UK mortgage calculators
Remortgage Break-Even Calculator
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What this result means
A lower headline rate is not automatically a saving. Arrangement, valuation, legal, exit and early repayment charges must be recovered before a switch becomes beneficial.
How to use the calculator well
- Use the balance expected on the completion date.
- Add every unavoidable switching cost, including fees added to the new loan.
- Compare over the period you expect to keep the deal, not the full mortgage term by default.
Worked scenario
Reducing a £200,000 mortgage from 6% to 4.5% can lower the modelled monthly repayment, but a £999 fee delays the break-even point. An early repayment charge or a short intended holding period could reverse the conclusion.
Questions people ask
What is break-even?
It is the estimated time for cumulative monthly savings to recover the switching costs entered.
Are fees added to the loan free?
No. A fee added to the mortgage normally attracts interest, potentially for the remaining term.
Sources and review standard
Calculations are independently implemented illustrations and were reviewed on 4 September 2026. We check factual boundaries against MoneyHelper's mortgage cost guidance, FCA consumer mortgage information and relevant lender documentation. Rates and product terms are never presented as live offers.
Before relying on this estimate
This is an educational illustration, not mortgage, financial, tax or legal advice, a lender decision or an offer. Exact rates, fees, early-repayment charges and product rules can materially change the result.
Check the figures with your lender, broker or qualified adviser. Your home may be repossessed if you do not keep up repayments on your mortgage.
Editorial responsibility
Published by Acerville Sparks Limited. Software assists research, drafting and automated formula testing. Primary sources, assumptions and limitations are shown so readers can inspect the work. No independent mortgage professional or financial adviser review is claimed. Reviewed 4 September 2026.