Calculate UK mortgage repayments including Stamp Duty Land Tax, deposit requirements, and Help to Buy options. Get accurate monthly payment estimates.
Last updated: 1 November 2025
This calculator uses the standard amortization formula to calculate monthly mortgage payments. It takes into account the loan principal, interest rate, loan term, and country-specific costs to provide accurate payment estimates.
Follow these steps to get accurate mortgage calculations:
The calculator uses the standard amortization formula to compute your monthly payment:
The formula calculates your fixed monthly payment that covers both principal and interest over the loan term.
M = P × [r(1+r)^n] / [(1+r)^n - 1]For most countries, the monthly rate is simply the annual rate divided by 12.
Your complete monthly repayment includes several components:
The total amount you pay each month consists of multiple parts that vary by country:
The base payment that pays down your loan and covers interest charges.
UK mortgages involve stamp duty, Help to Buy schemes, and different terminology like 'deposit' instead of 'down payment'.
UK mortgages have short fixed-rate terms (2-7 years) then remortgage. First-time buyers can access 5% deposits via government guarantee. Stamp duty, council rates, and leasehold costs (if applicable) significantly impact total ownership costs.
UK mortgages typically have initial fixed rates of 2-7 years, then you renew or remortgage to current rates.
UK offers flexible deposit options with government guarantee scheme for first-time buyers at 5% deposit.
Bank of England removed stress test in March 2025; lenders now use income multiples for assessment.
One-time property transfer tax paid at completion - rates vary by property value and buyer status.
Required by mortgage lenders before completion - covers property structure, not contents.
Annual property tax based on council tax bands (A-H) - separate from income tax and mortgage.
About 20% of UK properties are leasehold (common in flats) - budget for additional costs.
LTV significantly impacts interest rates - lower LTV means better rates.
Term length impacts monthly payment and total interest - 25 years is most common.
Most UK mortgages allow overpayments of up to 10% of balance annually without penalty.
The calculator provides several important metrics to help you make informed decisions:
Understanding the breakdown of your monthly and total costs helps you plan your budget and compare loan options.
Key ratios and schedules that help you understand your mortgage structure and payment progression.
The percentage of the home value you're borrowing. Lower LTV typically means better rates.
A month-by-month breakdown showing how each payment is allocated.
Monthly mortgage payment is calculated using the standard amortization formula: M = P × [r(1+r)^n] / [(1+r)^n - 1], where P is the principal loan amount, r is the monthly interest rate, and n is the total number of payments. This covers principal and interest only.