How to Calculate CPF Cash Top-Up Tax Relief in Singapore: A Step-by-Step Guide
Estimates the tax saved from Retirement Sum Topping-Up: up to S$8,000 for yourself and S$8,000 for family members.
Singapore's tax system is simple by global standards, but the progressive bands, reliefs and the 9% GST still trip people up. A quick calculation helps you set aside the right amount before IRAS sends your notice of assessment, or check that a bill has been worked out correctly.
What you need
- Chargeable income before top-up (S$)
- Cash top-up qualifying for relief (S$)
Step by step
- Enter the chargeable income before top-up (S$).
- Enter the cash top-up qualifying for relief (S$).
- The results update as you type, or press Calculate.
- Read the tax saved first, then the supporting figures below it.
The formula
Tax saved = tax(chargeable income) − tax(chargeable income − relief).
Worked example
For example, with these inputs:
- Chargeable income before top-up (S$): 90,000
- Cash top-up qualifying for relief (S$): 8,000
the calculator returns:
- Tax saved: S$920.00
- Relief applied (max S$16,000): S$8,000.00
A second example
Now change the inputs to:
- Chargeable income before top-up (S$): 112,500
- Cash top-up qualifying for relief (S$): 8,000
the calculator returns:
- Tax saved: S$920.00
- Relief applied (max S$16,000): S$8,000.00
Practical tips
- Restaurant '++' prices add a 10% service charge first, then 9% GST on the total.
- GST-registered businesses must show prices inclusive of GST to consumers, so a listed retail price already includes the 9%.
- SRS and CPF top-up relief save more tax the higher your marginal rate is.
- Non-residents cannot claim personal reliefs, which is why their effective rate is usually higher.
Background
Tax planning in Singapore is mostly about timing and reliefs rather than complex structures. Topping up CPF, contributing to SRS and claiming every relief you qualify for can lower your marginal rate band, and the savings are larger for higher earners.
You are generally a tax resident if you are a citizen or PR who normally lives here, or a foreigner who has stayed or worked in Singapore for at least 183 days in the calendar year. Non-residents do not get personal reliefs and are taxed differently, which is why residency status matters so much for expatriates.
Singapore taxes individuals on income earned in Singapore, with progressive rates for residents that start at 0% on the first S$20,000 of chargeable income and rise to 24% on income above S$1 million. Tax is assessed a year in arrears: income earned in 2025 is assessed in Year of Assessment 2026.
Related calculations
- Singapore Income Tax Calculator: Calculates resident individual income tax from YA2024 onwards using Singapore's progressive rates from 0% to 24%.
- Salary Income Tax Estimator: Estimates a resident employee's annual income tax from monthly salary and bonus, allowing for CPF relief and earned income relief.
- Non-Resident Income Tax Calculator: Non-resident employees pay the higher of 15% flat or progressive resident rates on employment income, without personal reliefs.
- GST Calculator (9%): Adds Singapore's 9% Goods and Services Tax to a price.
Want to skip the arithmetic? The free CPF Cash Top-Up Tax Relief Calculator does all of this instantly and updates as you type.
Run your own numbers: CPF Cash Top-Up Tax Relief Calculator