New online service – You can now open new savings accounts and view your branch account and mortgage via our online service.

Mortgage overpayment calculator.

See the difference an overpayment could make.

Mortgage overpayment calculator.

Calculating a mortgage overpayment.

Using our calculator you will be able to see how adding a lump sum overpayment, also known as a capital repayment, could affect your mortgage repayments. Instead of reducing your remaining monthly repayments, you may have the option of shortening your mortgage term, depending on the amount you wish to repay and the terms of your mortgage.






Monthly repayment £XX

Total interest repaid over full mortgage term £XX

Total amount repaid over full mortgage term (loan + interest) £XX

Please note: The results are for illustration purposes only.

This mortgage overpayment calculator should only be used as an indicative tool. Fees and charges may apply for making overpayments to your mortgage. Speak to your mortgage lender for full details.

Suffolk Building Society mortgages

Existing mortgage borrower?


We have conversations, not algorithms.

Our decisions are made by experts, not computers. We need to calculate the financials, but we understand there’s more behind a mortgage than then numbers on a page. We can’t promise to lend to everyone and anyone, but we’ll consider all applications on an individual basis.

Ready to go? We’d love to hear from you. Get in touch with our friendly and knowledgeable team.

Prefer to talk?
Call 0330 123 0723

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