US Expat Tax Services GROB Pitfalls for US Citizens |

US Expat Tax Services GROB Pitfalls for US Citizens |

US Expat Tax Services: GROB Pitfalls for US Citizens

US Expat Tax Services on GROB for UK-Resident US Citizens

A US-citizen parent who transfers their London family home to their adult children but continues to live in the property rent-free has made what feels like sensible estate planning — removing a valuable asset from their estate — but has in practice created one of the most common and most expensive IHT mistakes in cross-border estate planning: a gift with reservation of benefit. The UK's gift with reservation rules treat the property as remaining in the donor's estate for IHT purposes as long as the benefit continues, making the attempted gift completely ineffective for UK IHT. Furthermore, the same transaction creates a separate set of US gift tax and estate planning consequences that US expat tax services must address simultaneously — since the US has its own gift tax reporting obligations for transfers of property to family members. The interaction between the UK GROB rules and the US gift tax treatment of the same transaction results in the donor having US gift tax reporting obligations without any corresponding UK IHT effectiveness for the gift.

This article is written for US citizens who are UK residents and who are considering or have already made lifetime gifts of property — including the family home, investment property, or business assets — where they have retained some form of benefit or use. By the end of this guide, you will understand how the UK gift with reservation rules work, how US expat tax services identify and address GROB traps in cross-border estate plans, and the most commonly missed interaction between the UK IHT rules and the US gift tax and estate tax obligations on the same transaction.

What Are US Expat Tax Services in Estate Planning?

US expat tax services in the estate planning context are advisory and compliance services for US citizens living outside the United States who have estate planning needs in both the UK and the US — including lifetime gifts, trust settlements, and property transfers that must be evaluated under both the UK IHT regime and the US federal gift tax and estate tax regime simultaneously. Furthermore, in the GROB context, this requires combining knowledge of the UK gift with reservation of benefit rules under Schedule 20 of the Finance Act 1986 and the pre-owned assets tax regime under Finance Act 2004 — with the US gift tax rules under IRC Chapter 12, the US estate tax rules under IRC Chapter 11, the Form 709 gift tax return requirements, and the US-UK Estate and Gift Tax Treaty credit mechanism. Specifically, the most important practical function of US expat tax services for a UK-resident US-citizen donor is to identify the GROB trap before the lifetime gift is made — not after — since remedying an existing GROB situation by paying full market rent is administratively burdensome, and unwinding a GROB by taking the property back into the estate triggers an IHT charge equivalent to a death charge at that point.

The HMRC guidance on gifts with reservation of benefit is at https://www.gov.uk/hmrc-internal-manuals/inheritance-tax-manual/ihtm14301. The IRS guidance on the US gift tax and Form 709 is at https://www.irs.gov/businesses/small-businesses-self-employed/frequently-asked-questions-on-gift-taxes.

Why GROB Pitfalls Matter More for US Citizens in 2026

The Post-FA 2025 Estate Planning Urgency

The abolition of the UK non-domicile regime from April 2025 has brought all long-term UK residents — including US-citizen UK residents who were previously non-domiciled — into the scope of UK IHT on their worldwide estates. Furthermore, many US-citizen UK residents who were previously relying on their non-domiciled status to keep non-UK assets outside the UK IHT net have now become subject to UK IHT on their worldwide assets, creating an urgent need for estate planning action that reduces the UK IHT exposure on those assets. Consequently, lifetime gifts — including gifts of UK residential property and non-UK investments — have become a primary planning tool for newly long-term-resident US citizens, and the GROB rules are the most significant practical trap for those who attempt to give away property while retaining the use of it. The HMRC guidance on the new long-term residence IHT rules is at https://www.gov.uk/government/publications/changes-to-the-taxation-of-non-uk-domiciled-individuals.

