Stamp Duty Land Tax (SDLT) is one of the largest one-off costs in a UK property purchase, and one of the most misunderstood. Many buyers think the rate applies to the whole purchase price. It does not — it works in bands, like income tax. Understanding how it is calculated changes how you think about offers near band boundaries.
Note: SDLT rates and thresholds are set by the government and can change at any Budget. The rates shown here reflect the standard rates as of April 2025, following the end of the temporary relief period. Always verify current rates at gov.uk/stamp-duty-land-tax before exchanging.
How SDLT is calculated: the band system
SDLT is charged on the amount within each band, not on the whole purchase price. This is the same principle as income tax — you do not pay the higher rate on the whole amount, only on the portion above the threshold.
Standard residential rates (from April 2025)
| Purchase price band | SDLT rate |
|---|---|
| Up to £125,000 | 0% |
| £125,001 to £250,000 | 2% |
| £250,001 to £925,000 | 5% |
| £925,001 to £1,500,000 | 10% |
| Over £1,500,000 | 12% |
Worked example: buying at £400,000 (standard rates)
| Band | Amount in band | Rate | Tax |
|---|---|---|---|
| £0–£125,000 | £125,000 | 0% | £0 |
| £125,001–£250,000 | £125,000 | 2% | £2,500 |
| £250,001–£400,000 | £150,000 | 5% | £7,500 |
| Total | £10,000 |
First-time buyer relief
First-time buyers — defined as buyers who have never owned a residential property anywhere in the world — qualify for relief that raises the nil-rate threshold.
First-time buyer rates (from April 2025)
| Purchase price band | SDLT rate |
|---|---|
| Up to £300,000 | 0% |
| £300,001 to £500,000 | 5% |
| Over £500,000 | Standard rates apply — no relief |
If you are buying a property over £500,000 as a first-time buyer, you receive no relief at all and pay standard rates on the entire purchase price.
Worked example: first-time buyer at £400,000
| Band | Amount in band | Rate | Tax |
|---|---|---|---|
| £0–£300,000 | £300,000 | 0% | £0 |
| £300,001–£400,000 | £100,000 | 5% | £5,000 |
| Total | £5,000 |
Saving versus standard rates: £5,000.
The additional dwelling surcharge
If you are buying an additional residential property — a buy-to-let, a second home, or a property while you still own another — you pay a surcharge on top of the standard rates. The surcharge rate has changed over time; verify the current rate at gov.uk before purchasing.
If you are selling your main residence and replacing it with a new one, the surcharge may not apply — but the rules around the replacement period are specific and worth confirming with a tax adviser.
What counts as “first-time buyer” — common misunderstandings
- Inherited property: If you have inherited a share in a property — even a small share — you are no longer a first-time buyer for SDLT purposes.
- Property abroad: If you have owned a property in another country, you do not qualify for first-time buyer relief in the UK.
- Joint purchase with a non-first-time buyer: If one person in a joint purchase has previously owned property, neither buyer qualifies for first-time buyer relief.
- Commercial property: Owning commercial property does not disqualify you from first-time buyer relief on a residential purchase.
When SDLT is paid
SDLT is due within 14 days of completion. Your conveyancing solicitor will calculate the amount, submit the SDLT return to HMRC, and collect the payment from you — usually as part of the completion funds. You do not deal with HMRC directly.
How SDLT affects your offer strategy
Because SDLT is calculated in bands, the tax due does not increase smoothly with price — it jumps at each threshold. Buying at £249,999 versus £250,001 makes a relatively small difference. But buying at £499,999 versus £500,001 as a first-time buyer costs you an additional £10,000 in SDLT (you move from full relief to standard rates on the whole price). These cliff edges are worth knowing when deciding what to offer.
A vendor asking £510,000 might accept £499,999 if they understand the buyer's position — the first-time buyer saves £10,000 in SDLT; the vendor gives up perhaps £3,000–£5,000 from the asking price. For the right buyer, offering slightly below key thresholds and explaining the SDLT saving is a legitimate negotiation frame.
SDLT on leasehold purchases
Buying a leasehold flat can involve two SDLT calculations: one on the purchase price and a separate calculation on the net present value of the ground rent over the remaining lease term, if the ground rent is above a certain threshold. In practice, peppercorn and low ground rent leases do not trigger additional SDLT. This is another reason to prefer leases with low or zero ground rent.
When you are comparing two properties at different price points, the SDLT difference is part of the real cost gap. HomesToCompare surfaces the full cost comparison — including tax — in the side-by-side analysis.
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