How to Appeal a Tax Assessment in Sri Lanka

An assessment lands in your inbox and the number at the bottom is bigger than the one you calculated. Maybe much bigger. Your first instinct is probably to call someone and argue about it.

Don't. Not yet.

Sri Lankan tax law gives you a real, structured route to challenge an assessment you believe is wrong. But it runs on short deadlines, it puts the burden of proof squarely on you, and it contains one rule that catches almost everybody. Getting the sequence right matters more than being right about the underlying tax.

Here's the whole route, in order.

What is a tax assessment, and how far back can the IRD go?

An assessment is the Inland Revenue Department's formal statement of what it says you owe. It might replace a figure you filed yourself, or fill a gap where you filed nothing at all.

The Assistant Commissioner can amend an assessment, but not forever. Section 135(2)(b) of the Inland Revenue Act sets the limit at thirty months. That clock runs from the date you filed your self-assessment return, or, for any other assessment, from the date notice of the assessment was served on you.

There's a large exception. Section 135(2)(a) allows amendment "in the case of fraud, or gross or wilful neglect by, or on behalf of, the taxpayer, at any time." No time limit at all.

So the first thing to check is whether the assessment is in time at all. If it falls outside the applicable window and nobody is alleging fraud or wilful neglect, that alone is a ground.

What is the first step if I disagree with my tax assessment?

You request an administrative review. Section 139(1) puts it plainly: a taxpayer who is dissatisfied with an assessment or other decision may request the Commissioner-General to review the decision.

You cannot skip this. Section 140(2) bars an appeal to the Tax Appeals Commission unless a request for administrative review has first been made. The review is the gateway to everything that follows.

Section 139(2) sets the terms:

"A request for review shall be made to the Commissioner-General in writing not later than thirty days after the taxpayer was notified of the decision, and shall specify in detail the grounds upon which it is made."

Three things are doing work in that sentence. It must be in writing. It must be within thirty days of notification. And it must specify in detail the grounds.

What must my request for administrative review actually say?

"Specify in detail the grounds" is the statutory test, and detail is the operative word. A letter saying you think the figure is too high is not a ground. It's a complaint.

A ground identifies what specifically is wrong and why. In practice that means going line by line:

• Which items of income has the assessment included that shouldn't be there, and what's the evidence
• Which deductions or expenses were disallowed, and on what basis you say they qualify
• Which reliefs or qualifying payments were left out
• Where the arithmetic differs from yours, and what your own figure is
• Any procedural point, such as the assessment falling outside the Section 135 time limit

There's a second requirement that trips up people who never filed in the first place. Section 139(3):

"Where the request for review is an objection against an assessment which has been made in the absence of a return or annual statement required to be furnished, such request shall be sent together with a duly filled return or annual statement, as the case may be."

So if the IRD assessed you precisely because you didn't file, you can't just object. You have to file the return alongside the objection. If that's your situation, our guide on filing your first tax return in Sri Lanka walks through what goes into it.

Do I still have to pay the tax while I'm disputing it?

This is the rule almost everyone gets wrong, and it's expensive.

Lodging a review or an appeal does not stop the IRD collecting. Section 142 is titled "Appeals do not suspend collection of amounts" and reads:

"Notwithstanding that a request for administrative review of an assessment has been filed or a taxpayer has appealed to the Tax Appeals Commission against an assessment, the tax payable under the assessment shall remain due and payable, unless the Commissioner-General grants an extension of time under section 151 and may be recovered, despite the request for review or appeal."

Read that carefully. The tax stays due. It can be recovered. The only relief is an extension of time under Section 151, and you have to apply for it separately. Objecting does not get you one automatically.

How the extension works

Section 151(1) says you apply on a form specified by the Commissioner-General. Section 151(2) then gives the Commissioner-General power, with good cause, to extend the time for payment pending resolution of an appeal, and to make other arrangements including payment by instalments or the furnishing of security.

There's a quietly generous provision at Section 151(3). If the Commissioner-General doesn't notify you of a decision, in writing or by electronic means, within thirty days, the application is deemed to be granted. Silence works in your favour here, which is unusual in tax law.

Two catches. Section 151(5): default on any instalment and the whole outstanding amount becomes payable immediately. And Section 151(4): "Where a taxpayer has been granted an extension under subsection (1), interest shall be payable notwithstanding the extension of time."

What an extension does and doesn't protect you from

Interest and penalty behave differently, and the difference is worth getting exactly right.

So an extension buys you protection from the 20% penalty, not from interest. Note also that Section 179(3) relieves only the subsection (1) penalty. The separate 10% penalty on an unpaid instalment under Section 179(2) is not covered by that relief.

One more detail that bites on amended assessments. Section 157(2) provides that where tax is due under a revised assessment, the due date for calculating interest is the original due date. Interest on a reassessment doesn't start when the new notice arrives. It backdates.

What this costs in real money

Say the IRD assesses you for an extra Rs. 480,000 and your dispute takes ten months to resolve. You lose.

• Interest: 1.5% of Rs. 480,000 is Rs. 7,200 for each month or part month. Over ten months, roughly Rs. 72,000.
• Section 179(1) penalty: 20% of Rs. 480,000 is Rs. 96,000.

Pay nothing and lose, and you're looking at about Rs. 648,000 on a Rs. 480,000 assessment. Apply under Section 151, get the extension, and the Rs. 96,000 penalty falls away while the interest still runs, bringing it to about Rs. 552,000.

