UK Mortgage Calculator — Work Out Your Monthly Repayments
Free UK mortgage calculator. Calculate monthly repayments and estimated Stamp Duty (SDLT) for any residential or buy-to-let mortgage in England or Northern Ireland.
- Loan Amount£280,000 · 54%
- Total Interest£235,833.49 · 46%
Over 25 years you'll pay back £515,833.49 on a £280,000 loan — interest alone adds 84%.
- Estimated Stamp Duty (SDLT)£5,000
- Loan (Mortgage) Amount£280,000
Standard England/NI residential SDLT bands shown — first-time buyer relief, Scotland (LBTT) and Wales (LTT) use different bands.
About the UK Mortgage Calculator
A UK mortgage quote hides a second, often-overlooked cost — Stamp Duty Land Tax, charged in bands against the purchase price, which can add tens of thousands of pounds on top of your deposit and doesn't show up anywhere in a lender's headline repayment figure. This calculator works out both halves together: your monthly repayment on the mortgage itself, and an estimate of the SDLT due on completion, using the standard England/Northern Ireland residential bands.
It's built for UK home buyers sizing up a purchase — working out what a specific property actually costs to buy and repay before making an offer or speaking to a mortgage broker.
Deposit size, the property price you're actually considering — the kind of numbers people would rather test privately before a mortgage broker's affordability tool logs an enquiry. This calculator runs entirely in your browser.
How it’s calculated
SDLT is charged in bands, not as a flat percentage of the full price — the portion of the price in each band is taxed at that band's own rate, similar to how income tax bands work, which is why the effective rate on the whole purchase is always lower than the top band's rate. The mortgage repayment itself uses the standard amortization formula applied to the loan amount (purchase price minus deposit) over the chosen term.
Frequently asked questions
Do first-time buyers pay less Stamp Duty in the UK?
Yes — first-time buyer relief typically raises the nil-rate threshold, meaning first-time buyers pay no SDLT on a larger initial portion of the price than this calculator's standard bands assume. This calculator shows the standard residential bands; check current first-time buyer relief separately if it applies to you.
Is Stamp Duty different in Scotland and Wales?
Yes — Scotland charges Land and Buildings Transaction Tax (LBTT) and Wales charges Land Transaction Tax (LTT), both with their own separate bands and rates from the England/Northern Ireland SDLT bands shown here.
What's the difference between a fixed-rate and tracker mortgage in the UK?
A fixed-rate mortgage locks your interest rate for an agreed period, typically 2-5 years, so your payment doesn't change even if the Bank of England base rate moves. A tracker mortgage moves directly with that base rate plus a set margin, so your payment can rise or fall over the same period.
How much deposit do I need for a UK mortgage?
5% is the typical minimum for many mainstream lenders, though the best rates are usually reserved for deposits of 25% or more — a larger deposit lowers your loan-to-value ratio, which directly improves the rates you'll be offered.
Does this include the additional-property Stamp Duty surcharge?
No — this calculator applies standard residential bands only. Buy-to-let purchases and second homes typically carry an additional SDLT surcharge on top of the standard bands, which isn't reflected in this estimate.
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