PilotRate

UK Mortgage Calculator

Adjust the values below to calculate your estimated UK mortgage payments, including Stamp Duty Land Tax.

Loan Details

£
£50,000£5,000,000
£
£0£650,000
%
0.5%15%
yrs
5 yrs40 yrs

Stamp Duty Land Tax

£22,500SDLT due

Current SDLT rates (standard):

Up to £250,0000%
£250,001 – £925,0005%
£925,001 – £1,500,00010%
Above £1,500,00012%

Amortization Schedule

Over 25 years
Remaining Balance
Interest Paid
Principal Paid

Insights

Even a 0.25% rate reduction can save approximately £22,449 over a 25-year term. Shopping around for the best mortgage deal is essential.
Making overpayments of up to 10% of your outstanding balance each year can significantly reduce your term without Early Repayment Charges.
Consider a 5-year fixed rate for payment stability, or a tracker rate if you expect base rates to fall.

These are educational estimates only and do not constitute financial advice.

Your Estimate

Monthly Payment

£3,007

Principal + Interest

Total Interest

£381,991

Total Mortgage Cost

£901,991

Estimated Payoff

August 2051

Stamp Duty

£22,500

Principal (58%)Interest (42%)

PilotRate provides educational mortgage estimates and does not constitute financial advice.

UK Mortgage Calculator — Frequently Asked Questions

How is stamp duty calculated in the UK?
Stamp duty land tax (SDLT) applies to property purchases in England and Northern Ireland. As of April 2025, the nil-rate band is £250,000 for standard buyers. Rates range from 0% to 12% depending on the purchase price, with an additional 2% surcharge for second homes and buy-to-let properties. Scotland and Wales have their own land transaction tax systems.
How do UK mortgage stress tests work?
UK lenders typically stress test your mortgage at the BoE base rate plus 3% or a minimum floor rate, whichever is higher. This ensures you can afford payments if interest rates rise. Lenders also use income multiples — typically 4 to 4.5 times your annual income for joint applications. Our calculator applies these stress tests automatically.
What is the difference between repayment and interest-only mortgages in the UK?
A repayment mortgage pays off both interest and principal each month, so the loan is fully repaid by the end of the term. An interest-only mortgage only covers the interest each month, meaning the full loan amount is still owed at the end. Interest-only mortgages require a credible repayment plan and are harder to qualify for.
What is a mortgage term and how long should it be?
A mortgage term is the total length of your mortgage, typically 25 to 35 years in the UK. Longer terms mean lower monthly payments but more total interest paid. Shorter terms build equity faster. Some lenders now offer terms up to 40 years, though these are less common and may have higher rates.
What is the Bank of England base rate and how does it affect my mortgage?
The Bank of England base rate is the UK's central bank interest rate. It directly affects tracker mortgages, which follow base rate plus a margin, and influences fixed-rate pricing. When the base rate rises, variable-rate and tracker mortgage payments increase. When it falls, they decrease. Our calculator helps you model different rate scenarios.