Corporate tax basics: the 17% rate and what softens it

Singapore's headline corporate rate is a flat 17%. The effective rate for a young company is usually far lower, because two exemption schemes shelter the first slices of profit. Understanding the computation — not just the rate — is what lets you plan.

The computation in one line

Tax payable = (income − deductible expenses − exemptions) × 17%.

The starting point is accounting profit, adjusted under the Income Tax Act 1947:

• add back expenses that are not deductible — private expenses, S-plate car costs, provisions and the like;
• remove income that is not taxable — most commonly one-tier dividends from Singapore companies;
• replace accounting depreciation with capital allowances at tax rates.

The result is chargeable income, and it is why your tax bill never equals "profit × 17%".

The start-up exemption (SUTE)

For its first three Years of Assessment, a qualifying new company is exempt on:

• 75% of the first S$100,000 of normal chargeable income; and
• 50% of the next S$100,000.

That is up to S$125,000 of profit exempted per YA. A start-up earning S$200,000 of chargeable income pays 17% on only S$75,000 — S$12,750, an effective rate of about 6.4%.

The full conditions, per IRAS. All must hold:

1. Incorporated in Singapore.
2. A tax resident of Singapore for that YA — see the warning below.
3. No more than 20 shareholders throughout the basis period for that YA, and either all shareholders are individuals, or at least one individual shareholder holds at least 10% of the issued ordinary shares.
4. Not a company whose principal activity is investment holding, or property development for sale or investment — both are excluded outright.

There is no application; you claim it in the return.

The condition founders miss is residency. Incorporating in Singapore does not make a company Singapore tax resident — that turns on where control and management is exercised. A company run from overseas through a nominee director can be non-resident, and a non-resident company gets no start-up exemption at all. If any part of your structure is directed from abroad, read tax residency: why a Singapore company may not be Singapore tax resident before relying on these numbers.

Because the exemption runs for exactly three YAs whether or not you make profit, when your first financial year ends matters. A poorly chosen first FYE can burn an exemption year on a period with no income — see timing your first FYE.

The partial exemption (PTE)

From the fourth YA onwards — or from the start, for companies that never qualified — the partial exemption applies automatically:

• 75% of the first S$10,000; and
• 50% of the next S$190,000.

Up to S$102,500 of chargeable income exempted each YA, for every company, indefinitely.

Rebates on top

Exemptions reduce chargeable income; rebates reduce the tax itself, and are announced Budget by Budget. For YA 2026 a corporate income tax rebate of 50% of tax payable applies, together with a S$2,000 cash grant for active companies that employed at least one local employee in 2025 — capped at S$40,000 in total benefit. Both are applied by IRAS automatically; there is nothing to claim. Because rebates are announced annually, check the current year's position rather than assuming this one repeats.

The two deadlines

1. ECI — an estimate of chargeable income, filed within 3 months of FYE. Most small companies are waived: revenue not more than S$5 million and nil ECI.
2. The return — Form C-S, C-S (Lite) or Form C, due 30 November of the Year of Assessment.

The YA labelling trips people up: income earned in FY ending 2026 is assessed in YA 2027. Your deadline tracker dates follow from your FYE automatically.

One principle underneath all of it, and worth internalising early: if you make money, expect to pay some tax. The legitimate goal is a fair amount through the exemptions and reliefs Parliament actually provided — the line between that and trouble is the subject of tax planning vs avoidance vs evasion.