Santander — Free UK Tool
Santander Mortgage Overpayment
Calculator
Find out exactly how much interest you save and how many years you cut off your Santander mortgage — including Santander's specific overpayment rules and annual limits.
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Santander Mortgage Overpayment Rules
How much can I overpay on my Santander mortgage?
Santander allows most customers to overpay up to 10% of their outstanding mortgage balance per year without incurring early repayment charges. For example, on a £190,000 Santander mortgage, you could overpay up to £19,000 in a year penalty-free. Santander tracker and follow-on rate mortgage customers can typically overpay by any amount without restriction.
How do I make an overpayment on my Santander mortgage?
Making a Santander mortgage overpayment is straightforward. Log in to Santander's online banking or mobile app and transfer additional funds to your mortgage account. You can also call Santander's mortgage team on 0800 917 5630, visit a branch, or set up a standing order from your Santander current account to overpay a fixed amount each month automatically.
Will Santander reduce my monthly payment or my term when I overpay?
Santander's default approach is to reduce your monthly payment when you overpay, keeping your original mortgage term the same. While this gives you short-term cash flow relief, it saves less money overall compared to shortening your term. If you want to reduce your term instead — which is more financially beneficial — you need to contact Santander specifically and request this option.
What is Santander's early repayment charge?
If you overpay more than 10% of your outstanding balance in a year on a Santander fixed-rate mortgage, you will be subject to an early repayment charge (ERC). ERCs with Santander are typically calculated as a percentage of the excess overpayment amount. The exact percentage depends on your specific mortgage deal and how early you are in your fixed-rate period — generally ranging from 1% to 5%.
Can I check my Santander overpayment limit online?
Yes. You can check your remaining annual overpayment allowance by logging into Santander's online banking or mobile app, where your mortgage details including your current balance and available overpayment limit are displayed. You can also call Santander to confirm before making any significant overpayment.
Also try our other calculators
We have dedicated overpayment calculators for all major UK lenders. Try our general mortgage overpayment calculator, Nationwide overpayment calculator, NatWest overpayment calculator, Halifax overpayment calculator, HSBC overpayment calculator, or Barclays overpayment calculator.