Personal Income Tax Calculator Sri Lanka

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Personal Income Tax Calculator Sri Lanka

Estimate your annual personal income tax by adding salary, business profit, rental income, fixed deposit interest, and other taxable income in one place.

Enter your annual income details

Add your income for the tax year. This calculator estimates 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, unless you choose the already-net option below.
Most users should start with the simple 25% rent relief option.
Only used if you select actual rental expenses.
Enter annual fixed deposit or bank interest before any tax deducted by the 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
Rent relief / deduction
Total income after rent relief
Personal relief usedAmount deducted before calculating tax
Taxable income after relief
Estimated annual income taxBefore subtracting tax already deducted
Tax already deductedAmount entered by user
Balance / credit estimate
Average monthly taxAnnual tax divided by 12
Effective tax rateAnnual tax ÷ total income entered
This calculator estimates normal personal income tax using progressive individual tax slabs. Special income types, exemptions, tax credits, losses, foreign income, and capital gains may need separate treatment.

Calculation breakdown

This table updates instantly while you type.

Calculation stepFormula / basisEstimated amount

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 part of your annual income that is deducted before calculating normal income tax. This calculator uses LKR 1,800,000 as the personal relief amount.

Why does tax already deducted matter?

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

Formula used

  1. Total Income Entered = Salary + Business Profit + Rent + Fixed Deposit Interest + Other Income
  2. Rental Income After Relief = Rent − 25% Rent Relief, unless actual expenses or net income are selected
  3. Total Income After Rent Relief = Salary + Business Profit + Rental Income After Relief + Fixed Deposit 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
Educational estimate only. This calculator does not replace IRD guidance, tax return filing, accounting advice, legal advice, or professional tax advice.
Source note: This calculator uses the Sri Lanka Inland Revenue Department 2025/2026 personal relief and normal individual income tax slab structure.
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