US Gift Tax UK Inheritance Tax Gifting: Cross-Border Guide
US gift tax UK inheritance tax gifting explained for wealthy transatlantic families: sequence PETs, exemptions and situs to cut tax. Book a confidential review.
Two clocks, one family fortune
Lifetime gifting works in opposite directions on either side of the Atlantic. The UK rewards giving early: most outright gifts fall out of the estate entirely after seven years. The US taxes the giver at once, drawing down a unified lifetime exemption. Transatlantic families must sequence gifts by asset situs and donor status.
Why the two systems pull in opposite directions
The structural divergence is not a technicality — it drives the entire planning sequence for a family with US and UK exposure. The United Kingdom operates a cumulative estate-and-gift system in which a lifetime gift to an individual is normally a potentially exempt transfer (PET). No inheritance tax is payable at the time of the gift. If the donor survives seven years, the gift drops out of the estate completely. If the donor dies within seven years, the gift is brought back into the cumulation, uses up the nil-rate band first, and any excess is charged — with taper relief reducing the tax (not the value) where death occurs more than three years after the gift.
The United States, by contrast, imposes gift tax on the donor at the moment of transfer, measured against a unified credit shared between lifetime gifts and the estate. There is no seven-year survivorship reward. A gift is either sheltered by the annual exclusion, sheltered by the lifetime exemption, or taxable — and once exemption is consumed, it is gone. Crucially, the US system also removes future appreciation from the estate, which is the real prize: a gift made today at $2m that grows to $6m has moved $4m of growth outside the transfer tax net.
So the UK says give early and survive. The US says give early and use exemption while it is generous. Both point toward early gifting, but the cost, reporting and asset selection differ profoundly. Our cross-border tax planning team sees more value destroyed by gifting the wrong asset than by gifting at the wrong time.
Who is actually exposed? Residence, domicile and citizenship
Before any gift is made, three status questions must be answered — and they are answered differently in each jurisdiction.
The US test: citizenship and domicile, not residence
US gift tax reaches every US citizen and every individual domiciled in the United States for transfer tax purposes, wherever in the world they and their assets sit. A US citizen living in London for thirty years is fully within the US gift tax net on worldwide assets. A non-domiciled, non-citizen donor is exposed only on gifts of US-situs tangible property — chiefly US real estate and tangible personal property physically located in the US. Notably, gifts of US shares by a non-domiciled donor are generally outside US gift tax, even though those same shares are inside the US estate tax net at death. That asymmetry is one of the most valuable planning openings available to non-US spouses in mixed-nationality families.
US transfer tax domicile is a facts-and-circumstances test — physical presence plus intent to remain indefinitely. It is not the same as income tax residence, and it is not the same as UK domicile. A green card holder is generally income-tax resident but is not automatically transfer-tax domiciled, though in practice the two usually align.
The UK test: long-term residence has replaced domicile
The UK has moved from a domicile-based inheritance tax system to one built on long-term residence. Broadly, an individual who has been UK resident for a defined number of years within the preceding twenty becomes exposed to IHT on worldwide assets, and that exposure persists for a "tail" period after departure that scales with the length of prior residence. Those who fall short remain exposed only on UK-situs assets. For internationally mobile families this replaced a familiar deemed-domicile clock with a new one, and gifting strategy must be recalibrated against it — see our note on UK tax services for how this interacts with trust structures.
The planning consequence is stark. A family arriving in the UK has a window during which non-UK assets can be gifted, or settled, entirely outside the UK IHT net. Once long-term residence bites, worldwide gifting is caught and the seven-year clock becomes the only escape route. Timing the gift against the residence clock is often worth more than any structure.
US gift tax vs UK inheritance tax gifting: side-by-side
| Feature | United States (IRS) | United Kingdom (HMRC) |
|---|---|---|
| Who is taxed | The donor | The estate (or donee) if donor dies within seven years |
| Tax at time of gift | Yes, once exemption is exhausted | No tax on a PET at the time of gift |
| Survivorship rule | None — gift is complete immediately | Seven-year clock; full exemption if survived |
| Partial relief | None | Taper relief on tax where death is 3-7 years after gift |
| Small-gift shelter | Annual per-donee exclusion, indexed | Annual exemption, small gifts, marriage gifts, normal expenditure out of income |
| Spousal transfers | Unlimited to a US-citizen spouse; capped annual amount to a non-citizen spouse | Unlimited between spouses where both have equivalent IHT status; capped where recipient does not |
| Reach for non-domiciliaries | US-situs tangible property only (real estate, tangibles) | UK-situs assets only, until long-term residence applies |
| Basis / CGT consequence | Carryover basis to donee; no step-up | Deemed market-value disposal for CGT; gain may crystallise on donor |
| Reporting | Form 709 gift tax return | No return for a PET; IHT403 on death; IHT100 for chargeable transfers |
What is a potentially exempt transfer, and where does it fail?
