Planning to buy a home? Work out the two numbers that matter most — your monthly mortgage payment and your Stamp Duty — with our free UK calculator.
Open the Mortgage & Stamp Duty Calculator
Enter the house price, your deposit, the interest rate and the term to see your estimated monthly repayment, total interest and loan-to-value. Then switch to the Stamp Duty tab to see your SDLT bill band by band — standard rates, first-time buyer relief (no tax on the first £300,000 on homes up to £500,000), and the higher rates for an additional property. The rates are the ones in force since 1 April 2025 for England and Northern Ireland.
It is completely free, there is no sign-up, and nothing you type leaves your browser.
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