Calculate UK Stamp Duty Land Tax (SDLT) for England and Northern Ireland property purchases. Returns total tax due, effective tax rate, and a breakdown by band. Includes first-time buyer relief (nil rate up to £425,000 on properties up to £625,000) and additional property surcharge (+5% for buy-to-let and second homes) at 2025/26 rates. Use this tool when a user asks about stamp duty, SDLT, property purchase tax, or how much tax they'll pay on a house purchase. For full property due diligence including EPC, flood risk, and planning constraints, use uk_property_intelligence instead. Source: HMRC SDLT Rates.
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