Independent Pacific island kingdom and Commonwealth realm.
Tonga taxes resident individuals and companies on worldwide income (income from all sources within and outside Tonga), while non-residents are taxed only on Tongan-source income, under the Income Tax Act (Cap. 26.08) administered by Tonga's Ministry of Revenue and Customs.
The tax year and specific corporate filing deadlines are not confirmed in available primary sources beyond the general residency-year framework set out in Section 4 of the Income Tax Act; confirm current filing deadlines directly with Tonga's Ministry of Revenue and Customs before relying on this page.
25% (per Bloomberg Tax, cited via Tax Foundation's sourced compilation).
Tonga does impose income tax on individuals via progressive PAYE withholding. Part 4, Division 1 of the primary Income Tax Act confirms individuals are taxed; specific bracket rates are set by Cabinet Order under section 5(1) rather than fixed in the Act text itself. This corrects a claim from a secondary source (TaxAtlas) that incorrectly states Tonga has no personal income tax at all, which is contradicted both by the primary Act and by the specific bracket data found in other available sources.
15% standard Consumption Tax (CT). The CT functions similarly to a VAT, applying to goods and services supplied within Tonga and to imports; exports are zero-rated and certain essential food items may be exempt or zero-rated.
Per Section 4 of the Income Tax Act (Cap. 26.08), an individual is a resident for a fiscal year if any of three tests is met: (a) has a home in Tonga at any time during the year, (b) is present in Tonga for 183 days or more (aggregate) in any 12-month period commencing or ending during the year, or (c) is a Government employee posted abroad. Meeting any one test makes the individual resident for the whole year, subject to part-year residence rules for the year residency starts or ends. A company is resident if incorporated in Tonga, has its centre of administrative management in Tonga at any time during the year, or is a partnership with a resident partner. A trust is resident if settled in Tonga or has a resident trustee at any time during the year. Residents are taxed on worldwide income (income from all sources within and outside Tonga); non-residents only on Tongan-source income.
A non-resident company operating through a permanent establishment in Tonga is subject to Tongan corporate tax on the profits attributable to that establishment; the same thin capitalization rule described elsewhere on this page (2:1 debt-to-equity limit) applies to a non-resident company's Tongan permanent establishment, with debt and equity computed by reference to amounts attributable to the PE specifically, treating the PE consistently with a foreign-controlled resident company for this purpose.
No Controlled Foreign Company provisions were found in the Income Tax Act's structure (confirmed by reviewing the Act's full table of contents and anti-avoidance provisions, Part 7 - Sections 66-67 cover transactions between associates and general tax avoidance schemes, but neither constitutes a CFC attribution regime).
If a foreign-controlled resident company (other than a financial institution) has a debt-to-equity ratio exceeding 2:1 at any time during a fiscal year, the interest deduction is disallowed on the portion of debt exceeding that ratio, for the period the ratio was exceeded. An exception applies if the company's debt does not exceed the "arm's length debt amount" (what an unrelated financial institution would lend given the company's circumstances) at all times during the year. "Foreign-controlled resident company" means a resident company where 50% or more of beneficial ownership is controlled by a non-resident person, alone or with an associate. The same rule applies to a non-resident company's Tongan permanent establishment, with debt and equity computed by reference to amounts attributable to the PE.
Tonga classifies entities under its own domestic Income Tax Act rather than offering an elective check-the-box system, and no ATAD2-style anti-hybrid mismatch regime addressing double-deduction or deduction-without-inclusion outcomes has been identified, consistent with Tonga having no CFC regime; Part 7 of the Act (Sections 66-67, covering transactions between associates and general tax avoidance schemes) functions as Tonga's principal anti-avoidance backstop instead.
No domestic FBAR-equivalent regime requires Tongan residents to separately disclose foreign financial accounts, and Tonga is not currently a CRS participating jurisdiction, so it does not automatically exchange financial account information with foreign tax authorities under the OECD's Common Reporting Standard. US persons remain independently subject to FinCEN Form 114 (FBAR) and potentially Form 8938 regardless of Tonga's own rules.
No dedicated participation exemption regime for dividends or capital gains from a qualifying subsidiary was identified in the Income Tax Act; confirm current treatment of intercompany dividends and share disposals directly with Tonga's Ministry of Revenue and Customs before relying on this page.
Section 62 of the Income Tax Act provides a unilateral foreign tax credit mechanism for tax paid abroad on income also taxed in Tonga, operating independently of any bilateral treaty; since Tonga has no double taxation agreements in force, this domestic unilateral credit is the primary relief mechanism available to Tongan taxpayers with foreign-source income, rather than treaty-based relief.
Tonga has no double taxation agreements, consistent with its small economy and reliance on development assistance rather than treaty relief. The Income Tax Act's Section 62 foreign tax credit mechanism provides unilateral double-tax relief independently of any treaty, so the absence of DTAs does not leave Tongan taxpayers without any double-tax relief option - it is simply provided domestically rather than via treaty.