HMRC, Tax Residency, and the Statutory Residence Test for Brits in Argentina

The most expensive mistake British expats make when moving to Argentina is getting their tax residency wrong. Not because anyone is trying to evade tax, but because the rules are genuinely complex, the penalties for getting it wrong are real, and most people only discover the problem two years later when HMRC sends a letter.

This guide is not a substitute for an accountant. It is a map of the territory so you know what questions to ask.

The Statutory Residence Test (SRT)

The SRT is the set of rules that determines whether you are UK tax resident for a given tax year. It is not optional and it is not a matter of opinion. You either meet the tests or you do not.

The SRT has three parts, applied in order:

1. The Automatic Overseas Tests: If you meet any of these, you are NOT UK tax resident. The most relevant for Argentina-bound Brits:

• You work full-time overseas (35+ hours/week on average) and spend fewer than 91 days in the UK in the tax year.
• You spend fewer than 16 days in the UK in the tax year.

2. The Automatic UK Tests: If you meet any of these, you ARE UK tax resident regardless of the overseas tests:

• You spend 183+ days in the UK in the tax year.
• You have a home in the UK and no home overseas, and you spend at least 30 days at your UK home.
• You work full-time in the UK.

3. The Sufficient Ties Test: If you pass neither the automatic overseas nor automatic UK tests, you count your "ties" to the UK (family, accommodation, work, 90-day presence, country tie). The more ties you have, the fewer days you can spend in the UK before becoming tax resident.

What to Do Before You Leave the UK

Form P85: Tell HMRC you are leaving using form P85 (available on GOV.UK). This triggers HMRC to review your residency status and can result in a tax refund if you have overpaid in the year of departure.

Split-year treatment: In the tax year you leave the UK, you may qualify for split-year treatment. This means you are treated as UK tax resident for the part of the year before you leave and non-resident for the part after. It affects when you stop paying UK tax on foreign income.

Notify your UK bank: Tell your UK bank you are moving abroad. Some banks close accounts for non-residents; others allow them with restrictions.

Retain evidence: Keep flight tickets, rental contracts, utility bills, and employment contracts. If HMRC ever questions your residency, you will need to prove when you left and what ties you cut.

The UK-Argentina Double Taxation Treaty

The UK and Argentina have a double taxation treaty (DTA) that prevents you paying tax twice on the same income. Key points:

• Employment income: Generally taxed where the work is performed. If you work remotely for a UK company from Argentina, the DTA provisions are complex — get advice.
• Pension income: The DTA generally gives taxing rights to the country of residence, but the UK retains rights to tax UK government pensions.
• Rental income: Taxed in the country where the property is located (the UK, for UK property).
• Capital gains: Taxed in the country of residence for most assets, but UK property gains are taxed in the UK regardless of residence.

The DTA does not mean you pay no tax. It means you do not pay twice. You may still have tax obligations in both countries.

Argentine Tax Residency

You become Argentine tax resident if:

• You spend 183+ days in Argentina in a calendar year, OR
• You have your "centre of vital interests" in Argentina (family, home, economic activity).

Argentine tax residents are taxed on worldwide income. The top rate is 35%. There is a wealth tax on global assets for high-net-worth individuals.

If you are tax resident in both countries, the DTA has tie-breaker rules to determine which country has primary taxing rights. This is not DIY territory.

Common Mistakes

Mistake 1: "I have left the UK so I don't need to file a UK tax return." If you have UK income (rent, dividends, pension), you may still need to file.

Mistake 2: "I spend less than 90 days in the UK so I'm not resident." The SRT is more nuanced than this. Days, ties, and work patterns all matter.

Mistake 3: "The DTA means I only pay tax in one country." No — it prevents double taxation, not all taxation.

Mistake 4: "I'll sort it out next year." Tax residency is assessed by tax year. Getting it wrong in year one can create problems for years two, three, and four.

When to Get Professional Help

If any of the following apply, you need an accountant who understands both UK and Argentine tax:

• You have income in both countries
• You own UK property
• You have a UK pension
• You are self-employed or a company director
• You are considering split-year residency
• Your stay in Argentina may be temporary

Worth reading next

• UK State Pension in Argentina: The Frozen Pension Trap
• Retire to Argentina from the UK: A Realistic Guide
• Sending Money from the UK to Argentina