Filing an income tax return: who files, when and how

6 min read · Before you start: Income tax, NIS and your payslip · Updated 3 November 2026

Key terms in this lesson: chargeable income · personal allowance (all defined in the glossary)

Most employees never see a tax return, because PAYE takes their income tax out of each pay cheque. But if you work for yourself, earn in more than one way, or think too much tax was deducted, a return is how the Board of Inland Revenue (BIR) works out what you really owe. This lesson walks through the steps. Rules, forms and deadlines change, so it is general education, and the BIR is the source to check.

Do you need to file?

According to the Ministry of Finance, individuals are generally not required to file income tax returns unless they are professionals or self-employed. In practice that points to people who:

Run a business, work for themselves or do gig work (see Side hustle and gig income).
Work in a profession where they are paid fees rather than a salary.

Employees can still file if they believe too much tax was deducted, to claim the difference back. Each person files separately, and PwC’s tax summary notes that spouses cannot file jointly. Budget 2027 materials also referred to mandatory electronic filing, so check with the BIR how the requirement applies to you for the year you file.

Other websites give different thresholds and penalty amounts, and some of them are out of date. When what you read conflicts, go to the BIR or the Ministry of Finance.

Before you start

A BIR file number. Everyone who pays tax, whether employed or self-employed, needs one. The Ministry of Finance page explains how to apply.
Your records for the year: payslips or employer statements, invoices and receipts for self-employed income, bank statements, and proof of anything you plan to deduct.
Identification: your ID and your file number, plus bank details if you are claiming a refund.

A habit that makes this easy: keep business money in its own account and file receipts as you go, so that the return is a matter of adding up rather than reconstructing the year.

What goes in the return

All your income for the year: salary, business income, rent and other sources.
Allowable expenses if you are self-employed: the costs of earning the income, with records to back them up.
The personal allowance: the amount of income that is not taxed. Its size changes with the budget, and our payslip lesson shows the figure reported for 2026.
Other deductions that the rules allow, within their limits.
Tax already paid through PAYE or instalments, which is subtracted from the tax you owe.

A simple example

Suppose a self-employed person earns TT$150,000 in a year after business expenses, has no other deductions, and uses the TT$90,000 personal allowance from our payslip lesson. Chargeable income is TT$150,000 − TT$90,000 = TT$60,000. At 25 percent, the tax is TT$60,000 × 0.25 = TT$15,000. Self-employed people pay in quarterly instalments, so that is roughly TT$3,750 a quarter. Both the allowance and the rate can change, so this shows the method, not your bill.

Paying, or claiming back

Instalments: according to the Ministry of Finance, self-employed people pay quarterly, by the last day of March, June, September and December.
A balance due: pay with a Payment Description Slip, available online or at a Cashiers’ Unit or District Revenue Office, using cash, cheque or Linx. Cashiers’ Units are open 8:00 am to 3:00 pm on weekdays, excluding public holidays.
A refund: if more tax was paid than you owe, the return is how you ask for it back. Keep your bank details ready.

Deadlines and help

Returns have generally been due by 30 April after the end of the tax year, but the BIR sets the date each year, so confirm it. Filing late can carry penalties, and the amounts reported differ between sources, so ask the BIR for the current figures. If you are unsure, file early and ask for help rather than waiting. The Inland Revenue Division offers free help with queries and completing returns, and technical officers assist at District Revenue Offices during the April and October filing periods. Its phone line is (868) 623-1211 to 14, open 8:00 am to 4:00 pm on weekdays.

Key ideas: Employees on PAYE usually do not need to file, but professionals and the self-employed generally do. Gather your records and your BIR file number first, then add up income, expenses, the allowance and tax already paid. A return can mean a balance to pay or a refund to claim. Confirm deadlines and penalties with the BIR.

Where sources differ, go to the source. Thresholds, deadlines, penalties and filing methods change, and unofficial sites often disagree. Read the Ministry of Finance page on paying your taxes and the PwC tax administration summary, and ask the BIR or an accountant about your own case.

Test yourself

Quick check 1 of 3

According to the Ministry of Finance, who is generally required to file an income tax return?

Quick check 2 of 3

When are self-employed instalments due, according to the Ministry of Finance?

Quick check 3 of 3

An employee thinks too much PAYE was deducted. What can they do?

Not financial advice. This lesson is general education only. See our editorial policy and disclaimer.