked options separate from RSTU top-ups.
CPF SA Closure, RA Limits, and 2026 Retirement Sums
From 21 January 2025, the CPF Special Account was closed for members aged 55 and above — RSTU top-ups now go directly to the Retirement Account. For those under 55, the SA still operates with the same 4% floor rate. The 2026 estimated retirement sums are: BRS ~$106,500, FRS ~$213,000, ERS ~$319,500 (subject to CPF Board’s official announcement). RSTU top-ups to RA are capped at ERS minus existing RA balance. Use our CPF Retirement Sum Calculator to model your headroom.
CPF Top-Up as a Retirement Income Strategy
Consider a 35-year-old topping up $8,000 annually for 20 years: at 4% per annum, the $160,000 contributed grows to approximately $248,000 — an $88,000 gain from interest alone, entirely risk-free. Add cumulative tax savings of $5,000-$12,000 over 20 years and the total benefit can easily exceed $100,000. When this pool converts to CPF LIFE payouts, a $248,000 RA could generate $1,200-$1,500 per month in CPF LIFE income, guaranteed for life.
Use our CPF LIFE Payout Calculator to estimate your monthly payouts, and our Retirement Planning Calculator to see how CPF top-ups fit your overall plan. For market-linked income to complement CPF, our Singapore Passive Income Guide covers S-REITs, ETFs, and robo-advisors.
Frequently Asked Questions
How much CPF cash top-up tax relief can I claim in Singapore?
You can claim up to $8,000 for cash top-ups to your own CPF RA or SA, and an additional $8,000 for top-ups to eligible family members’ CPF accounts — a maximum combined relief of $16,000 per year. This is capped at the actual amount topped up, so if you top up only $5,000, only $5,000 qualifies as relief. IRAS will verify your top-up history directly with CPF Board.
Who qualifies as an eligible family member for RSTU top-up tax relief?
Eligible family members include your spouse, siblings, parents, parents-in-law, and grandparents (including grandparents-in-law). Siblings must have an annual income not exceeding $4,000 in the year of top-up. There is no income test for spouses, parents, or grandparents. The family member must be a Singapore Citizen or PR.
Can I reverse a CPF cash top-up if I change my mind?
No — RSTU cash top-ups are irreversible. Once funds are deposited into CPF, they follow standard CPF withdrawal rules: accessible at age 55 (subject to the Full Retirement Sum being met) and eventually converted to CPF LIFE monthly payouts. This illiquidity is the main trade-off for the guaranteed 4% SA/RA interest and tax savings.
Is CPF cash top-up tax relief the same as SRS tax relief?
No — these are two separate tax relief schemes. RSTU (CPF top-up) allows up to $16,000 relief with funds earning guaranteed 4% CPF interest, but the money is illiquid until retirement. SRS allows up to $15,300 relief (Singapore Citizens/PRs) with funds invested in market-linked products and more flexible withdrawal at statutory retirement age (50% of withdrawals are taxable). Both can be combined in the same year.
When must I make the CPF cash top-up to claim relief for that year?
Top-ups must be received by CPF Board by 31 December of the calendar year to qualify for that Year of Assessment’s tax relief. For example, to claim relief for YA 2026 (income earned in 2025), you must top up by 31 December 2025. Top-ups made in January 2026 will count for YA 2027. CPF Board issues a confirmation statement which IRAS uses to verify your claim automatically — no manual submission required in most cases.
What CPF account should I top up — SA or RA?
For members under 55, RSTU top-ups go to the Special Account (SA), which earns 4% p.a. floor interest. From age 55, the SA is closed and top-ups go directly to the Retirement Account (RA), also earning 4% p.a. Both accounts qualify for the same tax relief. If you are approaching 55, note that the SA closure (from January 2025) means top-up planning becomes RA-focused from that point.
How do I calculate my CPF top-up tax savings in Singapore?
Your tax savings equal the tax on your gross chargeable income minus the tax on your income after deducting the top-up relief. Use our calculator above: enter your chargeable income (after mandatory CPF deductions and other reliefs), your self top-up amount (max $8,000), and your family top-up amount (max $8,000). The calculator applies Singapore’s YA 2026 progressive tax brackets and shows your exact savings instantly in SGD.
Does CPF top-up tax relief reduce my CPF Annual Limit?
RSTU voluntary cash top-ups count toward the CPF Annual Limit of $37,740 (as at 2026), which also includes mandatory employer and employee CPF contributions. If your mandatory contributions already total $37,740 or more, you cannot make additional RSTU top-ups for that year. High earners with a salary above $102,000 per year may find their RSTU headroom is limited by mandatory contributions — check your CPF account balance online at my.cpf.gov.sg before topping up.
Which platform is best for making CPF top-ups in Singapore?
The easiest way is via my.cpf.gov.sg using PayNow — free, instant, and available 24/7. The CPF Mobile App offers the same functionality. AXS Stations (cash/NETS) charge a small convenience fee. For investing beyond CPF top-ups, platforms like Endowus (CPF OA through CPFIS) and Syfe (SRS and cash) complement your RSTU top-up strategy with market-linked returns.
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