What is a TIN

What it actually is

Think of it like an NIC number, but for tax.

Every taxpayer gets a unique TIN from the Commissioner-General of Inland Revenue. It goes on your tax return, on any correspondence with IRD, and on tax-related documents.

Having a TIN doesn't mean you owe tax. It's an identifier, not a bill. Plenty of people have a TIN and pay nothing.

Who needs one

• If you're required to file a tax return, you need to register. The law gives you 30 days after the end of the relevant period to do it.
• Every company registered in Sri Lanka must register within 30 days of incorporation.

If you're not sure whether you need to file, that's worth settling first, because the answer decides whether this applies to you.

You might already have one

A lot of people assume they've never had anything to do with IRD, so they can't possibly have a TIN. Often that's wrong.

The Commissioner-General can assign a TIN to someone who isn't a taxpayer at all. That includes people who may be required to file a return, and people making payments that are taxable in someone else's hands. You don't have to apply for it, and you won't necessarily be told it happened.

Banks are a common route into this. They deduct tax on the interest they pay you and report it to IRD, so IRD often already holds your details.

Before you register, check whether you already have one. Call the IRD call centre on 1944 with your NIC, or ask at the Taxpayer Services Unit. Applying again when a TIN already exists just creates a mess to untangle later.

Where you'll be asked for it

This is the change most people are noticing.

From 1 April 2026, a TIN certificate is required for these things, and the official handling your request is responsible for checking:

Both sides of a share transfer need one, buyer and seller.

This is why people who have never dealt with IRD in their lives are suddenly being asked for a TIN at the bank counter.

Your TIN is not a secret

The law now says explicitly that a TIN is not confidential information.

That matters practically. If a client, a bank, or a government office asks for your TIN, there's no reason to withhold it. It isn't sensitive in the way your NIC or bank details are.

How to get one

You can register through IRD e-services on the IRD website, or in person at the Taxpayer Services Unit.

What you need as an individual:

• Your NIC (or passport if you're a foreign national)
• Proof of address if your current address is different from the one on your NIC. A utility bill, bank statement, passbook, or Grama Niladhari certificate works
• Your business registration certificate, if you're registering a sole proprietorship at the same time

Where to go:

• In person. Primary Registration Unit, Inland Revenue Department, Sir Chittampalam A Gardiner Mawatha, Colombo 02. Open Monday to Friday, 8:30am to 4:00pm.
• By phone. The IRD call centre on 1944, Monday to Friday 9:00am to 7:00pm and Saturday 9:00am to 1:00pm.

A TIN and a PIN are not the same thing

Easy to mix up.

• Your TIN identifies you as a taxpayer.
• Your PIN is the login credential for IRD's e-services portal. You request it separately, after you have a TIN, and it's sent to your registered email.

You need both to file online.

Getting a TIN is step one, not the whole job

Registering gets you a number. It doesn't register you for a specific tax type, and it doesn't file anything on your behalf.

If you're at this stage, the useful question is whether you actually need to file at all. It takes about a minute to find out.