Income tax calculator Sri Lanka
Use this when you file your income tax return or want to check what you owe for the year of assessment, which runs from 1 April to 31 March.
Add your employment income and your other income, such as business profits, rent or interest. Then enter the APIT and advance income tax already taken from you to see the balance.
How it's calculated
- Your assessable income is everything you entered. The personal relief of Rs. 1,800,000 comes off first.
- The rest is your taxable income. The first Rs. 1,000,000 is taxed at 6%, the next slices at 18%, 24% and 30%, and anything above Rs. 2,500,000 at 36%.
- Tax already paid during the year is credited. If it is more than the tax, the difference is shown as paid in excess.
An example
With Rs. 3,600,000 of salary, the taxable income is Rs. 1,800,000. The tax is Rs. 150,000 on the first Rs. 1,500,000 plus 24% of Rs. 300,000, so Rs. 222,000 for the year.
Frequently asked questions
When is the income tax return due?
The IRD sets 30 November after the end of the year of assessment as the due date for the return.
Do I pay tax in instalments?
If you are an instalment payer, yes: by 15 August, 15 November, 15 February and 15 May, with the final payment after the year closes.
Are capital gains and gratuity taxed here?
No. Gains from selling investment assets and terminal benefits such as a retiring gratuity have their own rates. Use the capital gains tax and gratuity tax calculators for those.
Key terms
- Year of assessment
- The tax year, from 1 April to 31 March of the next year.
- Personal relief
- The amount every resident individual, and every non-resident citizen, can deduct before tax.
- Taxable income
- Assessable income less the personal relief and other allowed reliefs.
Up-to-date official data
Data checked against the official source on .
We check the official sources automatically, every day.
- Inland Revenue DepartmentInland Revenue (Amendment) Act, No. 2 of 2025
- Inland Revenue DepartmentIncome Tax (IT): personal relief