Your company's estimated chargeable income for the year of assessment.
Corporate Tax
$16,575.00
Effective Rate
8.3%
Headline Rate: 17%
ECI filing required. Deadline: Within 3 months after end of financial year
What is ECI?
Estimated Chargeable Income (ECI) is an estimate of your company's taxable profits for a Year of Assessment (YA). Companies must file their ECI within 3 months of their financial year end. You can opt for GIRO instalments to spread payments over 10 months.
Partial Tax Exemption
All companies enjoy partial tax exemption: 75% exemption on the first S$10,000 of chargeable income, and 50% exemption on the next S$190,000. This means the effective tax rate on the first S$200,000 is significantly lower than the headline 17% rate.
Start-up Tax Exemption
Qualifying new companies in their first 3 YAs enjoy enhanced exemption: 75% on the first S$100,000 and 50% on the next S$100,000. To qualify, the company must be incorporated in Singapore and have no more than 20 shareholders.
IRAS-Aligned: Uses YA 2025 corporate tax rates. Consult IRAS or a tax professional for specific exemptions and incentives.
How to estimate your IRAS tax bill before the Year of Assessment
What is estimated tax and why does it matter?
Estimated tax is the amount of income tax you expect to owe IRAS for the year. Unlike employees who have tax withheld from their pay, self-employed people and businesses need to estimate and set aside money throughout the year. Getting the estimate right means no nasty surprises when your Notice of Assessment arrives.
How do you estimate your Singapore income tax?
Add up your expected income for the calendar year, subtract CPF contributions and tax reliefs, then apply the progressive tax rates. For example, if you expect net trade income of S$80,000 and have S$8,000 in CPF relief, your chargeable income is S$72,000. Using 2025 rates, your estimated tax would be about S$2,830.
What is the Estimated Chargeable Income (ECI) for companies?
Companies in Singapore must file an ECI with IRAS within three months after the end of their financial year. The ECI is your best estimate of the company taxable profit for that year. IRAS uses it to issue an early tax assessment. If your revenue is under S$5 million and the ECI is nil, you may be exempt from filing.
Can you pay estimated tax in instalments?
Yes. Individuals can apply for GIRO instalments to spread their tax payments over 12 months. Companies can also pay via GIRO. If you file your ECI early, you may get up to 10 monthly instalments. This helps with cash flow — instead of one large payment, you pay smaller amounts each month.
What happens if your estimate is too low?
If your actual income is higher than estimated, IRAS will send you a revised Notice of Assessment with a higher tax bill. There is no penalty for under-estimating in good faith, but you will need to pay the shortfall. For companies, if your ECI is significantly lower than actual profits, IRAS may question the accuracy of your filing.
What tax reliefs can reduce your estimated tax?
Common reliefs include: CPF contributions (up to S$37,740), Earned Income Relief (up to S$1,000 if under 55), SRS contributions (up to S$15,300), spouse relief (S$2,000), and NSman relief (up to S$5,000). These all reduce your chargeable income. For businesses, you can also claim capital allowances on equipment and the Productivity and Innovation Credit.
When is estimated tax due for self-employed individuals?
Self-employed individuals file their income tax return (Form B) by 15 April (paper) or 18 April (e-filing) of the Year of Assessment. IRAS then sends a Notice of Assessment, usually by May or June. Tax is due within one month of the notice. Setting up GIRO means payments start automatically without you having to remember deadlines.
IRAS-Aligned: Based on 2025 IRAS rates and thresholds. For personal advice, speak to a qualified tax professional.
Related Calculators
Company Tax Calculator
Calculate Singapore corporate tax at 17% with partial and startup exemptions from IRAS.
GST Calculator
Add or remove Singapore 9% GST. Calculate inclusive and exclusive amounts instantly.
Profit Projection Calculator
Project your 12-month revenue, expenses, and cumulative profit with growth rates.
Disclaimer: This calculator provides estimates based on current HMRC rates and thresholds for the 2025/26 tax year. It does not constitute professional tax, financial, or legal advice. Your actual liability may differ depending on your individual circumstances. Always consult a qualified accountant or tax adviser before making financial decisions. Read our terms