Separate country pages: Mortgage Calculator · current page is UK · Canadian Mortgage Calculator
UK Mortgage Calculator
Estimate a UK mortgage payment, compare repayment vs interest-only, and add England/Northern Ireland stamp duty to your upfront cost.
SDLT estimate uses England and Northern Ireland residential bands checked for 2026. Scotland and Wales use separate property tax systems.
Edit the property price, deposit, rate, term and monthly costs to compare repayment, interest-only and the estimated upfront SDLT bill.
How this UK mortgage calculator works
The calculator subtracts your deposit from the property price to estimate the mortgage amount. A repayment mortgage uses the standard amortisation formula, so each payment includes interest and a slice of the loan. An interest-only mortgage uses the monthly interest charge only, which keeps the payment lower but leaves the borrowed amount to repay later.
The stamp duty estimate is for residential purchases in England and Northern Ireland. First-time buyer relief is applied only when the property price is within the relief limit. If the home is above that limit, the standard bands are used.
Repayment vs interest-only
A repayment mortgage is the safer default for most buyers because the balance falls every month. Interest-only can help with cash flow, but it needs a credible repayment plan for the end of the term. Lenders may apply stricter checks before approving it.
Estimates only — not financial, mortgage or tax advice.
Frequently asked questions
How does the UK mortgage calculator work?
It subtracts your deposit from the property price, applies the monthly mortgage interest rate across the chosen term, and estimates either a repayment mortgage payment or an interest-only payment.
Does this include UK stamp duty?
Yes. It estimates Stamp Duty Land Tax for England and Northern Ireland using the current standard and first-time buyer bands shown on the page. Scotland and Wales use different systems.
What is the difference between repayment and interest-only?
A repayment mortgage pays interest and gradually clears the loan. An interest-only mortgage pays only the interest each month, so the original loan still needs to be repaid at the end.
Is the deposit the same as a down payment?
Yes. UK buyers normally call it a deposit; US buyers often call it a down payment. In both cases, it is the cash you contribute upfront before borrowing the rest.
Can first-time buyers get stamp duty relief?
Eligible first-time buyers in England and Northern Ireland can pay no SDLT on the first £300,000 when the property price is £500,000 or less. Above that price, standard rates apply.
Are these results mortgage advice?
No. The figures are planning estimates only. Your lender, solicitor or adviser can confirm exact rates, fees, eligibility and tax treatment.