Overpayment calculator

Save money and reduce your mortgage term by overpaying. Use this tool to crunch the numbers

Overpayment calculator

Note. Typically you’re only allowed to overpay by 10% of your outstanding mortgage balance per year, so bear this in mind in particular if you wish to make recurring overpayments more than once a year.

Overpayment calculator FAQ's

Before overpaying

Before overpaying your mortgage, check your lender allows you to do this penalty-free, and if there are any limits on how much you can overpay by.

If you’re on your lender’s standard variable rate, there’s normally no limit. But most fixed-rate mortgages and some tracker mortgages have an annual overpayment limit of 10% of your TOTAL outstanding mortgage balance.

As the exact method of how this 10% is calculated varies by lender, use our calculator as a rough guide. Then speak to your lender to work out exactly how much you can overpay by.

Also ensure that any overpayment you make goes to reduce the debt (so shortening the term) rather than reducing your monthly payments. This calculator assumes you reduce the mortgage debt, which is the main benefit of overpaying.

More calculators

How much can you borrow? What will your monthly repayments be? Use these quick, simple tools to help you do the sums.

Learn how much stamp duty will you pay on your new home by using our calculator

Sign up to our newsletter

Our recommended tools

Search our database to find companies to help you at any stage of your homebuying journey, from mortgage lenders to removal firms.

Need a mortgage? We’ll link you with a mortgage adviser or lender who can fulfil your exact homebuying needs.

What is the best mortgage rate in the UK today? Which remortgage deals have the lowest rates? Check out our best buy table.

Search our database to find companies to help you at any stage of your homebuying journey, from mortgage lenders to removal firms.