Stamp Duty cALCULATOR Stamp Duty is a government tax payable when buying a property over £125,000. Property Purchase Price Is this a buy-to-let or second home? Are you a first-time buyer? Your calculation Stamp Duty Due: Band Rate Amount Total Up to Please note: 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.