Quick answer: Stamp duty for England & NI, band by band. £350,000 costs £7,500 standard, £2,500 as a first-time buyer — and £25,000 with the additional-property surcharge.
SDLT computed the way HMRC does it — band by band, shown line by line. A £350,000 home costs £7,500 for a standard buyer, £2,500 with first-time buyer relief, and £25,000 as an additional property once the 5% surcharge lands. The calculator shows each band's contribution and the effective rate, flags the trap where first-time relief vanishes entirely above £500,000, and says plainly that Scotland and Wales tax property differently.
Marginally, like income tax: nothing on the first £125,000, 2% to £250,000, 5% to £925,000, 10% to £1.5m and 12% above. Only the slice inside each band pays that band's rate — a £350,000 purchase pays £2,500 on its second slice and £5,000 on its third, never 5% of everything.
Nothing up to £300,000 and 5% on the portion to £500,000 — so £2,500 on a £350,000 first home instead of £7,500. The cliff: pay over £500,000 and the relief disappears completely, standard bands apply to the whole price. At £501,000 you owe about £15,050 — a £1,000 price rise costing over £12,500 in tax.
Buying a second home or buy-to-let adds 5% of the entire price on top of normal bands (raised from 3% in late 2024). On £350,000 that is £17,500 of surcharge for £25,000 total. It applies even if the second property is abroad, and refunds exist if you sell your previous main home within three years.
Every calculator runs from one config: your name, your colours, your prices. Brand it below, open any tool from the catalogue, and finish a quote — the lead lands in the table here the moment the estimate unlocks. On your own site the widget works exactly like this.
| Captured | Name | Contact | Tool | Job value |
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| No leads yet — run any tool in the catalogue and finish the quote. | ||||
| Tenants signed | Avg. rent | Monthly | Annual |
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