An American buying a home in England or Northern Ireland can pay three layers of Stamp Duty Land Tax at once: the standard residential rates, a 5% surcharge if the purchase leaves them owning more than one dwelling anywhere in the world, and a further 2% surcharge if they were not physically present in the UK for at least 183 days in the twelve months before completion. On the top slice of an expensive property that combination reaches 19%. The good news is that the 2% non-resident surcharge is refundable if you go on to spend enough time in the UK after the purchase, and that the residence test for SDLT is its own test — it has nothing to do with the Statutory Residence Test, your visa, or your US citizenship. Getting the day count right, and knowing which reliefs you can and cannot claim, is often worth tens of thousands of pounds on a single transaction.
The three layers, in the order they apply
SDLT on residential property in England and Northern Ireland is charged in slices, like income tax. Each slice of the purchase price is taxed at its own rate, and the surcharges are added as extra percentage points to every slice — not as a separate lump sum. That structure is why the surcharges hurt so much at the bottom of the price range as well as the top: the 5% and 2% apply even to the portion of the price that would otherwise be taxed at 0%.
Scotland and Wales are outside SDLT entirely. Scotland charges Land and Buildings Transaction Tax, Wales charges Land Transaction Tax, and both have their own rates and their own surcharge rules. Everything in this guide is about England and Northern Ireland.
Layer one: the standard residential rates
The standard residential SDLT bands published on GOV.UK are as follows for a purchase of a single dwelling that will be your only property:
- Up to £125,000 — 0%
- £125,001 to £250,000 — 2%
- £250,001 to £925,000 — 5%
- £925,001 to £1,500,000 — 10%
- Above £1,500,000 — 12%
Layer two: the 5% higher rates for additional dwellings
If, at the end of the day of completion, you own an interest in more than one dwelling, an extra 5 percentage points is added to every band. This is the surcharge that catches Americans most often, and the reason is simple: HMRC counts dwellings you own anywhere in the world, not just in the UK. A house in Connecticut, a condo in Florida, a share of a family property in California — all of it counts.
So an American couple relocating to London who keep their US home and buy a flat in Fulham are buying an 'additional dwelling' in HMRC's eyes, even though the London flat will be their only home in the UK and the only place they actually live. The 5% applies from the first pound.
There is an important escape route. If you are replacing your main residence — that is, you sold your previous main home and are buying a new main home — the surcharge does not apply, and this works with an overseas former main residence too. If you buy the UK property first and sell the US one afterwards, you must pay the surcharge up front and then reclaim it, provided the old home is sold within 36 months of the new purchase.
Layer three: the 2% non-UK resident surcharge
Since 1 April 2021, purchasers of residential property in England and Northern Ireland who are not UK resident for SDLT purposes pay a further 2 percentage points on top of everything else, including on top of the 5% additional-dwellings rates. HMRC's guidance on the rates of SDLT for non-UK residents sets out the test and the refund mechanism.
This surcharge has nothing to do with citizenship or immigration status. A British citizen who has been living in Dubai for a decade is non-resident for SDLT and pays it. An American on a Skilled Worker visa who has already been living in London for two years is UK resident for SDLT and does not.
The SDLT residence test is not the Statutory Residence Test
This is the single most misunderstood point, and the one that costs people the most money. For SDLT, you are UK resident if you were present in the UK on at least 183 days during any continuous 365-day period falling within the window that starts 364 days before the effective date of the transaction and ends 365 days after it. Presence means being in the UK at the end of the day — midnight — which is the same midnight convention used elsewhere in UK tax, but the rest of the test is entirely different.
There are no ties, no automatic overseas tests, no split-year treatment, no work-day tests. It is a pure day count over a rolling 365-day window. Someone who is UK resident under the Statutory Residence Test for income tax may still be non-resident for SDLT, and vice versa. Treat them as two separate exercises and count days for each one on its own terms.
For a couple buying jointly, the rule is unforgiving: if either purchaser is non-resident, the 2% applies to the whole transaction. There is one exception — spouses and civil partners who are living together are treated as one for this purpose, so if one of you meets the 183-day test, the surcharge does not apply.
The forward-looking window is why the surcharge is refundable
Notice that the 365-day window runs both backwards and forwards from completion. That means a purchase made shortly after arriving in the UK can become surcharge-free retrospectively once you have accumulated 183 days of presence in the following year.
The mechanics are that you pay the 2% at completion on the SDLT return, and then, once the 183-day condition is met, you apply to HMRC for a refund. The claim must be made within two years of the effective date of the transaction. HMRC does not chase you for this — nobody writes to tell you that you have become resident. You have to track your own days and make the claim.
For an American relocating on a work visa and buying a home in the first few months after arrival, this is usually pure timing: the 2% is a cash-flow cost for a year, not a real cost, provided somebody remembers to file the reclaim.
What the stack actually costs: a worked example
Take an American couple buying a £1,200,000 house in London. They have just arrived on a visa, so they are non-resident for SDLT at completion, and they have kept their home in the United States.