A PET is an outright lifetime gift from one individual to another (or to certain trusts for disabled persons) which is treated as exempt unless the donor dies within seven years. The elegance of the PET is that no return is filed and no tax is paid at the time. The danger is that families treat it as done — and then breach it.
The most common failure is the gift with reservation of benefit. If the donor continues to enjoy the asset — living in the gifted house, drawing income from the gifted portfolio, retaining use of the gifted artwork — the seven-year clock never meaningfully starts. HMRC treats the asset as remaining in the estate. A parallel regime, the pre-owned assets charge, imposes an income tax charge where the reservation rules are technically sidestepped but the benefit persists. Cross-border families are especially prone to this because the same house is often a second home used on visits.
The second failure is failing to distinguish a PET from a chargeable lifetime transfer. Gifts into most trusts are not PETs at all; they are immediately chargeable at the lifetime rate on value above the available nil-rate band, with a further charge if death follows within seven years. A family that assumes "seven years and it's clean" while settling a discretionary trust has misread the regime entirely. Our trusts and estate planning specialists model both routes before any transfer is executed.
The third failure is order of gifts. Because the nil-rate band is applied to the earliest gifts in the seven-year cumulation, the first gift made absorbs the band and later gifts bear tax. Sequencing gifts so the most appreciating assets go first — and the most likely-to-be-taxed gifts go to donees best able to bear the charge — is a genuine planning decision, not administrative detail.
How does the US annual exclusion work for a UK-resident American?
Every US person may give up to an indexed annual amount per recipient per year without touching lifetime exemption and, in most cases, without filing. There is no limit on the number of recipients. A married US couple can elect to split gifts, doubling the per-recipient shelter, though gift-splitting requires a Form 709 filing even when no tax is due.
For a US citizen living in the UK, the annual exclusion is a quietly powerful tool because it is also often covered by UK exemptions or, failing that, simply starts a seven-year clock at a value low enough that the nil-rate band absorbs it. Systematic annual gifting into a properly documented pattern can move very substantial value over a decade with no US tax, no UK tax, and no reporting drama.
Two US-specific traps deserve emphasis:
- Non-citizen spouse gifts. The unlimited marital deduction applies only where the recipient spouse is a US citizen. Gifts to a non-citizen spouse — extremely common in Anglo-American marriages — are limited to an indexed annual amount. Retitling a jointly held London property or moving funds into a spouse's account can be a reportable, exemption-consuming gift without anyone intending it.
- Gifts of appreciated assets carry basis over. The donee inherits the donor's cost basis. Gifting a low-basis holding transfers a latent US capital gains liability rather than eliminating it, and forfeits the step-up that death would have delivered. For very low-basis assets held by an elderly donor, holding to death is frequently the better US answer — and directly conflicts with the UK's incentive to give early.
Does UK CGT bite when you make a PET?
Yes, and this is where transatlantic gifting most often goes wrong. A lifetime gift is a disposal at market value for UK capital gains tax purposes, even though no cash changes hands. Gifting a rental flat or a private company holding can crystallise a substantial CGT bill for the donor in the year of the gift, with hold-over relief available only for particular categories of asset such as qualifying business assets or transfers into relevant property trusts.
Layer the US on top and the picture is worse: the US treats the same gift as a non-realisation event (no gain, carryover basis), so there is no matching US capital gain against which to claim foreign tax credit. The UK CGT is paid with no US relief, and the US latent gain remains in the donee's hands. This foreign-tax-credit mismatch is the single most expensive feature of cross-border lifetime gifting, and it is entirely avoidable with asset selection. Cash, recently acquired assets, and assets standing at little or no gain are the natural candidates for gifting; deeply appreciated legacy holdings usually are not.
Which assets should cross the Atlantic, and which should stay put?
Asset situs determines exposure in both systems, and the two situs rulebooks do not align.
- US real estate. Within US gift tax for every donor, US or not. Gifting it directly is rarely efficient; structuring at acquisition is far better than restructuring later.
