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Mortgages Finder provides general information, calculators and adviser callback options. The website content is not personalised mortgage advice.

Are calculator results guaranteed?

No. Calculator outputs are estimates only. Actual mortgage availability, rates, costs and repayments depend on lender criteria and your circumstances.

Can this page guarantee a mortgage approval?

No. Mortgage approval is never guaranteed and depends on lender assessment, affordability, credit history, property details and other checks.

Mortgage Overpayment Calculator UK

See the years and interest a regular overpayment could save you.

Mortgage Overpayment Calculator

See how monthly overpayments could shorten your term and reduce interest.

Outstanding balance (£) Remaining term (years) Interest rate (%) Monthly overpayment (£)

Years saved

— years

Interest saved

£—

New payoff

— mo

Most lenders allow ~10%/year overpayment without ERC. Check your mortgage terms before overpaying large amounts.

Speak to an adviser about overpaying or remortgaging.

Get a personalised quote

No credit check. No obligation.

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How overpayments work

An overpayment pays down extra principal, so all subsequent months charge interest on a smaller balance. The compounding effect means even a modest monthly overpayment can shave years off the term.

Before you overpay

Check your lender’s annual overpayment allowance during the fixed period.
Keep an emergency buffer in instant-access savings.
Compare with high-rate savings / employer pension matching.
Ask the lender to apply overpayments to “reduce term” for maximum saving.

Frequently asked questions

How much can I overpay without a charge? +

Most UK lenders allow up to 10% of the outstanding balance per calendar year without triggering an Early Repayment Charge during a fixed deal. Always check your mortgage offer.

Is overpaying always worth it? +

It often saves significant interest and can shorten the term substantially. But you should keep an emergency cash buffer and consider whether savings or pension contributions might be better depending on rates.

Reduce term or reduce monthly payment? +

Most lenders default to keeping the term the same and shrinking the next monthly payment slightly. To reduce term, ask the lender to apply overpayments to “reduce term” rather than “reduce balance”.

What about when my fixed deal ends? +

Outside the fixed period most lenders allow unlimited overpayment with no ERC. Many borrowers ramp up overpayments at that point.

Browse mortgage calculators Compare repayment, borrowing and stamp duty estimates. Check your borrowing estimate Estimate a possible borrowing range from income and deposit assumptions. Estimate monthly repayments Model repayments using your own rate, term and deposit assumptions.

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Mortgages Finder focuses on matching your circumstances with a UK mortgage adviser partner. Calculator results and guides are starting points only; any product discussion depends on your full circumstances and lender criteria.