How to Pay Income Tax to the IRD in Sri Lanka

You've done the hard part. You know what you owe and the rupees are sitting in your account. Now you just need to hand it over.

That should be the easy bit, and usually it is. But a payment can go wrong in ways that don't announce themselves. The money leaves your account, you assume you're square with the IRD, and months later you find it was applied to something else entirely. You're still liable, and penalties have been accruing the whole time.

This article is about the part of paying tax that the law actually governs. Not which button to click, but what makes a payment count.

How do I actually pay my income tax to the IRD in Sri Lanka?

The Inland Revenue Act answers this in a single line. Section 145(3):

"Tax shall be paid in the manner and place specified by the Commissioner General."

That's it. That's the whole statutory rule on how you pay.

It looks like a dodge, but it's deliberate. Parliament didn't write bank names or portal URLs into the Act, because those change. Section 113(1) backs this up from the other direction: it lets the Commissioner-General authorise, among other things, "the payment of tax under this Act" to be done electronically through a computer system or mobile electronic device. Section 113(2) goes further and lets the Commissioner-General direct a person to do it electronically.

So the authoritative answer to "which channels can I use, and what reference do I quote" is always the IRD's own current payment instructions. Not a blog post, including this one.

One thing the Act does fix is currency. Section 155: "Tax shall be payable in Sri Lanka currency, except as otherwise provided in this Act." If you earn in dollars, you're still settling in rupees.

Which tax am I paying, and why does that change the deadline?

Before you can pay correctly, you need to know which of three routes your money is travelling on. Section 82(1) sets them out:

"Tax imposed under section 2 shall be payable by withholding under Division II, by instalment under Division III or on assessment under Division IV."

These aren't alternatives you pick between. Most people are on more than one at once, and each carries its own deadline.

The quarterly instalment dates under Section 90 are August 15, November 15, February 15 of the year of assessment, and May 15 of the next one. Our guide to quarterly tax payments covers how the instalment amount is worked out, and if you've fallen behind on those, the catch-up process is a separate piece.

Whether you're an instalment payer at all depends on your circumstances. If nobody withholds tax from your income, paying income tax with no employer walks through when your payments fall due.

Every payment you make belongs to exactly one route and one period. Which brings us to the part that costs people money.

What happens if I don't tell the IRD which period my payment is for?

This is the single most important rule in this article, and almost nobody knows it.

Section 154(2):

"The Commissioner-General may apply a tax payment to any tax which has been assessed and is due (a) where the taxpayer fails to indicate to which specific tax or taxation period the payment should be applied."

Read that again. If you don't say what the money is for, the IRD gets to decide. And it can pick any tax that has been assessed and is currently due, not the one you had in mind.

There's a second rule stacked underneath it. Section 154(1) governs how a payment is applied within a given tax:

"Payments of a specific tax shall be applied against the taxpayer's liability in the following order: (a) interest relating to the tax; ... (c) the principal amount of the tax."

Interest gets cleared first. The tax itself gets cleared last. So a part payment doesn't reduce your tax bill by what you paid, because some of it was eaten by interest on the way in.

Here's how that plays out with real numbers.

Nimali has an older assessed liability she's been meaning to deal with: Rs. 280,000 of tax with Rs. 42,000 of interest on it. Separately, her first quarterly instalment for 2026/2027 is Rs. 250,000, due August 15.

She transfers Rs. 250,000 on August 14, intending it as the instalment, without indicating the tax type or the period.

Under Section 154(2), the Commissioner-General may apply that payment to the older liability, because it's assessed and due. Under Section 154(1), it clears the interest first:

Her instalment is entirely unpaid. Fourteen days after August 15, Section 179(2) adds a penalty of ten per cent of it, which is Rs. 25,000, and Section 157 interest starts running too. She's Rs. 250,000 poorer and she's picked up a penalty.

Nothing here was unlawful or even unusual. The IRD applied the money exactly as the Act permits. The only thing Nimali got wrong was failing to say what the payment was for.

When is my income tax payment actually due?

Most people assume the tax is due when the return is due. It isn't, and the gap is two months wide.

Section 82(2)(c)(ii) sets the payment date for tax on assessment:

"on the date that is six months after the end of the year of assessment for which a return of income shall be filed under section 93"

Section 93(1) sets the filing date:

"every person shall file with the Commissioner General not later than eight months after the end of each year of assessment a return of income for the year."

The year of assessment ends on March 31. So for 2025/2026:

You pay two months before you file. Which means calculating your liability well before the return that documents it is due.

Capital gains work differently again. Under Section 82(2)(c)(i) the tax is payable on the date the capital gains tax return is due, and Section 93(3), as substituted with effect from April 1, 2021, requires that return within thirty days after the end of the calendar month in which the realisation occurred. So a sale in early May runs to the end of June, not six months out. Some older guidance still quotes the pre-2021 rule of one month from the realisation itself, which is a shorter window than the law now allows.

