UK Inheritance Tax When Living in Argentina: Domicile, Estate Planning and the £325K Threshold

UK Inheritance Tax (IHT) follows you based on domicile, not residence. This is a crucial distinction that catches many British expats. You can be non-UK-resident for income tax purposes (under the SRT) but still UK-domiciled for IHT, meaning HMRC can tax your entire worldwide estate at death, including your Argentine property, bank accounts, and investments.

Domicile vs residence

For related context, see UK Tax and HMRC for British Expats in Argentina.

Residence (for income tax) is where you live day to day, determined by the SRT and the number of days you spend in each country.

Domicile (for IHT) is the country you consider your permanent home. the place you intend to return to ultimately. Domicile is much harder to change than residence because it involves demonstrating a permanent shift in life intent, not just a change of address.

Every British citizen acquires a domicile of origin (usually England, Scotland, Wales, or Northern Ireland) at birth. Moving to Argentina does not automatically change your domicile. To acquire an Argentine domicile of choice, you would need to demonstrate:

• You intend to live in Argentina permanently (not temporarily)
• You have severed ties to the UK that suggest return intent (sold UK property, closed UK social circles, cancelled UK memberships)
• You have actively established life in Argentina (citizenship, property ownership, family integration, testamentary documents under Argentine law)

HMRC scrutinises domicile changes aggressively because the tax consequences are large.

The IHT exposure

If you die UK-domiciled, HMRC taxes your worldwide estate. including:

• UK property
• UK bank accounts and investments
• Argentine property, bank accounts, and investments
• Life insurance proceeds
• Pension death benefits (some exemptions apply)
• Personal possessions worldwide

The rate is 40% on everything above the nil-rate band.

The nil-rate band

The nil-rate band is £325,000 per person. Additionally, the residence nil-rate band of £175,000 applies if your estate includes a qualifying home passed to direct descendants.

Combined: up to £500,000 per person, or £1,000,000 for a married couple, can pass IHT-free. Everything above that is taxed at 40%.

For British expats with significant Argentine and UK assets, this threshold can be exceeded quickly once Argentine property, UK pensions, ISAs, and other investments are combined.

The deemed domicile rule

Even if you successfully acquire an Argentine domicile of choice, the deemed domicile rule means:

• If you were UK-resident for 15 of the past 20 tax years, you are treated as UK-domiciled for IHT regardless of your actual domicile.
• This 15-year clock runs from the last year of UK residence.

Example: you lived in the UK from birth to age 55 (at least 15 UK-resident years), then moved to Argentina permanently at 55. Even if you acquire Argentine domicile of choice immediately, you are deemed UK-domiciled for IHT purposes for the first 5 years after leaving (until you have been non-UK-resident for 6+ of the past 20 years). During those 5 years, your worldwide estate remains fully exposed to UK IHT.

Argentine estate tax

Argentina does not currently have a federal inheritance tax (it was abolished in 1976). Some provinces have reinstituted provincial inheritance taxes at modest rates (1-4%), but Buenos Aires province does not.

This means:

• If you die as an Argentine-domiciled (and non-UK-domiciled) person, Argentine succession rules apply with minimal or zero estate tax.
• If you die as UK-domiciled, both UK IHT and (potentially) Argentine provincial taxes apply — though the DTA may provide credits.

The practical goal for many British expats is to transition from UK domicile to Argentine domicile, thereby moving from a 40% worldwide estate tax to a near-zero regime.

Estate planning strategies

1. Make a will in both countries. A UK will covering UK assets and an Argentine will covering Argentine assets avoids probate conflicts. Both wills should reference each other and not inadvertently revoke each other.

2. Use the spousal exemption. Assets passing between UK-domiciled spouses are IHT-exempt. If one spouse is UK-domiciled and the other acquires Argentine domicile, the dynamics change. consult a specialist.

3. Consider lifetime gifts. UK IHT allows gifts that become exempt after 7 years (potentially exempt transfers). Gifting assets while alive and surviving 7 years removes them from the estate.

4. Use pensions strategically. UK pensions generally sit outside the IHT estate. Keeping wealth in SIPP or company pension rather than in property or bank accounts can reduce IHT exposure.

5. Life insurance. A life insurance policy written in trust can provide funds to pay the IHT bill without the estate needing to sell assets. Consult a UK IFA with international experience.

6. Consider trusts. UK trusts for non-domiciled settlors have complex rules but can shelter assets from IHT in some circumstances.

When to get professional help

IHT planning is not DIY territory for cross-border estates. You need:

• A UK solicitor specialising in international estate planning
• An Argentine escribano or lawyer for the Argentine will
• A UK chartered accountant or IFA with IHT experience
• Potentially a domicile specialist if you are arguing a change of domicile

The cost of professional advice (£2,000-10,000 for a comprehensive estate plan) is trivial compared to a 40% IHT bill on a £500,000+ worldwide estate.

Not tax or legal advice. IHT law is complex and HMRC actively challenges domicile claims. This guide is orientation only. Take professional advice before making estate planning decisions.

Worth reading next

• UK Tax and HMRC for British Expats in Argentina
• Retiring to Argentina on a UK Pension: What You Need to Know
• UK SIPP Pension While Living in Argentina: Drawdown, Tax and Access