US Estate Tax Exposure for Property Portfolio Owners: What to Do Now US estate tax property portfolio owners can face a 40% federal levy on the worldwide value of their estate if they are US citizens or domiciliaries, or on their US-situated property if they are not. With tax due roughly nine months after death, […]
US estate tax property portfolio owners can face a 40% federal levy on the worldwide value of their estate if they are US citizens or domiciliaries, or on their US-situated property if they are not. With tax due roughly nine months after death, illiquid portfolios risk a forced sale unless you plan.
By the Jungle Tax Cross-Border Tax Team — reviewed by a US-UK dual-qualified adviser (CPA / Enrolled Agent).
Two questions decide your exposure: are you a US citizen or US-domiciled, and where is the property located? The answer determines whether the US taxes your entire worldwide estate or only your American assets.
If you are a US citizen or a US domiciliary (someone who has made the United States their permanent home), the US estate tax reaches your worldwide estate — every rental flat in Manchester, every buy-to-let in Leeds, every commercial unit in Miami. If you are neither, the US taxes only your US-situs assets, which for portfolio owners means American real estate held directly.
Domicile for US estate tax is a facts-and-circumstances test based on intent to remain indefinitely, and it is separate from the residence and domicile rules used for UK tax or US income tax. Many American expats living in Britain remain US citizens and therefore stay fully within the worldwide net regardless of where they live.
For decedents who die after 31 December 2025, the unified exclusion amount is $15 million per person ($30 million for a married couple using portability), made permanent by the One Big Beautiful Bill Act (OBBBA), signed on 4 July 2025. In 2025, the figure was $13.99 million. The top estate tax rate remains 40%.
That headline number reassures many people — until they realize it protects only US citizens and domiciliaries. A non-US-domiciled owner of US real estate receives a US exemption of just $60,000. Above that, the 40% rate bites on the American property alone, though the US-UK treaty can rescue the position (more below).
|
Status |
What does the US tax |
Base exemption (2026) |
Top rate |
|---|---|---|---|
|
US citizen or US domiciliary |
Worldwide estate |
$15,000,000 |
40% |
|
Non-US domiciliary (no treaty relief) |
US-situs assets only |
$60,000 |
40% |
|
UK domiciliary (with US-UK treaty) |
US-situs assets, pro-rata credit |
Pro-rata share of $15,000,000 |
40% |
Property portfolios combine three risks that liquid share portfolios do not: illiquidity, valuation uncertainty, and a hard payment deadline. Together, they can turn a paper tax bill into a fire sale.
US federal estate tax is generally due, and Form 706 (or Form 706-NA for non-domiciliaries) filed, within nine months of the date of death. A portfolio of buildings cannot be sold in nine months at fair value. Executors facing a 40% bill on illiquid bricks and mortar are frequently forced to sell into a weak market, accept a discount, or take on debt — destroying value the deceased spent a lifetime building.
Every property must be valued at its fair market value on the date of death, and the IRS can challenge optimistic figures. Portfolios spanning residential, commercial, and mixed-use assets in different markets demand credible, defensible appraisals. Get this wrong, and you invite penalties and interest on top of the tax.
US-situs real estate — physically located in the United States — is always within the US estate tax net, even for a non-domiciliary. Property outside the US is foreign-situs and escapes US estate tax unless you are a US citizen or domiciliary, in which case it is taxed anyway as part of your worldwide estate. Holding US property through certain structures can change its situs characterization, which is why structure matters.
The US-UK Estate and Gift Tax Treaty is the single most important document for US estate tax property portfolio owners with cross-border assets. It prevents both countries from taxing the same asset without relief, and it can dramatically improve a non-domiciliary’s position.
For a UK domiciliary who owns US real estate, the treaty replaces the miserly $60,000 exemption with a pro-rata share of the full US exclusion. The credit is broadly the $15 million exclusion multiplied by the ratio of US-situs assets to the worldwide estate. A UK-domiciled investor with $2 million of US property inside a $20 million worldwide estate can shelter roughly a tenth of $15 million — far more than $60,000 — and often eliminate the US bill. Form 706-NA must still be filed within nine months to claim the treaty position where US assets exceed $60,000.
UK Inheritance Tax (IHT) applies at 40% on the value of an estate above the £325,000 nil-rate band, with a further £175,000 residence nil-rate band available where a qualifying home passes to direct descendants (both frozen until April 2031). A US citizen who is also UK-domiciled or deemed domiciled can face IHT on worldwide assets and US estate tax on the same portfolio at the same time. The treaty coordinates the two systems and grants credits so that the same asset is not taxed twice in full, but the mechanics are technical, and the credits do not always cover the full overlap.