Standard SDLT on £1,200,000 comes to £63,750 — nothing on the first £125,000, £2,500 on the next £125,000, £33,750 on the slice to £925,000, and £27,500 on the slice above it. The 5% additional-dwellings surcharge adds 5% of the full £1,200,000, which is £60,000. The 2% non-resident surcharge adds a further £24,000. The total is £147,750, against £63,750 for a UK-resident first-home buyer at the same price. The surcharges have more than doubled the bill.
Now change two facts. They sell the US home within 36 months and reclaim the 5%, and they spend 183 days in the UK within the following year and reclaim the 2%. The bill falls back to £63,750 and £84,000 comes back. Neither refund is automatic. Both have deadlines.
First-time buyers' relief is almost never available
First-time buyers' relief gives a 0% band up to £300,000 and 5% on the portion from £300,001 to £500,000, with no relief at all if the price exceeds £500,000. To qualify, you must never have owned a major interest in a dwelling anywhere in the world. Again, worldwide — a property previously owned in the US disqualifies you permanently, even if it was sold years ago and even if you have never owned anything in the UK.
In practice very few American purchasers qualify, and the £500,000 cliff edge rules out most London purchases in any event. Where it does apply, note that the relief and the 2% non-resident surcharge can operate together: a genuinely first-time buyer who is non-resident gets the relief bands plus 2 percentage points on each.
Buying through a company: the 17% flat rate
Americans sometimes ask about buying UK residential property through a US LLC or a corporate structure. Be careful. Where a company or other non-natural person acquires a single dwelling for more than £500,000, a flat 17% rate can apply to the entire consideration, unless a relief such as the property rental business relief is available and maintained.
On top of that, enveloped residential property can attract the Annual Tax on Enveloped Dwellings, an annual charge based on the property value. And from the US side, a single-member LLC holding UK real property raises its own questions about entity classification and how the UK and US characterise the income. Corporate ownership of a UK home is rarely the right answer for an individual buyer and frequently an expensive one.
Mixed-use and six-or-more dwellings: the genuine planning points
Two provisions in the SDLT code are genuinely valuable and genuinely used. First, if a transaction includes both residential and non-residential elements — a flat above a shop, a house with a paddock let commercially — the whole transaction is charged at the non-residential rates, which top out at 5% and carry no surcharges at all. Second, if you buy six or more dwellings in a single transaction, they can be treated as non-residential.
These are legitimate rules, but HMRC challenges aggressive mixed-use claims hard, and a strip of grazing land attached to a country house is not automatically non-residential. If somebody offers you a stamp duty 'reclaim' on a contingent-fee basis on the strength of a mixed-use argument, get an independent view before signing.
What the IRS does with your stamp duty
SDLT is not a creditable foreign income tax. You cannot claim it as a foreign tax credit on Form 1116, because it is a transfer tax on the acquisition of property, not a tax on income.
What it does do is add to your US cost basis in the property. Every pound of SDLT you pay increases the basis you will subtract from the sale proceeds when you eventually sell, which reduces your US capital gain at that point. Keep the SDLT5 certificate and the completion statement permanently — you will need them years later, and by then the conveyancer's file may be long gone.
That basis point matters more than it sounds, because the US will tax the gain on your UK home in dollars, and if sterling has moved against you the dollar gain can be far larger than the sterling one. Our guide to selling a UK home as a US citizen covers the currency trap and the limits of the section 121 exclusion in detail.
The mortgage currency trap that comes with the house
One further US consequence deserves a mention, because it arrives with the property and surprises almost everyone. If you take out a sterling mortgage and later repay or refinance it when the dollar has strengthened, the US can treat the reduction in the dollar value of the debt as a foreign currency gain taxable as ordinary income under section 988 — even though in sterling terms you simply repaid what you borrowed.
There is no equivalent charge in the UK, and no foreign tax credit to offset it, because the UK taxed nothing. It is a genuine US-only cost of owning a UK home with a UK mortgage, and it is worth modelling before you fix a large loan.
Timing decisions worth making before you exchange
- Count your UK days for SDLT separately from your SRT day count, and check whether pushing completion back a few weeks would take you over 183 days in the backward-looking window.
- If you are selling a US property, establish whether it can complete before, or within 36 months of, the UK purchase — that decides whether the 5% is avoided or merely reclaimed.
- Confirm whether you and your spouse are 'living together' for SDLT purposes, because that is what lets one person's UK residence cover both.
- If you are buying with a parent or a trust, check the effect on both surcharges before the structure is fixed — adding a non-resident co-purchaser can cost 2% of the whole price.
- Ask your conveyancer in writing to note the surcharge reclaim deadlines on the file, and diarise them yourself as well.
Where the UK and US sides need to be looked at together
A UK property purchase for an American is rarely just a UK transaction. The purchase interacts with your worldwide US filing position, your basis and future gain, any rental income if you let the property out, the currency position on the mortgage, and — if the property is expensive and you stay long enough — eventually with both US estate tax and UK inheritance tax on the same asset.
Estimate the UK side first with our UK stamp duty calculator, which handles the standard bands and the additional-dwellings surcharge, then add the 2% if you are non-resident at completion. Then look at the US consequences before you commit to a structure.