These figures are illustrative, since Section 159(1) specifies the interest is computed monthly and the IRD's own computation governs. The point holds regardless: the extension application costs you a form and saves you the penalty.

What happens after the Commissioner-General receives my request?

Section 139(4) requires the IRD to acknowledge receipt of every request within thirty days. That acknowledgement matters more than it looks. The date on the acknowledgement letter is deemed to be the date your request was received, which is the date every subsequent clock runs from. Keep it.

Your request is then considered by a different tax official, per Section 139(5)(b), and the Commissioner-General notifies you of the decision and the reasons for it.

Then there's the two-year rule at Section 139(5)(c), added by the 2023 amendment:

"The Commissioner-General shall... notify his decision and the reason for the decision... within a period of two years from the date on which such request for review is received... Where such decision is not notified within such period, the request for review shall be deemed to have been allowed, unless an appeal has been preferred to the Tax Appeals Commission."

If the review goes quiet for two years, it's deemed allowed in your favour. Under Section 139(6), the Commissioner-General gives effect to whatever the decision is by confirming the existing assessment, or making an amended assessment (including for a nil amount), or an additional assessment.

How do I appeal to the Tax Appeals Commission?

If the review decision doesn't resolve things, Section 140(1) lets a person aggrieved by that decision appeal to the Tax Appeals Commission.

Section 140(5) sets the mechanics. Notice of appeal is given in writing to the Tax Appeals Commission with a copy to the Commissioner-General, within thirty days from the date of the Commissioner-General's decision under Section 139.

There's also an escape hatch for a review that stalls. Section 140(2) says an appeal can't be made unless a review was requested first and either:

• (a) a decision has been received from the Commissioner-General, or
• (b) ninety days have lapsed since the request for administrative review was made

You don't have to wait two years to move. Ninety days after lodging your review, the door to the Commission opens whether or not anyone has replied. (This was seven months before 1 April 2021, so older guidance you find online may be out of date.)

The Commission has real powers. Section 140(3) allows it to reduce an assessment where you were overcharged, increase it where you were undercharged, or confirm or annul it. Section 140(4) allows it to require you to furnish security for payment where it's satisfied the tax might not otherwise be recovered.

Can I take it further than the Tax Appeals Commission?

Yes, but the door narrows considerably.

Section 144(1) allows either party who is dissatisfied with the Commission's decision to file a notice of appeal with the Court of Appeal within one month after being notified of the decision, serving a copy on the other party. Note that it's one month, not thirty days.

The critical limit is Section 144(3):

"An appeal from a decision of the Tax Appeals Commission to the Court of Appeal shall be made only on a question of law."

You cannot re-argue the facts. If the Commission found that a payment wasn't a deductible business expense as a matter of fact, that finding stands. What you can challenge is whether it applied the law correctly to those facts. Section 144(4) requires the Commission to provide a written statement of its decision including a summary of the evidence, its findings of fact, and its conclusions on the points of law, which is the document your legal argument is built on.

This is the stage where you need a tax lawyer, not a checklist.

What if I miss the thirty-day deadline?

You may still have a route, depending on why you missed it.

Section 139(8) allows a late request for administrative review where you satisfy the Commissioner-General that "owing to absence from Sri Lanka, sickness, or other reasonable cause" you were prevented from making the request in time, "and that there has been no unreasonable delay" on your part. Section 140(6) gives the Tax Appeals Commission an equivalent discretion for a late appeal.

Note what's not on that list. Being busy isn't there. Not having opened the letter isn't there. "Other reasonable cause" carries some flexibility, but you're asking for a discretion to be exercised in your favour, and the provision reads as one meant for genuine incapacity.

If nothing applies, Section 143(1) makes the assessment final. There's one narrow route left: Section 143(2) provides that where an assessment has become final and you then timely file an amended return under Section 136, the amended return revises the assessment, but only if the tax shown on the amended return exceeds the tax assessed. In other words, that provision lets you correct an assessment upward, not downward. It is not a way back in.

If you're trying to correct something you got wrong yourself rather than dispute the IRD's figure, the process is different, and our guide on amending a tax return in Sri Lanka covers it.

Who has to prove the assessment is wrong?

You do, and this shapes everything above.

Section 141 states it in a single line: "The burden of proof shall be on the taxpayer or person making an objection to an assessment to show that the assessment is incorrect."

The IRD doesn't have to demonstrate its number is right. You have to demonstrate it's wrong. An assessment you dispute with conviction but no documentation is an assessment you lose.

So the dispute is really won or lost long before the assessment arrives, in how you kept your records. Bank statements matched to invoices, receipts for every expense claimed, a clear trail from your bookkeeping to the figure on your return. Our guide to tax record keeping in Sri Lanka covers what to hold and for how long, and if you're working with a professional, the documents your tax agent needs helps you assemble a file quickly.

The other half is being able to show your own working. "Specify in detail the grounds" is far easier when you can point to how you arrived at each line rather than reconstructing it under deadline pressure. To check your own figure against the assessment first, start with how to calculate income tax in Sri Lanka.

What is the full appeal route, start to finish?

Two things to carry away. First, the thirty-day clock starts when you're notified, not when you get around to reading it, and Section 143 closes the door permanently when it runs out. Second, disputing an assessment and paying it are separate tracks. If you only do the first, interest and a 20% penalty accumulate quietly behind a dispute you might well win.

Lodge the review. Then apply under Section 151 the same week. They're two different letters, and you need both.

If the assessment relates to tax you now accept you owe, paying income tax to the IRD sets out the practical options, and the 2026 penalty changes are worth knowing before you decide how long to leave it.