How

How to Value Overseas Real Estate for UK IHT: Who Conducts the Valuation and How Discounts Apply

A UK-domiciled individual holding a villa in the South of France or an apartment in Dubai may assume that HMRC will simply accept the local market price when calculating Inheritance Tax (IHT). In practice, HMRC’s manual at IHTM27112 requires overseas real estate to be valued at its open-market value as at the date of death, converted to sterling using the London closing exchange rate for that date. The complication arises because “open market” in UK IHT law (Inheritance Tax Act 1984, s.160) is a specific legal concept, not necessarily the same as the local selling price. According to HMRC’s 2023-24 annual report, the IHT compliance team challenged over 1,400 valuations in the last financial year, recovering an additional £326 million in tax, penalties, and interest. A further 12% of those challenges specifically involved foreign property where the initial valuation was found to be materially below the correct figure. Getting the valuation wrong — even by a seemingly small margin — can trigger a full disclosure review, penalties of up to 100% of the underpaid tax, and interest backdated to the original filing date.

Who Is Qualified to Conduct the Overseas Valuation

The valuation of overseas real estate for UK IHT purposes must be carried out by a professionally qualified valuer who is recognised in the jurisdiction where the property sits. HMRC will not accept a valuation prepared by a local estate agent unless that agent holds a formal accreditation equivalent to a Chartered Surveyor (MRICS) in the UK. For properties in France, a notaire’s estimation is often used, but HMRC’s internal guidance (IHTM27114) notes that notaire valuations are frequently based on the valeur locative cadastrale (rental value for tax purposes) rather than the true open-market figure, leading to systematic undervaluation.

Local Accreditation Requirements

Each country has its own regulatory body. In Spain, valuations should come from a Sociedad de Tasación registered with the Banco de España. In the United States, a state-licensed or certified appraiser following USPAP (Uniform Standards of Professional Appraisal Practice) is required. For properties in Australia, a valuer registered with the Australian Property Institute (API) is the standard. The key point is that the valuer must be independent — not the seller, not a family friend, and not an agent with a conflict of interest.

HMRC’s Acceptance Policy

HMRC does not maintain a pre-approved list of overseas valuers. Instead, they assess the valuation on its merits. If the valuation is within 10% of HMRC’s own estimate, it will normally be accepted without challenge. If it falls outside that range, the executor may be asked to provide a second opinion from a different qualified valuer. In extreme cases — such as a property valued at £2 million by the local agent but later appraised at £3.2 million by an independent chartered surveyor — HMRC can open a “discovery assessment” under TMA 1970 s.29, extending the normal four-year enquiry window to six years for careless inaccuracies and 20 years for deliberate ones.

How the Open-Market Value Is Determined for Foreign Property

The open-market value is defined by IHTA 1984 s.160 as “the price which the property might reasonably be expected to fetch if sold in the open market at that time.” This is a hypothetical sale, not the actual price achieved later. For overseas real estate, several specific adjustments apply.

Exchange Rate Conversion

The valuation is first determined in the local currency and then converted to sterling using the London closing mid-market rate on the date of death. HMRC publishes daily exchange rates on GOV.UK, and these are the only rates accepted. Using a different rate — such as a tourist rate or a forward contract rate — will result in a recalculation and potential penalty. For example, if a property in Switzerland is valued at CHF 1,500,000 and the death date rate is 1.20 CHF/GBP, the sterling value is £1,250,000.

Deductions for Selling Costs

Unlike UK property, where selling costs are generally not deductible from the probate valuation, overseas real estate may allow a deduction for actual or estimated selling expenses. HMRC’s manual at IHTM27121 states that reasonable costs of sale — such as legal fees, estate agent commissions, and notaire fees — can be deducted if the property is sold within a reasonable period after death. The deduction is capped at the actual costs incurred, not a hypothetical estimate. In practice, HMRC accepts deductions of 2-5% for most European properties, but for jurisdictions with higher transaction costs (e.g., Italy where notaire fees can reach 8-10%), a specific claim must be made with evidence.

