England's £500,000 first-time buyer stamp duty cliff produces a smaller round-number spike than two nearby prices with no tax significance at all — but a far deeper and slower-recovering dip immediately above it. Testing all three side by side on 2025 HM Land Registry data shows round-number pricing explains most of what looks like "threshold bunching", while the £500,000 line itself still does something the other two don't.
The test: £500,000 against two round numbers with no tax significance
England's first-time buyer stamp duty relief runs 0% up to £300,000 and 5% from £300,001 to £500,000 — then disappears entirely above £500,000, with no partial benefit. If that cash cliff is pulling sales toward exactly £500,000, the spike there should look different from an ordinary round number with no tax effect attached.
£450,000 and £550,000 are the obvious controls: both are round, both sit the same £50,000 distance from £500,000, and neither carries any change in stamp duty rate or relief. Using England-only, category-A HM Land Registry sales for 2025 (more than 67,000 transactions across the three price windows), each price was tested against the £5,000 band immediately below it, expressed as a multiple of that band's per-£1 density — the same control method already applied to Wales's Land Transaction Tax bands.
| Price point | Band immediately below | Sales exactly on the price | Spike multiple vs baseline |
|---|---|---|---|
| £450,000 | 3,733 (£445,000–£449,999) | 6,634 | ~8,888× |
| £500,000 | 3,324 (£495,000–£499,999) | 4,499 | ~6,769× |
| £550,000 | 1,938 (£545,000–£549,999) | 3,697 | ~9,537× |
£500,000 — the only one of the three with a genuine tax boundary — actually produces the weakest round-number spike. Round-number pricing on its own doesn't explain why £500,000 would behave any differently from £450,000 or £550,000.
Where £500,000 does behave differently: the dip above the line
A spike at a round number says little on its own. What separates a real threshold from an ordinary round number is what happens immediately afterwards — how deep the shortfall is, and how long it takes sales to climb back to a normal rate.
| Threshold | Dead-zone sales (next £4,999) | Dead-zone depth vs baseline | Distance until sales recover to baseline |
|---|---|---|---|
| £450,000 | 891 | 24% of baseline | +£10,000 |
| £500,000 | 491 | 15% of baseline | +£25,000 |
| £550,000 | 451 | 23% of baseline | +£10,000 |
Both £450,000 and £550,000 fall to roughly a quarter of their baseline rate immediately above the line, then recover within £10,000. £500,000 falls further — to 15% of baseline — and takes two and a half times longer, not recovering to a normal sales rate until roughly £525,000. That gap is consistent with the already-published finding that Wales's genuine Land Transaction Tax boundary at £400,000 showed the same signature: a deeper dip and a slower recovery than its own round-number controls.
Why £500,000 is different: one of the three carries a real cash cliff
The mechanism is visible directly in the stamp duty calculation. A first-time buyer's bill rises smoothly by a few pence for every extra £1 at £450,000 and £550,000 — there's no rate or relief change at either price. At £500,000, the same £1 costs an extra £5,000.10, because first-time buyer relief is withdrawn in full the moment the price exceeds it.
| Price | First-time buyer stamp duty | Cost of the next £1 |
|---|---|---|
| £449,999 → £450,001 | £7,499.95 → £7,500.05 | +£0.10 |
| £499,999 → £500,001 | £9,999.95 → £15,000.05 | +£5,000.10 |
| £549,999 → £550,001 | £17,499.95 → £17,500.05 | +£0.10 |
That's the only structural difference between the three prices tested, and it lines up with the only one that shows a deeper, slower-recovering gap in the actual sales data. Land Registry records don't identify which buyers are first-time buyers, so this can't be confirmed sale-by-sale — but an aggregate effect isolated to the one price with a real cash cliff, absent at two otherwise-identical round numbers, is the pattern a genuine threshold effect would produce.
What this means in practice
Round-number pricing is clearly the dominant force at all three prices — without it, none of £450,000, £500,000 or £550,000 would see thousands of sales landing on a single exact figure. But the £500,000 stamp duty line adds something on top of that baseline: a wider, longer-lasting gap in sales just above it than an ordinary round number produces on its own. For a seller or agent pricing a property close to £500,000, the practical takeaway is descriptive, not prescriptive — the data shows where other transactions have settled, not where any individual sale should land.
This analysis uses more than 67,000 HM Land Registry Price Paid transactions (category A, England, 2025 calendar year) and HMRC's current stamp duty rates and first-time buyer relief rules, queried 6 November 2026. For the original £500,000 cliff mechanics and where these sales concentrate geographically, see The £500k Stamp Duty Cliff: London's Commuter Ring and why £1 extra costs first-time buyers £5,000. The control methodology used here was first applied to Welsh Land Transaction Tax bands, which found the same signature at Wales's own £400,000 boundary.
Run your own number through Homecost's stamp duty calculator, or see how stamp duty, mortgage and council tax stack up for a property near one of the commuter-belt postcodes where £500,000 sales concentrate. Browse more Cost Intelligence guides on Homecost.
This is general information about how stamp duty thresholds work, not advice on when to buy or sell, or how to price a property. Speak to a qualified conveyancer or tax adviser before acting on any stamp duty calculation.