How to file your income tax return in Sri Lanka (2025/2026)

Filing your own income tax return in Sri Lanka is entirely doable online — you do not need an accountant for a straightforward return. The process is: get a Taxpayer Identification Number (TIN), activate an IRD e-Services account, gather your income and withholding certificates, complete the Return of Income (IIT) on the IRD portal, declare your income and reliefs, and pay any balance before the deadline. This guide walks through each step in order for the Year of Assessment 2025/2026.

Who needs to file an income tax return?

You generally need to file an individual income tax return if you are a resident with assessable income above the personal relief threshold of LKR 1,800,000 for the year, if you carry on a business or profession, or if the IRD has issued you a TIN and asked you to file. Even when your employer has deducted tax at source through APIT, you may still need to file a return to reconcile your total income, claim reliefs, and recover any over-deduction.

If you are unsure whether you must file, it is safer to register and file a return — including a NIL return where you have no tax to pay — than to risk a non-filing penalty.

Step 1: Register for a TIN

Every taxpayer needs a Taxpayer Identification Number (TIN). If you do not already have one, you can register:

• Online through the IRD website's taxpayer registration service, or
• In person at a regional IRD office, bringing your National Identity Card (NIC).

Your TIN is the identifier you will use for every interaction with the IRD, including logging in to file.

Step 2: Activate your IRD e-Services account

Filing is done electronically. Under section 113(1B) of the Inland Revenue Act, No. 24 of 2017, individuals are required to file their returns online, so you need an active e-Services account on the IRD portal (www.ird.gov.lk).

Register for e-Services to receive your access credentials (your TIN plus a password). If you have filed before, use your existing login. Keep these credentials secure — they give access to your full tax record.

Step 3: Gather your documents

Filing is fastest when everything is in front of you. Collect the following before you log in:

Each of these either adds to your income or gives you a tax credit that reduces what you owe — so none of them should be left out.

Step 4: Log in and open the Return of Income (IIT)

Sign in to the IRD e-Services portal with your TIN and password. Navigate to the return-filing section and open the individual income tax return (Return of Income) for the Year of Assessment 2025/2026.

The return is organised into the main form plus supporting schedules — for example, separate schedules for employment income, investment income, and tax credits. You complete the schedules first; the totals flow up into the main computation.

Step 5: Declare income, reliefs and tax credits

Work through the return in this order:

1. Income — enter income from every source: employment, business or profession, and investment income (interest, dividends, rent). Foreign income is converted to rupees at the applicable rate.
2. Reliefs — claim the personal relief of LKR 1,800,000 and any qualifying payments you are entitled to, such as approved donations and the solar relief. Reliefs reduce your taxable income before tax is calculated.
3. Tax credits — record tax already paid on your behalf: APIT deducted by your employer and WHT deducted on interest, dividends and rent. These come straight off your tax bill.

The portal computes the progressive tax on your taxable income and nets off your credits to show a balance payable or a refund.

Step 6: Submit and pay any balance

Review the computed figures carefully, then submit the return electronically. If tax is payable, settle it through the portal or an approved bank using your payment voucher / TIN. Always download and keep the acknowledgement the IRD issues — it is your proof of filing.

Key dates for Y/A 2025/2026

Self-employed taxpayers also pay tax in quarterly instalments during the year; the final return reconciles those payments against the full-year liability.

What happens if you file late

Filing after the deadline, or not filing at all, can trigger penalties from the IRD, and interest accrues on unpaid tax. The cost of a late or missed return is almost always higher than the effort of filing on time — so calendar the 30 November date and prepare early.

Where TaxWise fits in

TaxWise does the hard part — the calculation and the schedules. You enter your income once; the engine applies the 2025/2026 rates and reliefs, matches your APIT and WHT credits, and produces IRD-ready schedules you can follow line by line when completing the official return. TaxWise does not submit the return for you: you file it yourself on the IRD e-Services portal, which keeps you in control and compliant.

A note on the figures

The thresholds and rates above are for the Year of Assessment 2025/2026 under the Inland Revenue (Amendment) Act, No. 02 of 2025. Tax law changes, and the IRD issues circulars during the year — always confirm the current figures against the official IRD guidance or your live TaxWise computation before you file.