Personal Income Tax Calculator Sri Lanka

Personal Income Tax Calculator Sri Lanka

Estimate your annual personal income tax by adding salary, business income, rent, FD interest, and other income in one place.

Enter your annual income details

Add your income for the tax year. This calculator estimates your total income, personal relief, taxable income, annual tax, and possible balance after tax already deducted.

Example: monthly salary × 12. Enter gross annual employment income before tax.
Enter profit after business expenses, not total sales.
Enter total rent received for the year before applying rent relief.
Most users should use the 25% rent relief option.
Enter total interest before tax deducted by bank.
Use this for other taxable income not listed above.
Optional. Add salary tax already deducted and bank tax already deducted from interest.
Total Income Entered LKR 0
Rent Relief / Deduction LKR 0
Total Income After Rent Relief LKR 0
Personal Relief Used LKR 0
Taxable Income After Relief LKR 0
Estimated Annual Income Tax LKR 0
Tax Already Deducted LKR 0
Balance / Credit Estimate LKR 0
Average Monthly Tax LKR 0
Effective Tax Rate 0.00%
Enter your income details and click Calculate.
This calculator estimates personal income tax using normal progressive tax slabs. Special income types, exemptions, tax credits, losses, foreign income, and capital gains may need separate treatment.

Calculation breakdown

This table updates after you click Calculate.

Calculation step Formula / basis Estimated amount
Salary / employment income Annual amount entered LKR 0
Business / self-employment profit Annual amount entered LKR 0
Rent received before relief Annual amount entered LKR 0
Rent relief / deduction 25% of rent received LKR 0
Rental income after relief Rent received − rent relief / deduction LKR 0
FD / bank interest Annual interest before bank tax LKR 0
Other income Annual amount entered LKR 0
Total income after rent relief Salary + business + rental income after relief + FD interest + other income LKR 0
Personal relief used Up to LKR 1,800,000 LKR 0
Taxable income Total income after rent relief − personal relief LKR 0
Estimated annual income tax Progressive individual income tax slabs LKR 0
Tax already deducted Amount entered by user LKR 0
Balance / credit estimate Estimated annual tax − tax already deducted LKR 0

Understanding personal income tax

What income should you include?

Include income such as salary, business profit, rental income, bank interest, and other taxable income. This calculator combines them to estimate your annual personal income tax.

What is personal relief?

Personal relief is the amount of income that may be deducted before calculating tax. This calculator uses LKR 1,800,000 personal relief for the year.

Why does tax already deducted matter?

Your employer or bank may have already deducted tax during the year. This calculator lets you enter that amount to estimate whether you may still have a balance to pay or a possible credit.

Formula used

  1. Total Income Entered = Salary + Business Profit + Rent + FD Interest + Other Income
  2. Rental Income After Relief = Rent − 25% Rent Relief, unless already entered after relief
  3. Total Income After Rent Relief = Salary + Business Profit + Rental Income After Relief + FD Interest + Other Income
  4. Taxable Income = Total Income After Rent Relief − Personal Relief
  5. Annual Tax = Tax calculated using progressive individual income tax slabs
  6. Balance / Credit = Annual Tax − Tax Already Deducted
This calculator is for educational estimates only. It does not replace IRD guidance, tax return filing, accounting advice, legal advice, or professional tax advice.
Source note: This calculator uses the 2025/2026 personal relief and normal individual income tax slab structure published by the Inland Revenue Department of Sri Lanka.