Repayments use a standard capital-and-interest mortgage with a fixed illustrative rate. Product fees, changing rates, early repayment charges and lender affordability rules are not included, so the page is a planning estimate rather than a lender quote.
MORTGAGE & HOME BUYING
Mortgage repayment calculator
Estimated monthly repayment
£1,667/month
- Mortgage amount
- £300,000
- Loan-to-value
- 85.7%
- Total interest
- £200,249
- Paid off in
- 25y 0m
- Overpayment saving
- £0
See your monthly payment, total interest and how much regular overpayments could save. This is the core mortgage payment page users compare against affordability, rate-rise, interest-only and overpayment decisions before they move into a property budget.
Repayments use a standard capital-and-interest mortgage with a fixed illustrative rate. Product fees, changing rates, early repayment charges and lender affordability rules are not included, so the page is a planning estimate rather than a lender quote.
On a £350,000 home with a £50,000 deposit, a 25-year repayment mortgage at 4.5% gives a loan of £300,000. At those assumptions, the payment is roughly £1,667 per month before any overpayments. That example is useful for comparison, but actual lender quotes can differ because of fees, incentives, product type, term, credit profile and affordability policy.
- Do not treat a headline rate as the full cost, because fees and term choices can change the monthly payment and total interest.
- Do not assume the same repayment fits every lender, because stress tests, age limits and product rules can all change the answer.
- Do not ignore overpayment allowances and early repayment charges when comparing the value of paying extra.
- Mortgage results can move because of the rate you are offered, the term, lender stress tests, product fees, credit profile and whether overpayments are allowed.
- A headline rate is not a full affordability decision.
How this page is governed
This calculator is reviewed against published mortgage guidance and the page is updated when the core repayment logic or trust notes change. Canonical URL, sources, last reviewed date and FAQ content are kept together so the page remains consistent for users and search engines.
If a lender quote differs, that is expected: lenders test affordability, fees, product rules, term limits and the borrower's full circumstances. Use the result as a planning estimate, not as a lender promise.
SOURCES & REVIEW
Checked against official guidance
Last reviewed 1 September 2026 · Rule version GB-2026.27.1
Daily/weekly source monitoring. If a source changes, the affected rule set is reviewed before publication.
All source links are kept visible so you can verify the figures used on this page.
Source line: Mortgage repayment assumptions are checked against MoneyHelper guidance and the site’s shared mortgage rule set.
MoneyHelper: Mortgage calculator ↗MoneyHelper: Overpaying your mortgage ↗Sources, methodology and update policy →Report an issue or correction →WHY RESULTS DIFFER
Why two users can see different results
Why the result can differ
Different tax codes, payroll periods, Scottish bands, pension methods or lender assumptions can change the outcome.
One-off bonuses, pay frequency, overpayments, allowances and reliefs can move the result away from a simple annual estimate.
Where a rule depends on eligibility or legal status, this page shows an estimate and links to official guidance.
This section is intentionally repeated on key tools so the explanation stays near the result instead of being hidden in a separate policy page.
COMMON QUESTIONS
Frequently asked questions
Does this include fees?
No. Arrangement, valuation, legal and early repayment fees are excluded.
Is this a lender decision?
No. It is an estimate only. Lenders also check income, commitments, credit history, age and property type.
Can overpayments shorten the term?
Yes, if your lender allows them and any early repayment charges do not outweigh the benefit.
Is this an interest-only mortgage?
No. This page models a repayment mortgage where capital and interest are both paid each month.
Why can the payment change even if the balance stays the same?
Because the rate and term affect the amortisation formula, and even a small rate move changes the monthly payment.
Should I use affordability first or repayment first?
If you know the property price, start with repayment. If you need the borrowing limit, use affordability first.