The goal is twofold: shrink the taxable estate and create liquidity so heirs are never forced to sell. Several established tools do both.
The 2026 annual gift tax exclusion is $19,000 per recipient ($38,000 for a married couple splitting gifts), which passes free of gift tax and outside your estate. Larger gifts draw on the unified $15 million exemption. Gifting fractional interests in property, or interests in an entity that holds property, can move future growth out of your estate — though US and UK gift rules differ sharply and must be coordinated.
An Irrevocable Life Insurance Trust (ILIT) holds a life policy outside your taxable estate and delivers tax-free cash to your executors exactly when the nine-month bill falls due. For property portfolio owners, this is often the cleanest way to avoid a fire sale: the trust pays the estate tax, and the buildings stay in the family.
The unlimited marital deduction that defers estate tax on assets left to a spouse does not apply where the surviving spouse is not a US citizen. A Qualified Domestic Trust (QDOT) restores that deferral, holding the assets for the non-citizen spouse and postponing US estate tax until the trust makes principal distributions or the spouse dies. For mixed-nationality couples — common among American expats in the UK — a QDOT is frequently essential.
Holding property through partnerships or limited companies can, in the right circumstances, support valuation discounts for lack of marketability and lack of control, reducing the value counted in the estate. Structures also affect situs and creditor protection. They must be built correctly — a poorly designed structure can create US income tax problems or fail to achieve the intended estate result.
US assets that pass through the estate generally receive a step-up in cost basis to the date-of-death value, thereby wiping out unrealized capital gains for US income tax purposes. Aggressive lifetime gifting to cut estate tax can forfeit this step-up, so the estate tax saving must be weighed against the income tax cost.
A client we will call Margaret is a US citizen who has lived in London for twenty years. She owns six UK rental properties worth £4.2 million, two apartments in New York worth $2.6 million, and a modest share portfolio. As a US citizen she is exposed to US estate tax on her entire worldwide estate; as a long-term UK resident she is within the UK IHT net too.
On paper her worldwide estate sat comfortably under the $15 million US exemption, so her US estate tax looked negligible. The real danger was UK IHT on the £4.2 million of British property, and liquidity: her heirs would owe UK IHT within six months and had almost no cash to pay it. We arranged an ILIT-held life policy sized to the projected IHT liability, restructured two of the UK holdings to use both her and her late husband’s nil-rate and residence nil-rate bands, and confirmed the treaty credits so the New York apartments were not taxed twice. Her heirs will now inherit the portfolio intact, with insurance proceeds covering the tax — no forced sale.
If you own property on both sides of the Atlantic, do not wait until an executor is staring at a nine-month deadline. Jungle Tax builds coordinated US and UK estate plans for American expats and cross-border families — protecting your portfolio and your heirs.
Email hello@jungletax.co.uk | Call 0333 880 7974 | Visit jungletax.co.uk
Explore related guides: US-UK estate tax treaty explained, the US expat tax guide for the UK, UK inheritance tax for Americans, filing Form 706-NA, QDOTs for a non-citizen spouse, and cross-border lifetime gifting.
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If you are a US citizen or US domiciliary, yes — the US estate tax applies to your worldwide estate, including UK rental and commercial property. If you are not a US person, US estate tax applies only to your US-situs assets. UK property is separately exposed to UK Inheritance Tax at 40% above the available nil-rate bands.
The unified exclusion is $15 million per person, or $30 million for a married couple using portability, made permanent under OBBA for deaths after 31 December 2025. The top estate tax rate is 40%. Non-US domiciliaries without treaty relief get only a $60,000 exemption on US assets.
It prevents double taxation and allows a UK domiciliary to claim a pro rata share of the full US exclusion amount instead of the $60,000 default — often eliminating US estate tax on US property. It also provides credits so that neither country fully taxes the same asset. Form 706-NA is still required where US assets exceed $60,000.
Federal estate tax is generally payable, and Form 706 or Form 706-NA is filed, within nine months of the date of death. For illiquid property portfolios, this deadline is the central planning problem because buildings cannot be sold quickly at fair value.
Yes. An Irrevocable Life Insurance Trust (ILIT) holds the policy outside your taxable estate and pays tax-free proceeds to your executors, giving them the cash to settle the estate tax within nine months without selling property.
A Qualified Domestic Trust preserves the marital deduction where the surviving spouse is not a US citizen, deferring US estate tax until distributions or the spouse’s death. Mixed-nationality couples with US assets frequently need one, as the ordinary spousal deferral does not otherwise apply.
