The 3% Stamp Duty Land Tax surcharge applies to any UK residential property purchase over £40,000 where, at the moment of completion, you (or your spouse/civil partner) own one or more other dwellings anywhere in the world — and the new property is not replacing your only or main residence. The surcharge stacks on top of the standard SDLT bands, so the entire purchase price is taxed at 3% more.
When the 3% surcharge actually applies
Four conditions all need to be true at completion for the surcharge to bite:
- The property is in England or Northern Ireland (Scotland has LBTT, Wales has LTT — both with similar additional rates but different mechanics).
- The property is residential (not commercial; mixed-use has its own rules).
- The purchase price is at least £40,000.
- At completion, you (and any "associated" person — primarily a spouse or civil partner you're not separated from) own at least one other residential dwelling anywhere in the world, and the new purchase is not replacing your main residence.
The "anywhere in the world" wording catches many people. A small flat in Lisbon, a beach house in Portugal that your parents put in joint names, a 25% share in a holiday cottage in Cornwall — all count. So does property held via a partnership or as a beneficial owner of a trust.
How much extra you actually pay
The 3% surcharge applies to every slice of the price, not just the slice above £250,000. So the difference between standard SDLT and surcharge SDLT grows with price. Below is the 2026/27 picture for an England purchase.
| Purchase price | Standard SDLT | With 3% surcharge | Extra |
|---|---|---|---|
| £200,000 | £0 | £6,000 | £6,000 |
| £300,000 | £2,500 | £11,500 | £9,000 |
| £400,000 | £7,500 | £19,500 | £12,000 |
| £500,000 | £12,500 | £27,500 | £15,000 |
| £750,000 | £25,000 | £47,500 | £22,500 |
| £1,000,000 | £41,250 | £71,250 | £30,000 |
For a personal calculation including any leasehold, multiple-dwellings, or first-time-buyer adjustments, see the second-home SDLT calculator.
The replacement-of-main-residence exception
The biggest loophole isn't a loophole — it's a deliberate carve-out for the genuine case of moving house. If you're selling your current main residence and buying a new one to replace it, the 3% surcharge doesn't apply, even if you own other property (e.g. a buy-to-let).
Two scenarios for the exception:
- Simultaneous transactions. You sell your current main residence on the same day you complete the new one (the normal moving-day chain). No surcharge.
- You sell first, buy later. You sold your previous main residence within the 3 years before completing the new purchase. No surcharge — provided that previous property was lived in as your main residence at some point during your ownership.
What if you buy first and sell later? The surcharge applies at completion — but you can reclaim it if you sell your previous main residence within 36 months. See the SDLT refund guide.
Four scenarios that catch people out
Scenario 1: Buying a holiday home while keeping your main residence
You own and live in your main home. You buy a cottage in the Lakes. The surcharge applies — you now own two properties, and the cottage is the second purchase. Surcharge on the full cottage price.
Scenario 2: Helping an adult child buy their first flat
Your daughter is buying her first flat. To help her get the mortgage, you go on the title as a joint owner. You already own your main home. The surcharge applies to the full purchase price of your daughter's flat — because at completion, you (the parent) own two properties and the new one is not replacing your main residence. Your daughter loses her first-time-buyer relief in the process. The fix: have your daughter buy in her name alone (with a parent-backed guarantor mortgage or a deed of trust, not a joint legal title) — see the buying with parents' help guide.
Scenario 3: Inheriting a share of a property while in a chain
You're mid-purchase on your first home. A relative dies and leaves you a 30% share of their flat. If the inheritance completes before your purchase completes, you now own "another property" at the moment of your purchase — and the surcharge applies. HMRC allows the inheritance to be ignored for surcharge purposes only if you've held the inherited interest for less than three years AND it's a partial interest (less than 50%).
Scenario 4: Your spouse owns a property you didn't know about
Your new spouse, before you married, bought a flat for their mother to live in. They still own it. When you buy a property together, HMRC treats your spouse's property as yours too — the surcharge applies to your joint purchase. The legal jargon is "deeming provisions for spouses and civil partners." Marriage Allowance is not the only thing that gets bundled.
Four legitimate ways to avoid the surcharge
- Sell first, buy after. If you can structure the chain so your old main residence sells before the new one completes (even by an hour), the surcharge doesn't apply. Sellers' solicitors can usually arrange same-day completions in the right order.
- Use the 36-month refund window. If you must buy first, pay the surcharge, and reclaim it after selling within 36 months. See the refund mechanics.
- Mixed-use rates. A property that includes commercial elements (a flat above a shop, a working farm with land used for grazing) qualifies for non-residential SDLT rates — much lower at the bottom and no 3% surcharge. HMRC challenges aggressive mixed-use claims aggressively; see the mixed-use guide.
- Below £40,000. The surcharge doesn't apply to a residential purchase under £40,000 (rare in the UK but relevant for small park homes, lock-up garages, etc.).
How it differs in Scotland and Wales
The 3% surcharge described above is the rUK rule (England + Northern Ireland). Scotland and Wales operate their own land transaction taxes, with similar but distinct rules:
- Scotland — LBTT Additional Dwelling Supplement (ADS). 8% on the full price, with an 18-month replacement window (the Scottish Parliament increased ADS from 6% in 2024 and extended the refund window).
- Wales — LTT higher residential rates. Starting at 4% on the slice up to £180,000 and rising with the slabs above. Different threshold structure from England.
Cross-border purchases by the same person — e.g. a Scottish resident buying an English investment property — apply the rules of the country where the property sits, not where the buyer lives.
Common HMRC challenges and traps
The "main residence" definition
The legislation defines main residence as the place you actually live as a home — not the place you registered for council tax, voted from, or kept your post coming to. If HMRC investigates and finds you spent more time at the "other" property (e.g. a holiday home), they can recharacterise which property was the main residence — potentially making your replacement-exception claim invalid. Keep evidence: utility bills, GP registration, council tax, where children attend school.
The 3-year window is calendar months, not tax years. Buy on 1 April 2024, you have until 1 April 2027 to sell the old property and claim the refund.
If you're separated but not divorced, HMRC's spouse-deeming rules still treat you as one unit — unless you can show you are "permanently separated." Court orders, separation agreements, and clear separate addresses with documentary evidence are the safest route.
Sources and methodology
The figures above are HMRC's published Stamp Duty Land Tax bands and additional rate rules for 2026/27. See the SDLT residential rates and the HMRC guidance on buying an additional residential property. This page is educational only and not legal or tax advice — for a complex purchase, see the tax adviser editorial recommendation. The methodology page documents how every page is researched and reviewed.
Related SDLT guides
- Standard SDLT calculator — for a single-property purchase
- SDLT second-home calculator — calculate the 3% surcharge for your purchase
- How to claim back the 3% surcharge — sold within 36 months
- SDLT non-resident surcharge — the 2% extra for overseas buyers
- SDLT on mixed-use property — commercial vs residential rates
- SDLT on inherited property — when it applies, when it doesn't
- First-time buyer guide — the FTB relief and how to qualify
- BTL landlord guide — full tax picture for landlords
- All property content
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