Stamp Duty Calculator

Use our free stamp duty calculator to work out exactly how much Stamp Duty Land Tax (SDLT) you’ll pay when buying a house or flat in England or Northern Ireland. Whether you’re a first-time buyer claiming stamp duty relief, a home mover buying your next main residence, or an investor purchasing a buy-to-let or second home at the higher additional-property rates, simply enter your purchase price and buyer type for an instant, band-by-band breakdown of your stamp duty bill and the effective rate you’ll pay.

Stamp duty is usually the largest upfront cost of moving home after your deposit, so knowing your SDLT liability early makes budgeting far easier. The calculator uses the current HMRC stamp duty rates and thresholds (last reviewed April 2025), including first-time buyer relief, the additional-property surcharge and the non-UK resident surcharge. As independent estate agents in Banstead and Cheam, Williams Harlow helps buyers and sellers across Surrey and south-west London plan every cost of their move — if you’re thinking of selling, book a free property valuation with our local team.