Finance calculator
United KingdomUK Mortgage Repayment Calculator
Estimate UK mortgage repayments with deposit, term years and months, monthly overpayment, total interest, payoff date, repayment schedule, and optional council tax, buildings insurance, service charge, or mortgage fees.
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Estimate UK mortgage repayments with deposit and overpayment scenarios
UK searches usually ask for a mortgage repayment calculator, deposit, overpayment, years and months, and repayment schedule. This page is built around repayment-mortgage language rather than US escrow or PMI wording.
Enter the property price or mortgage amount, deposit, interest rate, term, optional council tax or local cost, buildings insurance, mortgage fees, service charge, and monthly overpayment. The result shows repayment plus costs, total interest, payoff date, and balance after five years.
The schedule includes annual and monthly amortization tables plus charts showing how principal and interest shift over time. Overpayment scenarios update the payoff date and estimated interest savings.
Stamp Duty Land Tax, product fees rolled into the loan, early repayment charges, and lender affordability checks remain separate decisions.
Before using the result
- Use repayment mortgage assumptions, not interest-only assumptions.
- Keep product fees separate unless you intentionally add them as a monthly planning cost.
- Check overpayment limits before relying on interest-savings estimates.
- Use a lender illustration for final decisions.
FormulaPayment = P x r x (1 + r)^n / ((1 + r)^n - 1)
Formula
Repayment mortgage formula
This UK mortgage repayment result is an estimate. Check lender illustrations, product fees, overpayment rules, and early repayment charges before making decisions.
Payment = P x r x (1 + r)^n / ((1 + r)^n - 1)
For a GBP 300,000 repayment mortgage at 5% over 25 years, n is 300 monthly payments.
SourcesThis calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
Sources and assumptions
Source notes
This calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
- Effective year
- Current rules
- Last verified
- 2026-06-18
This UK mortgage repayment result is an estimate. Check lender illustrations, product fees, overpayment rules, and early repayment charges before making decisions.
Official and reference sources
Assumptions
- The mortgage is modeled as a repayment mortgage with equal monthly principal-and-interest payments.
- Deposit reduces the mortgage amount when a property price is entered.
- Monthly overpayment is applied to principal after scheduled interest.
- Council tax, buildings insurance, service charge, and fees are optional planning costs, not lender approval checks.
Not included
- Stamp Duty Land Tax, affordability rules, product fees rolled into the loan, early repayment charges, remortgage fees, and lender underwriting.
- Interest-only mortgages, tracker-rate changes, and official lender illustrations.
FAQ8 common questions for this calculator.
FAQs
What does the UK mortgage repayment calculator show?+
It estimates monthly repayment, total interest, total principal-and-interest payments, payoff date, and a monthly or annual repayment schedule.
Can I model UK mortgage overpayments?+
Yes. Enter a monthly overpayment to see how it may reduce interest and shorten the repayment schedule.
Does this include UK stamp duty?+
No. Stamp Duty Land Tax or devolved property taxes are not included in the repayment calculation and should be checked separately.
Is this for repayment or interest-only mortgages?+
This page models repayment mortgages. Interest-only mortgage scenarios need a separate calculator because principal is not repaid monthly in the same way.
How does the UK Mortgage Repayment Calculator calculate the result?+
For the UK Mortgage Repayment Calculator, it uses the Repayment mortgage formula: Payment = P x r x (1 + r)^n / ((1 + r)^n - 1). For a GBP 300,000 repayment mortgage at 5% over 25 years, n is 300 monthly payments.
What information do I need to use the UK Mortgage Repayment Calculator?+
Enter the money values, rates, dates, quantities, or assumptions requested by the form. Keep every amount in the same currency or business period before comparing the UK Mortgage Repayment Calculator result.
How accurate is the UK Mortgage Repayment Calculator?+
UK Mortgage Repayment Calculator is accurate for the rates, amounts, dates, and rules entered. It uses the Repayment mortgage formula shown on this page. Real products can differ because of fees, taxes, contract terms, or changing official thresholds.
What should I check before using the UK Mortgage Repayment Calculator result?+
For the UK Mortgage Repayment Calculator, check the entered amounts, rates, dates, and rules, then compare the Repayment mortgage formula and worked example with the contract or source you will rely on. Fees, tax year, currency, and payment timing can change the final decision.
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Finance guide
How to use the UK Mortgage Repayment Calculator
Estimate UK mortgage repayments with deposit, term years and months, monthly overpayment, total interest, payoff date, repayment schedule, and optional council tax, buildings insurance, service charge, or mortgage fees. The page also explains the repayment mortgage formula and shows a practical example: For a GBP 300,000 repayment mortgage at 5% over 25 years, n is 300 monthly payments.
- 1
Enter your details
Enter deposit, term years and months, monthly overpayment, total interest, payoff date, repayment schedule, and optional council tax, buildings insurance, service charge, or mortgage fees, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the repayment mortgage formula: Payment = P x r x (1 + r)^n / ((1 + r)^n - 1).
- 3
Compare scenarios
Change one or more inputs to see how they affect the UK Mortgage Repayment Calculator result before you use the estimate.