How Personal Income Tax Is Calculated in Sri Lanka
A simple guide to how annual personal income tax is estimated in Sri Lanka, including salary, business profit, rental income, fixed deposit interest, personal relief, rent relief, and progressive tax bands.
This guide uses publicly available Sri Lankan tax, IRD, Customs, Provincial Revenue, or government information available at the time of writing. Tax rates, thresholds, forms, exemptions, valuation treatment, import rules, and filing requirements can change. Always confirm final amounts with the relevant authority or a qualified professional before making financial, tax, legal, property, import, or business decisions.
What is personal income tax?
Personal income tax is the tax charged on an individual’s taxable income for a year of assessment. In Sri Lanka, this can include income from employment, business or self-employment, rent, investment income such as fixed deposit interest, and other taxable income.
A full personal income tax estimate is broader than a monthly salary tax estimate. Salary tax or APIT usually focuses on employment income, while personal income tax looks at your overall annual income position.
What income should you include?
A simple personal income tax estimate usually starts by adding the main types of annual income. The exact treatment can depend on your situation, but normal users can start by thinking about these common categories.
Simple calculation flow
The basic flow is to calculate total income, apply eligible deductions or reliefs, calculate taxable income, apply the tax bands, and then subtract any tax already deducted.
| Step | Simple explanation |
|---|---|
| 1. Add income | Add salary, business profit, rental income, FD interest, and other taxable income. |
| 2. Adjust rent | Apply rent relief or actual rental expenses where relevant. |
| 3. Apply personal relief | Deduct eligible personal relief before normal income tax is calculated. |
| 4. Calculate taxable income | Taxable income is the amount left after the relevant reliefs and deductions. |
| 5. Apply tax bands | Use progressive individual income tax rates to estimate annual tax. |
| 6. Subtract tax already deducted | APIT or bank tax already deducted may reduce the balance still payable. |
Personal relief
Personal relief is the amount deducted before calculating normal individual income tax. For the year of assessment 2025/2026, IRD shows personal relief of LKR 1,800,000 for eligible resident individuals and non-resident citizens.
This is why many basic calculators first annualize income, deduct personal relief, and then apply the individual income tax bands to the remaining taxable income.
Rental income and rent relief
Rental income can be part of your personal income tax calculation. A simplified estimate may use the 25% rent relief method, or actual expenses where the taxpayer is using an expense-based approach.
For example, if annual rent received is LKR 1,200,000 and the simple 25% rent relief method is used, the rent relief would be LKR 300,000 and the rental income after relief would be LKR 900,000.
2025/2026 individual income tax bands
Sri Lanka uses progressive tax bands for normal individual income tax. This means each portion of taxable income is taxed at the rate for that band.
| Taxable income band | Rate | Plain-English meaning |
|---|---|---|
| First LKR 1,000,000 | 6% | The first taxable portion after relief is taxed at 6%. |
| Next LKR 500,000 | 18% | The next taxable portion is taxed at 18%. |
| Next LKR 500,000 | 24% | The next taxable portion is taxed at 24%. |
| Next LKR 500,000 | 30% | The next taxable portion is taxed at 30%. |
| Balance | 36% | Any remaining taxable income above those bands is taxed at 36%. |
Because the rates are progressive, your highest tax band is not the same as your effective tax rate. The effective tax rate is the total tax divided by total income.
Example personal income tax estimate
Here is a simple example using multiple income types.
| Item | Amount |
|---|---|
| Annual salary | LKR 3,600,000 |
| Business profit | LKR 2,400,000 |
| Rent received | LKR 50,000 |
| FD interest | LKR 200,000 |
| Total income entered | LKR 6,250,000 |
| Less 25% rent relief on LKR 50,000 | LKR 12,500 |
| Total income after rent relief | LKR 6,237,500 |
| Less personal relief | LKR 1,800,000 |
| Taxable income | LKR 4,437,500 |
The calculator then applies the progressive tax bands to estimate annual income tax. If tax has already been deducted by an employer or bank, that amount can be entered separately to estimate the balance still payable.
Tax already deducted matters
If your employer deducted APIT or your bank deducted tax from interest, that does not mean you should ignore the income. In a full personal income tax estimate, you may still need to include the income and then separately include the tax already deducted.
This helps estimate whether you may still have a balance to pay, or whether your final tax position could be lower than the amount already deducted.
When a simple estimate may be wrong
A calculator is useful for planning, but personal income tax can become more complex when there are special income types or tax treatments.
- foreign income,
- capital gains,
- losses,
- exempt income,
- terminal benefits,
- partnership income,
- special tax rates,
- tax credits,
- withholding tax complications,
- non-cash benefits, and
- document-specific legal treatment.
Use the calculator
The Personal Income Tax Calculator helps you combine salary, business profit, rental income, fixed deposit interest, other taxable income, and tax already deducted into one simplified estimate.