Mortgage tools
See How Overpaying Could Shorten Your Mortgage
Enter your balance, rate, and an extra monthly or lump-sum payment to see how the term and interest might change. An illustration, not a recommendation to overpay.
Your Mortgage Details
Adjust the values below to see how extra payments could reduce your mortgage term and total interest.
On top of your contractual monthly payment.
Applied once at the start. Optional.
Weezz shows information and estimates from your figures, not financial advice.
Your Total Savings
Waiting for Inputs
£ —
By overpaying, you could save this much in interest over your mortgage.
Remaining Balance
Enter your details to see your estimated remaining balance over time.
Your Path to Home Ownership
We will calculate your overpayment savings once you enter your details.
Understanding mortgage overpayments
Extra payments can cut the term and the interest you pay. Most lenders allow overpayments of up to 10% of your balance per year without penalties.
How overpayments work
Extra payments reduce the outstanding balance. Later interest is charged on a smaller amount. Small regular overpayments can still change the end date.
Early repayment charges
Most fixed-rate mortgages limit penalty-free overpayments to 10% of the outstanding balance per year. Going over that can mean early repayment charges, often 1–5% of the excess. Check your terms before you overpay. This page does not include those charges.
This calculator assumes capital-and-interest repayment only, with monthly compounding and payment at month end. Early repayment charges are not included. This does not recommend overpaying.
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Sign upCommon questions
How does the overpayment calculator work?
You enter balance, rate, remaining term, and an extra monthly or lump-sum payment. Weezz shows how the schedule shortens and how much interest you might avoid. It is an illustration, not a recommendation to overpay. Weezz shows information and estimates from your figures, not financial advice.
Will my lender allow overpayments?
Many England repayment mortgages allow about 10% of the balance each year without an early repayment charge, but products differ. Check your offer letter before you send money. Weezz does not know your product rules.
Should I overpay my mortgage?
Weezz does not recommend overpaying. Compare interest saved with other uses of the cash, including an emergency fund. Weezz shows information and estimates from your figures, not financial advice.