Stamp Duty Land Tax is a progressive tax on the purchase price of a residential property in England and Northern Ireland, and the bands bite harder than most buyers expect. UK Stamp Duty Calculator below works the liability in seconds. The first £125,000 is free. The next £125,000, from £125,001 to £250,000, is taxed at 2%. The slice from £250,001 to £925,000 carries 5%. The band from £925,001 to £1.5 million is charged at 10%. Everything above £1.5 million pays 12%. These are the current standard residential rates, and they apply to the portion of the price inside each band, not to the whole price.
The additional property surcharge
Buy a second home, a buy-to-let, or any additional residential property and you pay 5% on top of every band. The surcharge applies to the full purchase price, not just the marginal slice. A £300,000 primary home owes £5,000. The same £300,000 as an additional property owes £20,000. That is the 5% surcharge adding £15,000 to the base bill, and it is the single biggest trap for investors.
First-time buyer relief
First-time buyers get a cleaner deal. Relief wipes out the tax entirely on the first £300,000 of a qualifying purchase, then charges 5% on the portion from £300,001 to £500,000. A £300,000 first home therefore owes £0. The relief exists to pull younger buyers onto the ladder, and it works because the zero band covers the price point where most first purchases sit.
Worked example
Run the three cases side by side. A £300,000 primary home: £0 on the first £125,000, £2,500 on the 2% band, £2,500 on the 5% band, for £5,000 total. A £300,000 first-time purchase: £0 across the board. A £300,000 additional property: the £5,000 base bill plus £15,000 of surcharge, for £20,000. The spread between a first-time buyer and an investor on the same price is the entire £20,000.
What the bands mean in practice
The progressive structure punishes the jump from £250,000 to £250,001 far less than buyers fear, because only the marginal slice moves up a band. The real cost is the surcharge and the top-end rates. Price a purchase above £1.5 million and the 12% band applies to every pound above that line. Plan the structure before you bid, because the tax is due within 14 days of completion and the penalty for late payment is automatic.