Stamp duty explained, and the traps in it

Stamp Duty Land Tax is the tax you pay on buying property in England and Northern Ireland. Scotland charges Land and Buildings Transaction Tax and Wales charges Land Transaction Tax; both work on the same principle with different bands, so check yours rather than assuming.

It is charged in slices

The most common misunderstanding. Stamp duty is not a single percentage of the purchase price. Each band applies only to the portion of the price falling inside it, like income tax.

So a price crossing into a higher band does not reprice the whole purchase at the higher rate. Only the slice above the threshold is charged at it. This matters because people talk themselves out of offers on the mistaken belief that one pound over a threshold costs them thousands. It does not; that has not been how it works for over a decade.

First-time buyer relief

First-time buyers pay nothing up to a threshold and a reduced rate above it, and lose the relief entirely above a ceiling. Two traps.

The cliff edge is real. Unlike the bands, relief is all-or-nothing: buy a pound above the ceiling and the entire relief disappears, which genuinely can cost thousands for a trivial price difference. This is the one place where negotiating just below a threshold is worth real money.

"First-time buyer" is stricter than it sounds. It means never having owned property anywhere in the world, including inherited shares and including property owned abroad. If either buyer in a joint purchase has owned before, the relief is lost for both.

The additional property surcharge

Buying an additional residential property, a second home or a buy-to-let, adds a surcharge on top of the standard rates across every band. It is a substantial amount and it catches people in situations they did not think of as owning two homes:

• Buying before selling. If completion on the new place happens before completion on the old one, you own two properties on the day and the surcharge applies. It is reclaimable if you sell the previous main residence within the statutory window, but you must fund it up front and then claim it back.
• Owning any share of another property, including an inherited fraction.
• A spouse's separate property. Married couples and civil partners are generally treated as one unit for this test.

Non-UK residents pay a further surcharge on top.

Other things worth knowing

• It is due quickly. The return and payment are due within a short statutory window of completion, and your conveyancer normally handles both. It is not added to the mortgage; it is cash you need on the day.
• Mixed-use and multiple dwellings can be taxed differently, sometimes far more favourably. If you are buying anything with an annexe, a flat above a shop, or several units, this is worth specific advice rather than a calculator.
• Uninhabitable property has been the subject of aggressive reclaim schemes. The bar is much higher than "needed renovation", and HMRC has pursued claims successfully. Treat cold-call reclaim offers with suspicion.
• Chattels are excluded. Genuinely free-standing items can be apportioned out of the price, which slightly reduces the duty. Inflating that apportionment to duck a band is tax evasion, and it is checked.

Every UK area page on this site shows the duty on an average home in that district at both standard and first-time buyer rates, which is a quick way to see the real cost of moving somewhere.