One pound over £500,000: the stamp duty cliff facing first-time buyers
Hannah and Dev have rented the same two-bedroom flat for five years. They have a deposit, a mortgage agreement in principle and a Saturday routine of viewings. What they didn’t have, until a friend brought it up over dinner, was any sense that one number on a property listing could move their tax bill by thousands of pounds.
They are an illustrative couple, not real people, but the arithmetic they face is real. As first-time buyers in England, their stamp duty depends almost entirely on where a home sits between £300,000 and £500,000. And at the top of that range, the ground falls away.
Nothing to pay, then 5%
Stamp Duty Land Tax, or SDLT, applies when you buy property in England and Northern Ireland. First-time buyers get a relief: no SDLT on the first £300,000, then 5% on the portion from £300,001 to £500,000. To qualify, everyone buying has to be a first-time buyer. If Dev had owned a flat before, even years ago, the couple couldn’t claim it at all.
That makes the early viewings straightforward. A £300,000 flat costs Hannah and Dev nothing in stamp duty. At £350,000 the bill is £2,500, at £400,000 it is £5,000 and at £450,000 it is £7,500. GOV.UK’s own worked example sets the top of the range: a £500,000 first home means £10,000 in SDLT.
| Price | As first-time buyers | At standard rates |
|---|---|---|
| £300,000 | £0 | £5,000 |
| £350,000 | £2,500 | £7,500 |
| £400,000 | £5,000 | £10,000 |
| £450,000 | £7,500 | £12,500 |
| £500,000 | £10,000 | £15,000 |
The table shows something easy to miss. Anywhere between £300,000 and £500,000, the relief is worth exactly £5,000. That is the amount at stake when a price crosses the line.
One pound more
Above £500,000 the relief doesn’t shrink gradually. It goes. A first-time buyer paying more than £500,000 follows the same rules as anyone else buying their only home: nothing on the first £125,000, 2% on the portion from £125,001 to £250,000 and 5% on the portion from £250,001 to £925,000.
On a £500,001 house that comes to about £15,000: £2,500 on the 2% band plus £12,500 on the 5% band. One extra pound on the price adds roughly £5,000 to the tax.
What the cliff looks like on a Saturday
The house Hannah and Dev keep returning to is a three-bed listed at £510,000. At that price, as buyers who can no longer claim the relief, they would pay £15,500 in SDLT. At £500,000 the bill would be £10,000. On paper, a £10,000 difference in price is worth £15,500 to them: £10,000 less to find or borrow, and £5,500 less in tax.
Stamp duty also has to be paid within 14 days of completion. A solicitor or conveyancer usually pays it on completion day and adds it to their fees, so it is cash that needs to be ready alongside the deposit, not something that turns up later.
Scotland, Wales and second homes
These figures only apply in England and Northern Ireland. Scotland has Land and Buildings Transaction Tax and Wales has Land Transaction Tax, each with its own rates and reliefs. Buyers who will own more than one home usually pay 5% on top of the standard rates, which is a separate story.
Running your own numbers
The Money Engine stamp duty calculator works out SDLT, LBTT and LTT for a given price, and the budget planner shows how a tax bill sits next to a deposit, fees and monthly costs. HMRC also has its own SDLT calculator.
Hannah and Dev have since set their search filter to stop at £500,000. That isn’t because a £505,000 house would be a worse home. It’s because at £505,000 the stamp duty would be £15,250, against £9,750 at £495,000: £5,500 more tax for £10,000 more house.
Sources
- GOV.UK, Stamp Duty Land Tax: residential property rates (first-time buyer relief, standard rates, the £500,000 worked example and the 5% additional-property surcharge; fetched 8 Oct 2026)
- GOV.UK, Stamp Duty Land Tax: overview (England and Northern Ireland coverage, LBTT in Scotland, LTT in Wales, payment within 14 days of completion; fetched 8 Oct 2026)
- HMRC, Stamp Duty Land Tax calculator
- Revenue Scotland, Land and Buildings Transaction Tax
- Welsh Government, Land Transaction Tax guide
Disclaimer
This article is for illustration only and is not financial, tax or legal advice. Hannah and Dev are fictional examples. Figures are based on SDLT rates published on GOV.UK as at 8 October 2026 and can change. Your own bill depends on your circumstances, so check it with HMRC’s calculator or a conveyancer before you make an offer. Money Engine is not authorised or regulated by the Financial Conduct Authority.