Singapore taxes on a preceding-year basis, which is the first thing to get straight: income earned during calendar year 2025 is the basis period for Year of Assessment 2026, and the two labels are not interchangeable. The system is territorial, so only income accruing in or derived from Singapore, plus foreign income actually received here in limited circumstances, falls into charge, and there is no capital gains tax, no inheritance tax, and no tax on most dividends because Singapore operates a one-tier corporate system. What complicates an otherwise clean calculation is the relief layer. Personal reliefs are individually capped, and since YA 2018 they are also collectively capped at SGD 80,000 per year of assessment, which silently neutralises aggressive stacking of CPF cash top-ups, SRS contributions, and the Working Mother's Child Relief. Residency status then decides everything else, because a non-resident is taxed under a completely separate rule rather than simply on a different scale.

Key Regulatory Parameters & Frameworks (YA 2026)

Rule 01

Preceding-Year Basis and the Relief Cap

Tax is assessed on the preceding calendar year's income, so YA 2026 assesses 2025 earnings. Reliefs are deducted from assessable income to reach chargeable income, and the total of all personal reliefs claimed is capped at SGD 80,000 for any single Year of Assessment. The cap applies after each relief's own sub-limit, so exhausting the CPF Cash Top-Up Relief, the Supplementary Retirement Scheme relief, and child-related reliefs together can produce a wasted claim.

Rule 02

Resident Progressive Scale

The first SGD 20,000 of chargeable income is exempt. Rates then step 2%, 3.5%, 7%, 11.5%, 15%, 18%, 19%, 19.5%, and 20% through successive bands, with 22% applying from SGD 320,000 and a top rate of 24% on chargeable income above SGD 1,000,000, the latter having been added from YA 2024 along with a new 23% band. Cumulative tax reaches SGD 3,350 at SGD 80,000 and SGD 7,950 at SGD 120,000, which are the reference points most calculations build from.

Rule 03

Non-Resident Treatment Is a Different Rule, Not a Different Rate

A non-resident's employment income is taxed at a flat 15% or at resident progressive rates without any personal reliefs, whichever produces the higher tax. Other income, including director's fees and most other non-employment income, is taxed at 24%. Separately, employment in Singapore of 60 days or less in a calendar year is generally exempt, but that short-stay exemption does not extend to company directors, public entertainers, or non-resident professionals.

Rule 04

Reliefs Worth Knowing

Earned Income Relief is SGD 1,000 for those under 55, rising for older taxpayers and substantially more for the handicapped. CPF Relief covers compulsory employee contributions. Course Fees Relief runs to SGD 5,500, NSman reliefs to SGD 5,000 depending on role and activity, and Qualifying Child Relief is SGD 4,000 per child. Working Mother's Child Relief moved from a percentage of earned income to fixed dollar amounts for children born or adopted from 1 January 2024, which materially reduced its value for high-earning mothers.

Rule 05

Filing, NFS, and Deductions Beyond Reliefs

Filing runs from 1 March with a deadline of 15 April on paper or 18 April electronically. Many taxpayers receive a No-Filing Service notice or a Direct Notice of Assessment and need do nothing unless the pre-filled data is wrong. Distinct from reliefs, approved donations to Institutions of a Public Character attract a 250% deduction and are not caught by the SGD 80,000 relief cap, and Supplementary Retirement Scheme contributions are deductible up to SGD 15,300 for Citizens and Permanent Residents and SGD 35,700 for foreigners.

Example Calculation: Senior Consultant

Scenario Context: Singapore tax resident with SGD 150,000 of assessable employment income for the basis period, claiming SGD 15,000 of reliefs in total (CPF Relief plus Earned Income Relief).

Calculation Stage	Computed Value
Assessable income	SGD 150,000
Less total personal reliefs (within the SGD 80,000 cap)	SGD 15,000
Chargeable income	SGD 135,000
Cumulative tax on the first SGD 120,000	SGD 7,950
Tax on the next SGD 15,000 at the 15% band rate	SGD 2,250
Total tax liability	SGD 10,200
Same income taxed as a non-resident	The higher of 15% flat on SGD 150,000, being SGD 22,500, or the progressive computation with no reliefs

Final Deducted Result:SGD 10,200 payable, an effective rate of 6.8% on SGD 150,000 against a 15% top marginal band. The non-resident comparison is the point worth noting: the same earnings would attract roughly SGD 22,500, more than double, because reliefs are unavailable and the flat rule applies whenever it produces more tax.

Frequently Asked Questions (FAQ)

When do I file my Singapore income tax?▼

The filing season opens on 1 March, with a deadline of 15 April for paper returns and 18 April for e-filing. Tax is payable within one month of the notice of assessment, though an interest-free GIRO instalment plan spreading payment over up to twelve months is widely used. If you receive a No-Filing Service notice, your return is pre-filled from employer and institutional data and you only need to act if something is missing or wrong.

Can foreigners claim tax reliefs?▼

Yes, provided they qualify as tax residents, which generally means staying or working in Singapore for 183 days or more in the preceding calendar year, or qualifying under the two-year or three-year administrative concessions. A resident foreigner claims the same reliefs as a citizen, subject to the SGD 80,000 cap, except for those tied to CPF, since Employment Pass and S Pass holders do not contribute. Non-residents get no reliefs at all.

Is my foreign income taxable in Singapore?▼

Generally not for individuals. Singapore taxes on a territorial basis, and foreign-sourced income received in Singapore by an individual is exempt, other than income received through a partnership in Singapore. Overseas employment that is incidental to your Singapore employment is treated as Singapore income, however, and so is income from an overseas posting undertaken on behalf of the Singapore government, so the exemption is narrower than it first appears.

What happens if I disagree with my notice of assessment?▼

You may file a written objection to IRAS within 30 days of the date of the notice, stating the grounds, and the most common route is the online Object to Assessment service. Critically, tax remains payable on the due date even while an objection is pending, and IRAS refunds any overpayment once the objection is resolved. Late payment attracts a 5% penalty with additional monthly penalties thereafter, so paying under protest is usually the cheaper course.