Timor-Leste Tax Filing Guide: ANI Portal, Deadline March 31 2026
Timor-Leste's tax filing system is managed by the Autoridade Nacional do Imposto (ANI). The annual tax filing deadline for both individuals and companies is March 31 following the tax year. Withholding tax returns are filed monthly. Here is how tax filing works in 2026.
The Autoridade Nacional do Imposto (ANI) operates Timor-Leste's tax administration system. Tax returns can be filed electronically through the ANI online portal or in person at ANI offices in Dili and district centers. The tax year follows the calendar year (January 1 to December 31). All tax returns, payments, and correspondence are handled through the ANI system. Taxpayers must register for a tax identification number (NIF). Personal tax overview →
Real-world example: A freelance consultant earning USD 30,000 in 2025 must file their annual personal tax return by March 31, 2026. They submit their return through the ANI portal, declare their income and deductions, and pay any balance due. An employee with only salary income where tax was fully withheld generally does not need to file. A company with USD 500,000 turnover files CIT by March 31 and monthly withholding tax returns by the 15th of the following month. Residency and tax obligations →
Filing Deadlines 2026
- Annual income tax (individuals and companies): March 31 following the tax year (e.g., 2025 return due by March 31, 2026)
- Withholding tax (monthly): By the 15th of the following month
- Customs declarations: At the time of import/export
If a deadline falls on a weekend or public holiday, it typically shifts to the next business day. The ANI publishes annual tax calendars.
ANI Tax Administration
The ANI tax system includes:
- Registration: Taxpayer registration (NIF) for individuals and companies, required before business operations
- Filing: Submission of annual tax returns and monthly withholding tax returns
- Payment: Tax payment via bank transfer or in person at authorized banks
- Certificates: Tax clearance certificates, certificates of residency
The system is available in Portuguese, Tetum, and English. The ANI is gradually expanding its online services and electronic filing capabilities.
Penalties for Late Filing and Payment
- Late filing: Fines and penalties apply, calculated based on the delay period and tax amount
- Late payment: Interest accrues on the unpaid tax amount at the statutory rate
- Non-filing: Penalties for failure to file without reasonable cause
- Incorrect filing: Penalties for understatement of tax liability
Voluntary disclosure before an ANI audit may result in reduced penalties. The ANI may offer payment installment arrangements for taxpayers unable to pay in full.
Record Keeping Requirements
Taxpayers must maintain records for a minimum of 5 years from the end of the tax year. Required records include: accounting books and records, invoices and receipts, bank statements, contracts, payroll records, tax returns and correspondence with ANI. Electronic records are acceptable provided they are accessible and printable. Failure to maintain adequate records can result in penalties.
Do I need a tax agent or accountant to file?
Individuals with simple tax affairs can file themselves. Businesses, self-employed individuals, and taxpayers with complex affairs are strongly advised to use a licensed tax professional. The tax system is relatively simple, but professional advice ensures compliance.
What happens if I cannot pay my tax bill on time?
If you cannot pay by the deadline, you should file the return on time to avoid late filing penalties. Then contact the ANI to arrange a payment plan. Interest will continue to accrue on the unpaid amount.