The UK-Argentina Double Tax Treaty: Coverage, Rates and Claims

The United Kingdom and Argentina signed their double-taxation convention in 1996. It entered into force on 1 August 1997 and became effective in Argentina from 1 January 1998. In the UK, it became effective from 1 April 1998 for corporation tax and 6 April 1998 for income tax and capital gains tax. The convention has since been modified by the Multilateral Instrument, or MLI.

The treaty allocates taxing rights, limits certain source-country taxes and provides credit mechanisms where both countries may tax the same income. Eligibility still depends on domestic residence rules, treaty residence, beneficial ownership and the detailed article covering the income. The GOV.UK treaty page provides the convention and the combined reading materials.

When the MLI Changes Apply

The MLI modifications apply in the UK from:

• 1 January 2026 for taxes withheld at source
• 1 April 2027 for corporation tax
• 6 April 2027 for income tax and capital gains tax

In Argentina, they apply from:

• 1 January 2026 for taxes withheld at source
• 1 January 2027 for other taxes

The modifications include the principal-purpose test and revised mutual agreement procedure rules. The synthesised text is a convenient reading aid recording the two governments' shared understanding of how the MLI modifies the convention. Its disclaimer confirms that the authentic convention and MLI texts remain the applicable legal texts and take precedence where legal status matters.

Establishing Treaty Residence

Each country first applies its domestic residence law. For the UK, individuals commonly start with the Statutory Residence Test. People preparing to leave should also review the P85 guide. Argentina applies its own domestic residence provisions.

When both countries treat an individual as resident under their respective domestic laws, Article 4 applies its tie-breaker in sequence. It considers:

1. Where the individual has a permanent home available
2. Where the individual's centre of vital interests lies
3. Where the individual has a habitual abode
4. The individual's nationality
5. Competent-authority agreement if the individual is a national of both states or neither

Prior agreement between the countries is not required before applying the first three tests. Evidence such as housing arrangements, family location, work, economic connections and time spent in each country can therefore be decisive.

Withholding Ceilings

For an eligible treaty resident who is the beneficial owner, the main ceilings are:

These figures are ceilings under the treaty. Domestic law can produce a lower charge, and the claimant must satisfy the relevant conditions. HMRC's Argentina treaty summary is useful for checking rates, although its tables describing income as taxable only in the UK are expressly framed around income beneficially owned by UK residents.

The 10% dividend ceiling is particularly easy to misread. Article 10 reserves it for a beneficial owner that is itself a company and that controls the required voting power directly or indirectly. An individual does not qualify for 10% merely by holding 25% or more of the voting rights.

Claiming Relief on Argentine-Source Income

A UK treaty resident seeking a reduced Argentine withholding rate will normally need proof of UK residence. HMRC explains that the overseas authority handling a claim will usually ask it to certify UK residence. The claimant can request an HMRC Certificate of Residence, then follow the payer's and Argentine authority's documentary process.

An ARCA fiscal residence certificate serves the opposite direction. ARCA issues it to people resident in Argentina so they can establish Argentine residence when seeking treaty treatment in the UK or another country. It does not establish the UK residence required for a UK resident's claim against Argentine tax.

Treaty entitlement and claim procedure are separate questions. A certificate supports residence, while the payer or tax authority may also require forms, beneficial-ownership evidence and information about the payment.

Foreign Tax Credit Relief

Where a UK resident reports Argentine income, Article 23 allows qualifying Argentine tax to be credited subject to UK law. Two restrictions matter. First, the eligible Argentine tax is limited to tax permitted by the treaty. Second, HMRC caps the UK credit at the lower of the eligible foreign tax and the UK tax attributable to the same doubly taxed income. The treaty withholding percentage is therefore only one limit in the calculation.

A claim is commonly made through Self Assessment, with records of gross income, Argentine tax deducted, exchange-rate calculations and supporting certificates retained. A payment exceeding the treaty ceiling may require a repayment claim in Argentina because the UK credit calculation does not automatically absorb an excessive foreign charge.

Argentina applies its corresponding Article 23 credit method when an Argentine resident has income that the UK is also allowed to tax. Domestic rules govern the calculation and evidence required in each country.

Occupational, Private and Government-Service Pensions

Article 18 covers pensions and similar remuneration paid in consideration of past employment, together with annuities paid to a resident of a contracting state. Qualifying occupational, private and government-service pensions and annuities are taxable only in the recipient's treaty residence state. A qualifying UK pension paid to an Argentine treaty resident is therefore allocated to Argentina. The same article allocates a qualifying Argentine pension paid to a UK treaty resident to the UK.

The payment's label does not settle eligibility. The connection with past employment, the annuity definition and the recipient's treaty residence all require checking. Retirees can use the UK pension guide for related transfer, payment and uprating issues.

The UK State Pension

The UK State Pension requires separate treatment. HMRC's pensions guidance says that treaty wording limited to payments “in consideration of past employment” does not provide relief for a UK State Pension. Because Article 18 uses that wording, the State Pension falls outside that article.

For an Argentine treaty resident, Article 21 permits Argentina to tax as the residence state and Article 21(5) also permits the UK to tax UK-source income not dealt with in earlier articles. Argentina's Article 23 credit method addresses qualifying double taxation, subject to its domestic credit rules.

State Pension uprating is a separate social-security matter. Argentina is absent from the DWP's exhaustive list of countries where annual increases are paid, so a UK State Pension paid there is generally frozen at the applicable rate.

Social Security Contributions

The tax convention does not allocate National Insurance or ANSES contributions. Liability follows the relevant domestic social-security rules and the person's working arrangements. Someone employed in Argentina will commonly enter the Argentine system, while UK National Insurance questions can depend on employer, assignment and contribution history. The National Insurance contributions guide covers the UK side.

Anti-Abuse Rule

The MLI adds a principal-purpose test. A treaty benefit can be denied where it is reasonable to conclude, having regard to all relevant facts and circumstances, that obtaining the benefit was one of the principal purposes of an arrangement or transaction, unless granting it would accord with the object and purpose of the relevant treaty provisions.

This deserves attention where dividends, interest or royalties pass through an intermediary, where an entity has limited commercial substance, or where steps were timed primarily around a treaty benefit. Residence documents alone do not establish entitlement under every article.

MAP and Treaty Disputes

If taxation appears inconsistent with the convention, the revised mutual agreement procedure allows the affected person to present the case to the competent authority of either contracting state. The deadline is three years from the first notification of the action giving rise to the disputed taxation.

Domestic objections and MAP can coexist. The person does not have to wait for domestic remedies to fail before submitting a MAP request. For the UK, the contact is HMRC's competent authority. Argentina's current OECD dispute-resolution profile lists the Secretaría de Hacienda, Ministerio de Economía as the authority to which a MAP request should be made.

Not tax advice. Treaty classification and relief depend on the facts, dates and domestic filings in both countries. Obtain coordinated UK and Argentine advice for the specific income or gain.

MAP is a government-to-government process concerning treaty application. It does not replace protective domestic filing deadlines, payment obligations or ordinary appeals. Anyone facing a material assessment should check both procedural tracks promptly and obtain advice based on the authentic treaty texts and the relevant domestic law.