Stamp Duty Calculator Calculate how much Stamp Duty you’ll have to pay. Property Purchase Price £ Are you a first-time buyer? Is this a buy-to-let or second home? Is this replacing your main residence? Are any of the purchasers non-UK resident? This calculator is provided as a guide only on how much stamp duty land tax you will need to pay in England and Northern Ireland. It assumes that the property is freehold and for residential purposes.