How this calculator works
- Choose whether you want to start from annual income or from a monthly income figure.
- The calculator applies the standard Sri Lanka resident personal relief first, then calculates tax on the remaining ordinary taxable income using the progressive annual bands.
- You can separately include extra deductions, capital gains, and qualifying foreign income to get a more realistic full-year tax estimate.
Worked example
For annual ordinary income of LKR 3,600,000.00, the calculator first removes the standard personal relief of LKR 1,800,000.00, then applies the progressive resident income tax bands to the balance.
Important assumptions
- This calculator uses the Sri Lanka resident individual tax chart for year of assessment 2025-2026.
- Capital gains are estimated at 10% and qualifying foreign or service-export income is estimated at 15% when entered.
- The monthly view is a convenience projection. The tax is still calculated on the annualized value because Sri Lanka resident income tax works on an annual basis.
FAQ
Are these calculators free?
Yes. lankacalculator tools are free to use and designed to be quick to access without sign-up.
How accurate are the results?
The calculators use clear assumptions and formulas, but results are estimates and should be checked against official documents or provider terms.
Can I use this on mobile?
Yes. The layout is built to work cleanly on phones, tablets, and desktops.
Do you store my inputs?
No account is required for these tools, and calculator inputs are not stored as user profiles in this v1 setup.