The Pre-Owned Assets Tax as an Alternative Charge

Where a lifetime gift does not technically constitute a gift with reservation of benefit — because the donor has not retained the use or enjoyment of the gifted property directly — but the donor has benefited from the gifted assets in another way, the pre-owned assets tax under Finance Act 2004 may apply as an income tax charge on the annual benefit derived from the formerly owned assets. Furthermore, the POAT applies where the donor disposes of property and then occupies land, uses tangible movable property, or benefits from property funded by assets formerly owned by the donor — thereby creating an income tax charge equivalent to the annual benefit, even where the GROB rules do not apply. Consequently, lifetime estate planning for US-citizen UK residents requires analysis of both the GROB rules and the POAT regime, since the two charges have different conditions but often overlap in complex family arrangements. According to https://www.icaew.com, the pre-owned assets tax applies to arrangements specifically designed to avoid the GROB rules while achieving a similar economic result for the donor.

The US Gift Tax Reporting Obligation on GROB Transactions

For a US citizen UK resident who makes a lifetime gift of property to family members, the US gift tax reporting obligation under Form 709 applies regardless of whether the UK IHT treatment of the same gift is effective or ineffective under the GROB rules. Furthermore, a US-citizen donor who makes a gift of a UK property worth £800,000 to their children — while continuing to live there rent-free — must file Form 709 reporting the gift of approximately $1 million (at current exchange rates) for the year of the transfer, even though the GROB rules mean the property remains in the UK estate for IHT purposes and the UK treats the gift as having not occurred. Consequently, the US gift tax return creates a formal US record of a lifetime transfer that the UK IHT system simultaneously treats as ineffective — a divergence that creates complexity at the date of death, when the UK IHT is assessed on the property as still being in the estate. The US estate tax must also be considered on the same asset.

How the GROB Rules Work and Where US Citizens Get Caught

The Gift With Reservation of Benefit Definition

A gift with reservation of benefit arises under Schedule 20 of the Finance Act 1986 where a person makes a gift and the gifted property is not enjoyed to the entire exclusion of the donor — meaning the donor retains some benefit, use, or enjoyment of the gifted property either at the time of the gift or at any time in the seven years before death. Furthermore, the most commonly encountered GROB situation is the donor who transfers their home to their children but continues to live in the property without paying a full market rent — since living in the property is a direct benefit that prevents the gift from being effective for IHT purposes. Additionally, GROB situations arise when the donor transfers investment assets to a trust of which they are a beneficiary, transfers cash to a company in which they hold shares, or makes gifts of assets from which they retain some economic benefit after the transfer. Consequently, the GROB rules are broader than most donors appreciate, and the test is whether the donor receives any benefit from the gifted property — not merely whether they live in a gifted home.

The IHT Consequences of a GROB

Where a gift is a gift with reservation of benefit, the gifted property remains in the donor's estate for IHT purposes as if no gift had been made — meaning the full value of the property is subject to UK IHT on the donor's death at the prevailing IHT rate. Furthermore, where the benefit ceases before the donor's death — for example, when the donor moves out of the gifted property and stops living there — the property is treated as having left the estate at that point. The seven-year potentially exempt transfer clock starts running from the date the benefit ceases rather than from the date of the original gift. Additionally, where the donor elects to pay the pre-owned assets tax charge in place of the GROB treatment — an election available under the Finance Act 2004 — the property is removed from the estate for IHT purposes. Still, the annual POAT income tax charge applies for every year the benefit continues. Consequently, the GROB election to pay POAT is sometimes advisable where the IHT saving on death substantially exceeds the cumulative POAT charges during the donor's remaining lifetime. The HMRC IHT and GROB guidance is at https://www.gov.uk/hmrc-internal-manuals/inheritance-tax-manual/ihtm14301.

