Tonga Corporate Tax Guide: CIT 25% Standard Rate 2026
Tonga's Corporate Income Tax (CIT) regime features a standard rate of 25%. There are no reduced rates for small businesses or special economic zones. Tonga does not impose any turnover-based taxes or minimum corporate taxes. Here is how Tongan corporate tax works in 2026.
Corporate Income Tax in Tonga is governed by the Income Tax Act 2007 and administered by Tonga Revenue & Customs (TRC). The standard CIT rate of 25% applies to all resident companies on their worldwide income. Non-resident companies are taxed only on Tongan-source income. The tax year is the calendar year. Companies must file annual CIT returns by March 31 of the following year. Filing and compliance guide →
Real-world example: A Nuku'alofa-based trading company with annual turnover of TOP 2,000,000 and taxable profit of TOP 400,000 pays CIT at 25% = TOP 100,000. Compare this to Australia where the same profit would incur 25-30% CIT, or New Zealand at 28%. Tonga's 25% rate is competitive within the Pacific region. IT sector overview →
Corporate Tax Rate Structure
- 25% (standard): All resident companies — no reduced rates for small businesses
- No minimum tax: Tonga does not impose an alternative minimum tax or turnover-based tax
- No branch tax: No additional tax on branch profit repatriation
The 25% rate applies uniformly across all business sectors. There are no special regimes for specific industries.
Taxable Income and Deductions
Corporate taxable income is calculated as accounting profit adjusted for tax purposes. Key rules include:
- Depreciation: Standard rates apply — buildings 4%, machinery 10-20%, vehicles 20%, computers 30%
- Interest deductibility: Thin capitalization rules may limit interest deductions
- Loss carryforward: Tax losses can be carried forward for up to 5 years
- Capital gains: Treated as ordinary income and taxed at standard CIT rate
Transfer pricing rules apply for transactions with related parties. Tonga follows OECD guidelines for transfer pricing documentation. Cross-border taxation →
Withholding Taxes on Outbound Payments
Tonga imposes withholding tax on certain payments to non-residents:
- Dividends: 0% WHT — no withholding on dividends paid to non-residents
- Interest: 15% WHT on bank interest paid to non-residents
- Royalties: 10-15% WHT depending on the type of royalty
WHT rates may be reduced under Tonga's Double Taxation Treaties (mainly Australia and New Zealand). Investment income guide →
Tax Incentives
Tonga offers limited tax incentives compared to regional peers:
- No special economic zones: Tonga does not have designated tax-free zones
- No IT-specific incentives: No reduced CIT rates for technology companies
- Investment allowances: Limited capital allowances for certain qualifying investments
The government has discussed potential incentives for tourism and agriculture but none are currently legislated. IT sector guide →
Who needs to register for CIT in Tonga?
All legal entities (companies, partnerships, branches of foreign entities) must register for CIT with the TRC. Registration is required before starting business operations. Non-resident companies with a permanent establishment in Tonga are also subject to CIT on Tongan-source income.
What is the filing deadline for corporate tax?
Annual CIT returns must be filed by March 31 of the following year. Tax is paid in quarterly installments during the year based on the previous year's liability, with a final settlement upon filing. Late filing penalties apply.
Are there any regional taxes in Tonga?
No. Tonga has a unitary tax system with no regional or municipal corporate taxes. The 25% CIT is the only corporate-level tax. There is no trade tax, business tax, or local surcharge on corporate profits.