A first-time buyer purchasing the 2025 median home in County Durham or Blackpool pays no stamp duty at all — the equivalent of zero years of council tax, whatever band their home sits in. A buyer purchasing an additional property at those same two medians pays enough stamp duty to cover between 1.4 and 4.4 years of council tax, depending on the band. Same postcode, same price, same council tax bill — a completely different stamp duty outcome, because the two buyer categories are taxed by structurally different rules.
This builds on an earlier piece that converted a standard mover's stamp duty bill into years of council tax across Band A to Band H (Stamp Duty in Years of Council Tax: Band A vs Band H). Applying the same five-council sample — Kensington and Chelsea, Windsor and Maidenhead, Dorset, County Durham and Blackpool — to first-time buyers and additional-property buyers shows the band effect behaves very differently depending on who's buying.
First-time buyer relief: years saved, or nothing at all
First-time buyer relief removes stamp duty entirely up to £300,000, then charges 5% on the slice between £300,000 and £500,000 — but the relief stops applying altogether above £500,000 (HMRC, 2026). That cliff edge means it makes no difference at all to a buyer at the Windsor and Maidenhead or Kensington and Chelsea medians, both comfortably above the £500,000 ceiling.
| Council | 2025 median price | Mover SDLT | First-time buyer SDLT | Band D years "saved" |
|---|---|---|---|---|
| Kensington and Chelsea | £1,190,000 | £62,750 | £62,750 | 0.00 |
| Windsor and Maidenhead | £545,000 | £17,250 | £17,250 | 0.00 |
| Dorset | £345,000 | £7,250 | £2,250 | 1.81 |
| County Durham | £146,500 | £430 | £0 | 0.16 |
| Blackpool | £137,000 | £240 | £0 | 0.10 |
At the Dorset median, first-time buyer status turns a £7,250 mover's bill into £2,250 — a saving equivalent to 1.81 years of that home's Band D council tax (£2,765.02). In County Durham and Blackpool, the mover's bill was already small enough (£430 and £240) that the "saving" is under two months of council tax either way. At the two priciest medians in this sample, the relief is worth precisely nothing on the stamp duty line, because both sit above the £500,000 ceiling where the relief withdraws completely rather than tapering.
The additional-property surcharge never hits that cliff
The additional-property surcharge works differently: a flat 5% is added on top of the standard rate from the very first pound, with no lower threshold and no upper ceiling (HMRC, 2026). Converted into years of council tax by band, it produces a multi-year figure at every price point in this sample — including the two councils where first-time buyer relief reduced the bill to zero.
| Council | Band A years | Band D years | Band H years |
|---|---|---|---|
| Kensington and Chelsea | 110.03 | 73.35 | 36.68 |
| Windsor and Maidenhead | 34.18 | 22.79 | 11.39 |
| Dorset | 13.29 | 8.86 | 4.43 |
| County Durham | 4.44 | 2.96 | 1.48 |
| Blackpool | 4.23 | 2.82 | 1.41 |
Within any single council, Band A takes roughly three times as long to "pay back" the surcharge as Band H, because Band H's annual bill is exactly three times Band A's under the statutory 6/9 to 18/9 multiplier scale (Local Government Finance Act 1992, s.5). But across councils, the additional-property figure never falls to zero the way the first-time buyer figure does — a buyer taking on an additional property in Blackpool is still looking at 1.4 to 4.2 years of council tax in stamp duty alone, at exactly the price point where a first-time buyer pays nothing.
Why the two lines move in opposite directions
The mechanism is structural, not incidental. First-time buyer relief is a bounded exemption: a nil-rate band up to £300,000, a discounted band to £500,000, then a hard stop. Below the stop it can wipe out a bill completely; above it, it does nothing. The additional-property surcharge is an unbounded flat-rate add-on: 5% of the full price, layered on the standard progressive bands, with no price below which it doesn't apply. One relief is capped and disappears at scale; one surcharge has no cap and never disappears. Expressing both in years of a home's own council tax band makes that structural difference visible in a way the raw cash figures don't — a companion piece walks through the equivalent comparison for additional-property buyers using the national 295-council ladder (Additional-Property Stamp Duty in Years of Council Tax), and the first-time buyer figures above are the band-by-band extension of a national first-time buyer analysis published separately (First-Time Buyers: Stamp Duty in Years of Council Tax).
Figures here are drawn from 799,137 category-A residential sales completed across England and Wales during 2025 (HM Land Registry Price Paid Data), the 296 English billing authorities' 2026-27 Band D council tax figures (gov.uk), and Homecost's stamp duty calculator, checked on 2026-09-16. See more Cost Intelligence coverage.
Try it on your own numbers
The stamp duty calculator applies first-time buyer relief and the additional-property surcharge to any price: try the stamp duty calculator pre-filled for a first-time buyer at the Dorset median, or the same calculator with the additional-property surcharge applied. For a full council tax and mortgage cost breakdown by postcode, see Kensington and Chelsea's SW5 9LH true cost page or Blackpool's FY2 0ED true cost page.
This is general information about how stamp duty and council tax rules work, not advice on your own purchase. Speak to a qualified adviser before acting.