How the US Treats the Same Transaction

For US federal estate and gift tax purposes, the US has its own reserved interest rules under IRC Section 2036 — which provides that a transfer of property in which the transferor retains the possession or enjoyment of the property, or the right to the income from the property, is included in the transferor's gross estate at death. Furthermore, the IRC Section 2036 retained interest rules operate similarly to the UK GROB rules in that a US-citizen donor who transfers their home to their children while continuing to live there rent-free has made a transfer with a retained interest that brings the property back into the US gross estate for estate tax purposes at the value at the date of death. Consequently, a US-citizen UK-resident donor who makes a GROB gift of their UK home has both the UK GROB treatment — keeping the property in the UK IHT estate — and the US IRC Section 2036 treatment — keeping the property in the US gross estate — operating simultaneously. Additionally, the US-UK Estate and Gift Tax Treaty credit mechanism is available to prevent double taxation of the same assets at death. Still, the interaction between the UK GROB rules and the US Section 2036 rules must be specifically analyzed by experienced US expat tax services to confirm that the treaty credit is calculated correctly.

Identifying and Resolving GROB Issues: Practical Steps

Step 1 — Audit existing lifetime gifts for GROB characterization.

Review every lifetime gift of property made by the U.S. citizen donor in the seven years before the planning review — including gifts of the family home, investment properties, personal chattels, cash gifts that were then used to purchase property, and transfers to family trusts — and assess whether the donor has retained any direct or indirect benefit from the gifted assets. Furthermore, the GROB audit must consider not only obvious cases such as living in a gifted home, but also subtler situations such as using gifted artworks displayed in the donor's own home, benefiting from the income of gifted investment assets through a family arrangement, or using gifted cash that funded property now occupied by the donor. Additionally, confirm whether any of the existing gifts trigger the GROB rules or the POAT regime, and calculate the IHT due on the gifted assets if the donor were to die today — as this quantifies the cost of the existing GROB trap. The HMRC GROB guidance is at https://www.gov.uk/hmrc-internal-manuals/inheritance-tax-manual/ihtm14301.

Step 2 — Assess whether the GROB can be remedied without triggering an IHT charge.

Where an existing GROB is identified, assess the options for remedying the situation — specifically, whether the donor can pay a full market rent for the occupied property, starting from the current date, to remove the GROB treatment going forward. Furthermore, paying a full market rent from the date the remedy begins does not trigger an IHT charge on the property. Instead, the seven-year PET clock starts from the date the rent payment begins on a market basis, subject to the donor continuing to pay market rent for the remainder of the gift period. Additionally, confirm the market rent level by reference to independent valuation evidence, as HMRC will challenge a rent below the arm's length market rate for the property, and an inadequate rent does not fully remedy the GROB situation. The IRS guidance on the US treatment of retained interests is at https://www.irs.gov/pub/irs-pdf/p950.pdf.

Step 3 — Model the POAT election versus the GROB treatment.

Where the donor is unwilling to pay market rent and wishes to remain in a gifted property, assess whether electing to pay the pre-owned assets tax — which removes the property from the IHT estate at the cost of an annual income tax charge — produces a better combined UK tax outcome than retaining the GROB treatment. Furthermore, the POAT charge is calculated as the annual benefit of the occupation — broadly, a market rent equivalent — multiplied by the appropriate rate of income tax, and is paid as an annual income tax charge on the self-assessment return for as long as the benefit continues. Additionally, the POAT election is irreversible for the years for which it is made, meaning the donor is committed to the annual income tax charge as the price of the IHT effectiveness of the gift — and the cumulative POAT charges over the donor's remaining lifetime must be modelled against the IHT saving at death to confirm whether the election is worthwhile.

Step 4 — File Form 709 for the original gift and any subsequent adjustments.

File Form 709 reporting the original lifetime gift in the year of the transfer — even where the UK GROB rules render the gift ineffective for IHT — since the US gift tax obligation arises on the date of the transfer regardless of whether the UK IHT system recognizes the gift as effective. Furthermore, report the gift at the US dollar equivalent of the fair market value of the gifted property on the date of the transfer, applying the applicable annual exclusion and using any available lifetime exemption to reduce or eliminate the US gift tax due. Additionally, where the payment of market rent subsequently remedies the GROB, assess whether a supplemental Form 709 is required to report the change in the gift arrangement for US gift tax purposes, and confirm whether the commencement of rent payments changes the US estate tax analysis under IRC Section 2036. The IRS Form 709 instructions are at https://www.irs.gov/forms-pubs/about-form-709.

