Mortgage overpayment calculator

What options are available?

Restrictions may apply. Overpayments may incur an Early Repayment Charge (ERC).

Regular overpayment

This is a regular payment you make every month on top of your monthly mortgage repayment.

These payments will reduce the amount you owe us and could help you pay less interest over the term of the mortgage.

  • You must continue to make your normal mortgage payment in full each calendar month.
  • Monthly overpayments will reduce your mortgage balance and could help save you interest.
  • You can make overpayments of up to 10% of your usual monthly payment without penalty.
  • If you exceed your allowance, you’ll have to pay an Early Repayment Charge on the amount over 10%.
  • If you’re on our Standard Variable Rate or base rate tracker mortgage, you can overpay as much as you like without an early repayment charge.

Lump-sum overpayment

These are additional payments that you can make that are not linked to your monthly repayments.

These payments will reduce the balance of your mortgage, which could help you pay less each month or repay your mortgage early.

  • For a fixed rate mortgage, the minimum lump-sum overpayment is £1,000. You can make up to 2 overpayments in a 12-month period.
  • If you’re on our Standard Variable Rate or base rate tracker mortgage, you can overpay as much as you like without an early repayment charge.
  • After your lump-sum payment has been made, your monthly payment will be recalculated.
  • If you want to pay off your mortgage, you’ll need to request a redemption statement.
  • Overpayments may incur early repayment charges.

Mortgage overpayment calculator

Want to make an overpayment and understand how this could impact your mortgage payments and interest? Pop your details into our simple overpayment calculator and we’ll show you just that.

* This information is required. 

Select an option to see how you could save:

A lump-sum overpayment can lower your monthly repayments.
Paying a lump-sum is a way to lower your monthly payments.
Please enter your mortgage balance

Time Remaining (Years, Months)*

Please enter current interest rate on your mortgage
Please enter extra monthly payments


Please enter lump sum payment
Calculations based on interest accruing daily and applied monthly.
Your current monthly repayment is

Amount saved each month
Your current monthly repayment is


Important information

If you're not on our Standard Variable Rate (which has no restrictions on the amount you can overpay), there may be a maximum value amount you can overpay each year without incurring an Early Repayment Charge. For more information please refer to your most recent mortgage offer.

To illustrate savings, we have made the following assumptions:

  • The amount you currently pay is based on either your previous monthly payment or the information you have entered.
  • Monthly overpayments are made and remain constant throughout the mortgage term.
  • The interest rate will remain the same for the term of the mortgage.
  • Months are of 12 equal lengths, so the monthly interest will not differ.
  • Repayment amounts are rounded up or down accordingly to the nearest £1 for display purposes.
  • The potential reduction in time to repay your mortgage is presented as years/months. The figure is rounded up or down accordingly for display purposes.

The calculator is for illustrative purposes only. It does not provide a precise calculation of the time or interest you could save, but is intended to give you information and guidance about the potential savings. Please note the calculator does not factor in any charges for early repayments of the total mortgage balance and is based on a capital repayment mortgage. This overpayment calculator does not include all of the information that you need to select or compare mortgages. Please request a Mortgage Illustration before you choose a mortgage.

Common questions

Contact us about mortgages

You can contact our mortgage teams by calling us, completing a callback form or using our online forms to request:

  • mortgage statements
  • mortgage tax certificates
  • mortgage redemption quotes.