- US publicly traded shares. Outside US gift tax for a non-domiciled donor, but inside US estate tax at death. A non-US-domiciled parent holding US equities has a strong incentive to gift during life rather than hold to death — the reverse of the usual advice.
- UK real estate. Within UK IHT for everyone, regardless of residence or the structure holding it. A gift starts the seven-year clock; a reservation of benefit stops it.
- Cash held offshore. The cleanest gifting asset in both systems — no CGT disposal in the UK, no carryover-basis problem in the US, straightforward valuation for both returns.
- Private company shares. Potentially eligible for UK business relief and hold-over relief, but valuation-sensitive and often a US reporting event for the donee. Founders should read our guidance on high-net-worth planning before any equity transfer.
What must be reported, and by whom?
Reporting obligations are asymmetric and the penalties are borne by different parties.
On the US side, the donor files Form 709 for any gift exceeding the annual exclusion, any gift of a future interest, any gift-splitting election, and gifts to a non-citizen spouse above the annual cap. Filing is required even when no tax is payable because exemption absorbs the gift — and filing is what starts the statute of limitations running on the reported valuation. Under-reporting a hard-to-value asset without adequate disclosure leaves the valuation open indefinitely.
On the recipient side, a US person who receives a large gift or bequest from a non-US person files Form 3520. No tax arises, but the penalty regime for late or missed filing is severe and calculated as a percentage of the amount received. In practice this is the most frequently missed form in Anglo-American families: a British grandparent gifts to a US-citizen grandchild, no one thinks the IRS is involved, and a penalty exposure quietly accrues. Where filings have been missed across several years, our IRS streamlined filing team can assess whether a compliance programme is available.
On the UK side, an outright PET requires no return at the time. The obligation crystallises on death, when the personal representatives must disclose lifetime gifts within seven years — and, for gifts with reservation, without any time limit. Contemporaneous documentation is therefore essential: a gift the family remembers but cannot evidence is a gift HMRC may decline to accept as having been made when claimed. Chargeable lifetime transfers into trust require reporting at the time.
Sequencing: a practical order of operations
For a family with exposure on both sides, the order in which decisions are taken matters more than any single technique.
- Fix status first. Establish each family member's US citizenship or transfer-tax domicile and UK long-term residence position, including any tail period. Gifting before this is guesswork.
- Identify the constrained side. Where only one spouse is a US person, the non-US spouse is usually the more efficient donor for non-US assets. Ensuring assets are held by the right spouse — well before any gift — is the highest-value single step in most plans.
- Use the arrival window. Gifts of non-UK assets made before UK long-term residence applies escape UK IHT entirely, with no seven-year wait.
- Select assets for basis, not sentiment. Give high-basis and cash assets; retain low-basis assets for the US step-up where the donor's UK exposure permits.
- Start the clock early and document it. The seven-year clock rewards nothing but survival. Every year of delay is a year of relief forgone.
- Layer annual exemptions permanently. The UK's normal-expenditure-out-of-income exemption and the US annual exclusion, used together and evidenced properly, move meaningful value with zero tax friction and zero clock risk.
Common mistakes we are asked to unwind
Three patterns recur in remediation work. First, the family home gifted to children while the parents continue to live in it — a textbook reservation of benefit that achieves nothing for IHT and may create a US gift with carryover basis. Second, a joint account or jointly titled property between a US citizen and a non-citizen spouse, quietly generating reportable gifts each time funds are contributed unevenly. Third, a UK trust settled by a family that later includes a US beneficiary, converting an ordinary UK arrangement into a foreign trust with a US reporting burden and potentially punitive throwback treatment on distributions.
None of these are exotic. All of them are cheap to prevent and expensive to correct. Where correction is needed, the sequence matters: fix the reporting position before restructuring the assets, because restructuring often triggers the very disclosures that were missed.
Official guidance and source material
The positions above are drawn from the primary guidance published by both revenue authorities. Rates and thresholds change; always confirm against the current text before acting.
Speak to us in confidence
Lifetime gifting across the Atlantic is not a matter of choosing the better regime — it is a matter of sequencing gifts so that neither regime penalises what the other rewards. The families who succeed are those who model both systems together, before the first transfer is made, and who document every step. If you are considering gifts to children, funding a trust, equalising assets between spouses, or planning an exit that will create liquidity you intend to pass on, we would welcome a conversation. Our private client tax team advises US and UK connected families on exactly these decisions, in complete confidence and without obligation. Contact Jungle Tax to arrange a confidential consultation.