Step 5 — Model the US-UK estate tax treaty credit at death.

Where the donor's estate will be subject to both UK IHT and US estate tax on the same GROB property at death — because the property is in the estate under both the UK GROB rules and the US Section 2036 retained interest rules — model the treaty credit mechanism to ensure the two charges are correctly offset. Furthermore, the US-UK Estate and Gift Tax Treaty allocates taxing rights by asset situs and provides a proportional credit against each country's tax for assets taxed in both jurisdictions — meaning the UK IHT on the GROB property at death can be credited against the US estate tax on the same property. Additionally, the treaty credit calculation must use consistent asset values and exchange rates in both the UK IHT return and the US Form 706 estate tax return, and the executor must confirm the treaty credit position with a US expat tax service that understands both returns before filing either.

Case Study: US Citizen in Bath, Home Gift and GROB Trap

Our team was engaged by a US citizen who had lived in Bath for twenty years and who had transferred her home — valued at £620,000 at the date of transfer — to her two adult children in equal shares eight years earlier, while continuing to live in the property rent-free. She had believed at the time of the gift that the transfer would remove the property from her IHT estate after seven years. She had also filed a Form 709 for the year of the gift, reporting the transfer of approximately $816,000 (at the exchange rate at the time) and using a portion of her US lifetime exemption.

After reviewing the position, we confirmed that the continued rent-free occupation constituted a gift with reservation of benefit — meaning the property remained in her UK estate for IHT purposes regardless of the seven-year PET clock, since the GROB rules kept the property in the estate for as long as the benefit continued. Furthermore, the property's current value has risen to approximately £920,000, significantly increasing the UK IHT exposure compared with the value at the original gift date. Additionally, we confirmed that the US IRC Section 2036 retained interest rules also kept the property in her US gross estate for estate tax purposes, creating potential US estate tax exposure on the same asset at the inflated current value.

We advised the client on two options. First, she could begin paying a full market rent of approximately £2,400 per month — confirmed by an independent RICS surveyor as the market rent for the property — from which date the GROB treatment would cease and the seven-year PET clock would start running on a gift of the property at its current value of £920,000. Furthermore, the annual market rent would be approximately £28,800, which the children would report as rental income on their UK self-assessment returns — with the income tax on the rent partially offsetting the IHT saving. Second, she could elect to pay the pre-owned assets tax, which we calculated at approximately £6,900 per year (20% income tax rate on an annual benefit equivalent of £34,500, based on the statutory POAT methodology). Additionally, we modeled the US Section 2036 position. We confirmed that commencing market-rent payments would also eliminate the US retained interest, thereby removing the property from the US gross estate once rent payments began at the arm's-length rate. We recommended the POAT election — at £6,900 per year versus £28,800 of actual rent — as the more cost-effective remedy, with the property removed from the IHT estate going forward and the remaining US treaty credit planning addressed separately.

Common GROB Mistakes for UK-Resident US Citizens

Mistake 1 — Gifting the Family Home While Continuing to Occupy Rent-Free

The most common GROB trap is a parent who transfers their home to their children to reduce the IHT estate but continues to live there without paying market rent — a situation that the UK GROB rules treat as if no gift were made for IHT purposes. Furthermore, many donors are advised that the property will leave the estate after seven years — a statement that is correct for a PET but incorrect for a GROB, since the seven-year clock does not run while the GROB treatment applies. The correct approach requires either paying full market rent from the outset of the occupation after the gift or not making the gift of the occupied home as a lifetime transfer. HMRC GROB guidance is at https://www.gov.uk/hmrc-internal-manuals/inheritance-tax-manual/ihtm14301.