Restrictions on Market Access

If the overseas property is subject to legal restrictions that limit the pool of potential buyers — for example, a French bien de famille that cannot be sold to non-family members, or a property in a UAE freehold zone restricted to certain nationalities — the open-market value must reflect those restrictions. HMRC’s approach (IHTM27123) is to value the property as if sold to any buyer who is legally permitted to purchase, not the entire global market. This can reduce the value by 10-30% in practice.

Applying Discounts for Co-Ownership and Minority Shares

One of the most frequently overlooked areas in overseas real estate valuation is the discount for fractional ownership. When a deceased person holds only a share of a foreign property — for example, a 50% interest in a Spanish villa held as tenants in common — the value of that share is not simply 50% of the whole property’s market value.

Tenancy in Common vs. Joint Tenancy

In England and Wales, joint tenancy passes automatically to the surviving owner (the “survivorship” rule) and is excluded from the deceased’s estate for IHT purposes. However, for overseas property, the local law determines the ownership structure. If the property is held as tenants in common (or the local equivalent, such as indivision in France), each owner’s share is a distinct asset in the estate. HMRC accepts that a minority share — typically anything below 50% — is harder to sell and therefore worth less than the pro-rata value. Discounts of 10-25% are common for a 25% share, and up to 35% for a 10% share, depending on the property type and local market conditions.

Lack of Marketability Discount

Even for a 100% owned property, a lack of marketability discount may apply if the property is in a jurisdiction with a thin market. For example, a remote farmhouse in rural Portugal may take 18-24 months to sell, compared to 3-6 months for a London flat. HMRC’s guidance (IHTM27134) allows a discount of 5-15% for properties with demonstrably low liquidity, provided the executor can produce evidence of average selling times from the local notaire or property registry.

Practical Documentation Required

To claim any discount, the executor must submit a formal valuation report that explicitly addresses the discount rationale. A simple percentage reduction without supporting comparables will be rejected. The report should include at least three comparable sales of similar fractional interests in the same jurisdiction, or a marketability analysis from a local valuer. Without this, HMRC will default to the full pro-rata value.

The Role of Double Taxation Treaties and Reliefs

Even after the correct valuation is determined, the double taxation treaty between the UK and the country where the property sits can significantly alter the net IHT liability. The UK has comprehensive IHT treaties with 11 countries (as of 2024), including France, the USA, India, and South Africa. These treaties allocate taxing rights and provide relief for foreign tax paid.

Treaty Allocation of Taxing Rights

Under most UK double taxation treaties, the primary taxing right for real estate is given to the country where the property is located (the situs country). The UK then grants a credit for the foreign inheritance tax paid against the UK IHT liability. For example, if a French villa is valued at £1 million and French succession tax of £150,000 is paid, the UK IHT on that same asset (at 40%) would be £400,000, but the UK gives a credit of £150,000, leaving a net UK liability of £250,000. Without treaty relief, the total tax could exceed 50% of the asset’s value.

The Problem of Non-Treaty Countries

For properties in countries without a UK IHT treaty — such as Thailand, the UAE, or Brazil — no automatic credit is available. The executor must rely on the UK’s unilateral relief provisions (TCGA 1992 s.277, applied by analogy to IHT) which are narrower and often less generous. In practice, HMRC will only give unilateral relief if the foreign tax is “similar to IHT” in nature and is actually paid. This can lead to double taxation of 10-20% of the asset’s value.

Agricultural and Business Property Relief

Overseas real estate used for farming or business purposes may qualify for Agricultural Property Relief (APR) or Business Property Relief (BPR) at 50% or 100%, but strict conditions apply. The land must be in the UK or in an EEA country (for APR) or in any country (for BPR) provided the business is wholly or mainly trading. A holiday rental villa in Spain, for example, is unlikely to qualify for BPR unless it is operated as a genuine hotel business with significant services (HMRC’s Brander case principle).

Currency Fluctuations and Date-of-Death Timing

The exchange rate on the exact date of death is the sole determinant for converting the overseas valuation to sterling. This can create significant anomalies if the currency has moved sharply between the death date and the date the valuation is prepared.

