MortgageOverpays
For Santander mortgage customers

Santander mortgage overpayment calculator

See exactly how many years and how much interest you'd save by overpaying your Santander mortgage — modelled with their typical 10% annual allowance.

Your mortgage

UK calculator
Estimated monthly payment£1,254
Your overpayment result

You'll be mortgage-free 6 years 9 months earlier
and save £46,940 in interest.

New payoff
September 2044
was June 2051
Total interest
£109,338
was £156,277

Balance over time

Without overpaying With overpaying
WithoutWith overpay
Term25 years18 years 3 months
Total interest£156,277£109,338
You save£46,940 · 6y 9m

Want to clear it even faster?

A lower interest rate could save you thousands more on top. See if you could remortgage to a better deal.

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Overpaying your Santander mortgage

Santander UK has hundreds of thousands of mortgage customers, and their overpayment policy is one of the more flexible on the high street. This calculator shows exactly how much interest you'd save and how many years you'd knock off your Santander mortgage by overpaying within their allowance.

What to know about Santander overpayments

  • Santander typically allows up to 10% of the outstanding balance per year in overpayments without early repayment charges during a fixed or tracker deal.
  • Overpayments via the Santander app and Online Banking are usually credited instantly, so interest savings begin straight away.
  • Santander applies overpayments to reduce your mortgage term by default, keeping your monthly payment the same — this is what generates the largest savings.
  • Early repayment charges on Santander fixes typically taper from around 5% in year one down to 1% in the final year of the deal.

These are general guidelines — the exact allowance and any early repayment charges depend on your specific Santander mortgage product. Always check your mortgage offer or contact Santander before making a large overpayment.

Santander overpayment FAQs

Common questions from Santander mortgage customers.

Embed this calculator on your site

Free to use on any website — blog post, finance guide, comparison page. Paste this snippet into your HTML and the Santander overpayment calculator will appear.

<iframe
  src="https://mortgageoverpays.com/embed/overpayment-calculator/santander"
  title="Santander Mortgage Overpayment Calculator"
  width="100%"
  height="1100"
  style="border:0;max-width:880px;width:100%"
  loading="lazy"
  referrerpolicy="no-referrer-when-downgrade"
></iframe>

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