Mistake 2 — Filing Form 709 Without Addressing the GROB

A US-citizen donor who files a Form 709 reporting the gift of their home to their children has created a formal US record of a lifetime transfer — but if the UK GROB rules apply, the gift is simultaneously in the UK IHT estate and not available as a US gift for the purposes of the treaty credit at death. Furthermore, the mismatch between the US treatment (a completed gift) and the UK treatment (not a completed gift) creates a complex estate tax position at death where the executor must reconcile the Form 709 gift record with the UK IHT assessment that treats the property as still in the estate. The correct approach is to conduct the GROB analysis before the Form 709 is filed, so that the US gift tax reporting and the UK IHT position are consistent.

Mistake 3 — Not Considering the Pre-Owned Assets Tax

Donors who are advised that their arrangement does not constitute a GROB — because they have technically disposed of the property but continue to benefit from it through a family arrangement — may still be subject to the pre-owned assets tax income charge under Finance Act 2004, which catches arrangements designed to avoid the GROB rules. Furthermore, the POAT regime is broad and catches situations where the donor occupies land previously owned — including land disposed of in exchange for other consideration where the donor effectively retains the benefit. The correct approach requires assessing both the GROB rules and the POAT regime in any lifetime gift arrangement in which the donor retains any continuing connection to the gifted assets.

Mistake 4 — Paying Less Than Full Market Rent

Where a donor attempts to remedy a GROB by paying rent to the donee children for the gifted property, the rent must be at the full market rate to be effective — a rent that is substantially below market rate does not fully remedy the GROB, and HMRC will challenge below-market rents as an insufficient benefit termination. Furthermore, many donors pay a nominal or token rent — for example, covering only the mortgage or a fraction of the market rate — in the mistaken belief that any rent payment ends the GROB treatment. The correct approach requires commissioning an independent professional market rent valuation from an RICS-qualified surveyor before agreeing the rent level with the donee children, and reviewing the rent annually as market conditions change.

Mistake 5 — Not Updating the US Estate Plan After the GROB Is Identified

Where a GROB is identified and remedied, the US estate tax analysis under IRC Section 2036 must also be updated. Since the remedy that ends the GROB treatment (commencement of market rent) also eliminates the US retained interest that kept the property in the US gross estate. Furthermore, where the donee children have reported US income from the rent payments — as they should, since the rent is income to them — the children's US income tax position must be coordinated with the remedy to ensure the rent income is reported correctly in both the US and the UK. The correct approach requires a US expat tax services to review the US Section 2036 position simultaneously with the UK GROB remedy, confirming that the property is removed from both estates on the same date.

Mistake 6 — Not Accounting for GROB Property in the US Form 706

At the donor's death, the executor must include GROB property in the UK IHT estate — but also confirm whether the same property is included in the US gross estate under IRC Section 2036. Furthermore, many executors who are advised by a UK solicitor on the IHT return do not engage a US adviser to confirm the Section 2036 analysis, leaving the US Form 706 either unfiled or incorrectly excluding the GROB property from the gross estate. The correct approach requires the executor to engage a US expat tax services to prepare both the UK IHT return and the US Form 706 simultaneously, with the treaty credit calculated consistently across both returns on the same asset values.

Get in Touch

At US-UK Tax, our team of Chartered Tax Advisers (CTA), Enrolled Agents (EA), and Certified Public Accountants (CPA) — members of the Chartered Institute of Taxation (CIOT) and the American Institute of CPAs (AICPA) — provides comprehensive US expat tax services for UK-resident US citizens making or reviewing lifetime gifts. Furthermore, we audit existing gift arrangements for GROB characterisation under both UK FA 1986 rules and US IRC Section 2036, assess the POAT election where the GROB remedy is appropriate, prepare the Form 709 gift tax return for US-citizen donors, model the treaty credit at death for GROB property included in both estates, and coordinate the UK IHT and US estate tax positions at death through a single integrated engagement. We work alongside UK estate solicitors and independent valuers to ensure the combined UK and US estate planning is consistent and correctly documented.

