Corporate tax in Singapore, explained
Singapore taxes company profits at a flat 17%, among the lowest headline rates in the world, and startup and partial exemptions mean many SMEs pay an effective rate well below that. What trips companies up is rarely the rate. It's the filing obligations.
Every company has two mandatory filings each year:
- Estimated Chargeable Income (ECI): an estimate of taxable profit, due within three months of your financial year end. Many smaller companies qualify for a filing waiver, but that has to be checked rather than assumed.
- Corporate income tax return (Form C-S or C): the actual return, due by 30 November each year.
Both are prepared from your management accounts, which is why tax compliance is bundled into every one of our accounting packages.
Why timely filing matters
Miss the deadlines and the Inland Revenue Authority of Singapore (IRAS) doesn't wait. Late filing attracts penalties, and IRAS can issue an estimated assessment: its own guess at your profit, which is rarely in your favour and must be paid within a month even while you object. Persistent non-filing can escalate to summonses against the company and its directors.
We wrote up exactly how the penalty process works in our guide to corporate tax late-filing penalties. The short version: staying current is dramatically cheaper than catching up.
Who it's for
- Every Singapore company: ECI and an annual corporate tax return are mandatory filings.
- Companies whose bookkeeping is handled in-house or by another provider.
- Directors who have received IRAS reminders or late-filing notices and want it fixed.
What you get
ECI filing
Estimated Chargeable Income computed and filed with IRAS after your financial year end.
Corporate tax return
Yearly corporate income tax return (Form C-S/C) prepared and filed with IRAS.
IRAS correspondence
We track deadlines and handle routine IRAS queries relating to your filings.
How it works
Accounts in
We work from your management accounts: ours if you’re an accounting client, or yours if bookkeeping happens elsewhere.
Computation
Tax computation prepared, with applicable exemptions and reliefs applied.
File & confirm
ECI and the tax return are filed with IRAS and you receive confirmation for your records.
Timeline & Pricing
Timeline
ECI within 3 months of financial year end; tax return by 30 November.
Cost
Included in all accounting packages. Standalone tax compliance from S$450 per financial year when your bookkeeping is done elsewhere; compliance-only package with financial statements at S$1,120.
Pricing
| Within any accounting package | Included |
| Tax compliance add-onFor companies whose bookkeeping is done elsewhere. | S$450 / financial year |
| Essential Compliance packageUnaudited financial statements + ECI + tax return. | S$1,120 / year |
Exemptions and reliefs worth knowing
Singapore's headline 17% rate overstates what most SMEs actually pay, because two standing schemes reduce chargeable income before the rate applies:
- Start-Up Tax Exemption (SUTE): qualifying new companies get 75% of their first S$100,000 of chargeable income exempted and 50% of the next S$100,000, for each of their first three years of assessment.
- Partial Tax Exemption: after that (or where SUTE doesn't apply), 75% of the first S$10,000 and 50% of the next S$190,000 are exempt.
On top of these, the government announces corporate income tax rebates in some budget years. The practical takeaway: a profitable young company often pays an effective rate in the single digits, but only if the computation actually claims what it's entitled to. That computation is included in our accounting packages and the standalone tax add-on.
Deductibility is the other place money is left on the table or claimed incorrectly. Expenses must be revenue in nature and incurred in producing income, while items like private car expenses and fines are non-deductible regardless. Where the answer is grey, we tell you so before IRAS asks.
Filing yourself vs using a provider
You can file ECI and Form C-S yourself through the myTax portal, and for a very simple company that may be fine. The risk sits in the computation: capital allowances, non-deductible expenses, and the startup and partial exemptions all change the number, and mistakes surface later as IRAS queries or overpaid tax.
With Duellix, the computation and both filings are included in every accounting package. If your bookkeeping happens elsewhere, the standalone tax compliance add-on is a flat S$450 per financial year. The pricing page has the full picture.
Frequently Asked Questions
What are the deadlines?
ECI is due within three months of your financial year end (unless your company qualifies for a waiver), and the corporate income tax return is due by 30 November each year.
What happens if I file late?
IRAS imposes penalties and can estimate your tax for you, rarely in your favour. If you’re already behind, we prioritise bringing your filings up to date; see our guide on corporate tax late-filing penalties on the blog.
What is the corporate tax rate in Singapore?
A flat 17% on chargeable income. Startup and partial exemptions reduce the effective rate substantially for most SMEs, and many newly incorporated companies pay well below the headline rate in their first years.
What is ECI and does my company need to file it?
Estimated Chargeable Income is an estimate of your taxable profit, due within three months of your financial year end. Some companies qualify for a waiver (broadly: modest revenue and nil ECI). We check and file, or confirm the waiver, as part of every engagement.
Do dormant companies need to file tax returns?
Generally yes, unless IRAS has granted a waiver of the requirement. A dormant company isn’t automatically an exempt company. We can apply for the waiver where the conditions are met.