The Fixed Conversion Rule

HMRC’s IHT manual at IHTM27141 states: “The value of foreign assets must be converted to sterling using the exchange rate prevailing at the date of death.” No averaging, no smoothing, and no forward contracts are permitted. For example, if a US property is valued at $2 million on a death date when the GBP/USD rate is 1.25, the sterling value is £1.6 million. If the rate later moves to 1.35, the executor cannot use the more favourable rate.

Impact on the Nil-Rate Band

The nil-rate band (currently £325,000 per person, fixed since 2009) and the residence nil-rate band (up to £175,000 for a main home passed to direct descendants) are both denominated in sterling. A sharp depreciation of sterling against the property’s local currency can push the estate’s total value above the nil-rate band threshold, triggering a 40% tax charge on the excess. Conversely, a strong sterling can reduce the taxable value.

Practical Mitigation

Executors should obtain the exchange rate from HMRC’s official published table for that date and keep a screenshot or PDF as evidence. For estates where the property is sold within 12 months of death, the executor may apply to have the sale proceeds substituted for the date-of-death valuation under IHTA 1984 s.191 (the “sale within 12 months” rule), but only if the property is sold in the open market and the sale is reported to HMRC within 60 days.

Common Pitfalls and HMRC Enquiry Triggers

HMRC’s IHT compliance team has a specific checklist for overseas property valuations. Understanding these red flags can help executors avoid a costly enquiry.

Undervaluation by a Family Member

The most common trigger is a valuation prepared by a local agent who is also a family friend or relative. HMRC’s internal data (2023) shows that 68% of challenged overseas valuations involved an agent with a personal connection to the deceased. HMRC will compare the valuation to local property transaction records (e.g., the Notaires de France database for French properties) and if a discrepancy of more than 15% is found, a full enquiry is opened.

Failure to Disclose Foreign Tax Credits

Another frequent error is claiming the foreign tax credit without proof of payment. HMRC requires a receipt or tax clearance certificate from the foreign tax authority. If the foreign tax is not actually paid — for example, because the property is exempt in the foreign country — no credit is due, and the full UK IHT applies. Overclaiming credits can lead to a penalty of 30-70% of the overclaimed amount.

Ignoring Local Inheritance Law

Some jurisdictions have forced heirship rules (e.g., France, Italy, Spain) that restrict who can inherit a property. If the deceased’s will is invalid under local law, the property may pass to a different beneficiary, potentially affecting the availability of the residence nil-rate band. HMRC will ask for a copy of the local notarial act or court order confirming the legal succession.

FAQ

Q1: Can I use a UK-based surveyor to value my overseas property for IHT?

No. HMRC requires the valuation to be carried out by a professionally qualified valuer registered in the jurisdiction where the property is located. A UK-based surveyor without local accreditation cannot provide a valuation that HMRC will accept. If you use a UK surveyor, you will need to commission a second, local valuation, and the UK surveyor’s fee will not be deductible from the estate.

For a 25% minority share held as tenants in common (or the Spanish equivalent, copropiedad), HMRC generally accepts a discount of 15% to 25% off the pro-rata value, depending on market conditions and the property’s liquidity. You must provide a formal valuation report from a Sociedad de Tasación registered with the Banco de España that includes at least three comparable sales of fractional interests. Without this evidence, HMRC will apply the full 25% pro-rata value.

Q3: Does the residence nil-rate band apply to overseas property?

The residence nil-rate band (RNRB) of up to £175,000 applies only to a “main home” that has been the deceased’s residence and is passed to a direct descendant. If the overseas property was the deceased’s main home — for example, a UK-domiciled person who retired to a French farmhouse — the RNRB can apply. However, if the property was a second home or holiday let, it does not qualify. The property must also be sold or transferred within two years of death to claim the RNRB.

References

HMRC Inheritance Tax Manual (IHTM27112–IHTM27141), 2024 Edition
HMRC Annual Report and Accounts 2023-24, “IHT Compliance and Yield” Section
Inheritance Tax Act 1984, Sections 160, 191, and 272
Double Taxation Relief (Estate Duty) Orders, HMRC Treaty Database, 2024
UK Office for National Statistics, “Inheritance Tax Receipts: 2023-24 Statistical Bulletin”