One small mercy is in Section 119(1). If the last day for doing something falls on a day the Department isn't open to the public, you're timely if you do it on the next day it is open.

What proof of payment should I keep, and for how long?

Section 120(5) requires you to retain "source documents and underlying documentation" behind your records, and Section 120(10) spells out what counts. The list includes invoices, contracts, delivery notes, and, directly relevant here, bank statements.

How long? Section 120(6):

"(a) for a period of five years from the date on which the transaction took place; or (b) for a period exceeding five years, until expiration of the time limit for assessment of tax for any tax period to which the records are relevant and until any related proceedings have been completed."

So five years is the floor, not the ceiling. If the assessment window for that year is still open, or there's a dispute running, the clock doesn't stop at five.

For a payment, keep three things together: the receipt or acknowledgement the channel gave you, the bank statement line showing the money leaving your account, and your own note of which tax and period you designated it for. That third item is the one people skip, and it's the one that matters if the payment is ever applied somewhere unexpected. Our record keeping guide covers what else to hold and for how long.

How do I check that my payment was applied to the right year?

You don't have to guess, and you don't have to rely on goodwill. Section 118 gives you a statutory right:

"Upon request by a taxpayer, an authorized officer of the Department shall (a) inform the taxpayer of the status of the taxpayer's account with respect to tax; (b) provide a copy of a tax return filed by the taxpayer; and (c) provide a copy of any written agreement entered into with the Commissioner General."

Note the word "shall". This isn't a favour. Ask an authorised officer for the status of your account and they're required to tell you.

Use it. The natural moments are a few weeks after a payment, and again before you file, so what you believe you've paid and what the IRD's records say are reconciled before the balance is calculated. If the two disagree, you want to know in September, not in a notice of assessment two years later.

None of this tracking works without a TIN, because your account is what your payments attach to. Our TIN guide covers registration.

What does it cost me if the payment lands late?

Two separate charges, and they stack.

Penalty, under Section 179. Subsection (1): failing to pay tax for a tax period within fourteen days of the due date makes you "liable to a penalty equal to twenty per cent of the amount of tax due but not paid". Subsection (2) applies a lower rate to instalments, at ten per cent of the amount due but not paid, on the same fourteen day trigger.

Interest, under Section 157. Subsection (1): if tax isn't paid by the due date, you're liable for interest "for the period from the due date ... to the date the tax is paid". Section 159(1) sets that rate at one and one half per cent per month or part month, computed monthly. Section 159(3) lets the Minister vary that rate by Order published in the Gazette, so confirm the current figure before relying on it.

Take a Rs. 250,000 instalment due August 15 and paid on November 20:

That's sixteen per cent on top, for being three months late on one instalment.

If you genuinely can't pay on time, Section 151 lets you apply for an extension, and it's worth knowing exactly what that buys you. Section 179(3) means you aren't liable to the subsection (1) penalty unless the extension expires without payment. But Section 157(1) calculates interest from the due date "determined without having regard to an extension of time under section 151", and Section 151(4) confirms interest is payable notwithstanding the extension.

What if I paid too much, or into the wrong period?

Overpaying isn't a disaster, but the money doesn't automatically come back to you either. Section 150(1) sets out what the Commissioner-General does with an excess:

"(a) refund the amount against the taxpayer's assessed liability or payable amount of tax, interest, late fees, or penalties under this Act; and (b) unless the taxpayer objects, apply an amount remaining against the taxpayer's liability to make advance payments of tax that shall become due within the succeeding six months; or (c) at the request of the taxpayer, set off sixty percent of the refundable amount against the subsequent income tax payable by the taxpayer, prior to a tax audit on the refund claim."

So the default path is offset first, then forward against the next six months of advance payments, and only what's left comes back as cash. Notice paragraph (b) says "unless the taxpayer objects", so the forward application happens by default unless you say otherwise.

That's the useful bit if a payment landed in the wrong period. An overpayment isn't lost. It's available to be applied against what you owe. Getting it moved or repaid is covered in how to claim a tax refund from the IRD, including the claim deadline, which is strict.

What should I do before I make my next payment?

Six things, in order:

1. Know which route you're on. Withholding, instalment, or on assessment. It determines the deadline.
2. Get the current payment instructions from the IRD, not from memory or from an article. Section 145(3) means the channels are whatever the Commissioner-General currently specifies.
3. Indicate the tax type and the exact period. Every time. This is the Section 154(2) trap, and it's entirely avoidable.
4. Pay early enough to clear. The Act doesn't define when a payment counts as made, so leave working days rather than transferring on the deadline.
5. Keep the receipt, the bank statement line, and your own note of the designation. Five years minimum under Section 120(6).
6. Check your account status a few weeks later under Section 118, and again before you file.

None of this is difficult. It's just that none of it is automatic, and the law puts the consequences of a vague payment on you rather than on the Department. Say what the money is for, keep the proof, and check that it landed.