Contact our team today to begin a confidential review of your lifetime gift arrangements and GROB exposure. Email hello@us-uktax.com, call 0333-8807974, or visit https://www.us-uktax.com/contact/ to book a consultation.

Conclusion

The gift with reservation of benefit trap is one of the most consequential IHT planning failures for UK-resident US citizens, because it renders an intended lifetime gift completely ineffective for UK IHT purposes while still creating a formal US gift tax record through Form 709 — producing a position where the same property is in both the UK IHT estate (as a GROB) and the US gross estate (under IRC Section 2036), and where the treaty credit at death must reconcile the two charges on the same asset. Furthermore, US expat tax services that work across both systems can identify the GROB trap before the gift is made — or remedy an existing GROB through market rent commencement or the POAT election — and ensure that the US Form 709 gift reporting is consistent with the UK IHT treatment of the same transaction. Moreover, the urgency of lifetime estate planning has increased significantly following the FA 2025 abolition of the non-domicile regime, which has brought US-citizen UK residents' worldwide estates into the UK IHT net and made the avoidance of GROB traps a more pressing priority than ever.

The three most important actions for any UK-resident US citizen considering a lifetime gift are: first, assess whether any proposed gift involves a continued benefit for the donor — living in the gifted property, using gifted assets, or benefiting from gifted funds — before the gift is made, since remedying an existing GROB is significantly more complex than avoiding it at the outset; second, pay full market rent immediately where an existing GROB is identified, confirmed by independent professional valuation; and third, ensure that the US Form 709 reporting is filed consistently with the UK IHT treatment of the same gift, with the treaty credit position at death modelled in advance. Contact US-UK Tax at hello@us-uktax.com or call 0333-8807974 to begin a confidential GROB review today.

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FAQs

Q: What is a gift with reservation of benefit for UK IHT purposes?

A GROB arises where a donor makes a lifetime gift but retains some benefit, use, or enjoyment of the gifted property. Under FA 1986 Schedule 20, the property remains in the estate for IHT purposes as if no gift had been made. Living in a gifted home rent-free is the most common example.

Q: Does the US have an equivalent to the UK GROB rules?

Yes. IRC Section 2036 includes transferred property in the US gross estate where the donor retained possession, enjoyment, or the right to income from the property. A US-citizen donor in a GROB situation typically has the property in both the UK IHT estate and the US gross estate simultaneously.

Q: Can paying market rent remedy a gift with reservation of benefit?

Yes, from the date the market rent commences. The rent must be at the full arm's-length market rate, confirmed by an independent professional valuation. Below-market rent does not fully remedy the GROB. The seven-year PET clock runs from the date full market rent begins, not from the original gift date.

Q: What is the pre-owned assets tax and when does it apply?

The POAT is an annual income tax charge under FA 2004 on the benefit derived from property previously owned by the donor. It applies where the GROB rules do not — covering arrangements designed to avoid the GROB while retaining economic benefit. An election to pay POAT removes the property from the IHT estate.

Q: Must a US citizen file Form 709 for a GROB gift?

Yes. The US gift tax reporting obligation arises on the date of the transfer, regardless of whether the UK GROB rules render the gift ineffective for IHT. Form 709 must be filed for the year of the gift, reporting the full fair market value of the property transferred in US dollars.

Q: How is the US-UK treaty credit calculated where a GROB property is in both estates at death?

The US-UK Estate and Gift Tax Treaty provides a proportional credit — each country's tax is reduced by the share attributable to doubly taxed assets. The executor must prepare both the UK IHT return and the US Form 706 using consistent asset values and exchange rates so that the treaty credit eliminates the double charge on the GROB property.