How Much Can You Overpay on Your Santander Mortgage?
This guide is for general information only and does not provide financial advice. Check your lender’s terms before overpaying, as early repayment charges may apply. Your home may be repossessed if you do not keep up repayments on your mortgage.
Santander says you can overpay up to 10% of any fixed rate loan each calendar year (January to December) without an early repayment charge, that an unused allowance cannot be carried into later years, and that above 10% you would pay a charge on the amount over 10%. For a mortgage that is not on a fixed rate it says you can make unlimited overpayments without a charge.
Lender terms change, and your own mortgage offer is what applies to you. This page was checked on 30 September 2026 against Santander’s own page, linked below.
This page reports what Santander publishes on its own site. It is general information, not advice and not a statement of your own mortgage terms. See our editorial policy for how we source and re-check lender facts.
What Santander says about the yearly allowance
Santander says you can overpay up to 10% of any fixed rate loan each calendar year (January to December) without an early repayment charge, that an unused allowance cannot be carried into later years, and that above 10% you would pay a charge on the amount over 10%. For a mortgage that is not on a fixed rate it says you can make unlimited overpayments without a charge.
Overpay up to 10% of any fixed rate loan each calendar year (January to December) without paying an early repayment charge. If you don’t use your full 10% allowance in any calendar year, you won’t be able to carry it over to future years.
If you overpay more than 10% of any fixed rate loan each calendar year, you’ll have to pay an early repayment charge on the amount over 10%.
Not on a fixed rate: You can make unlimited overpayments without paying an early repayment charge.
When the allowance resets
Santander says the allowance does not reset if you change to a different deal during the calendar year.
Plus, your overpayment allowance doesn’t reset if you change to a different deal during the calendar year.
How Santander applies overpayments
Santander says a single overpayment can reduce your term or your monthly payments, as you choose, and that regular overpayments reduce your term.
You can choose between reducing your term or your monthly payments with single overpayments. Regular overpayments will reduce your term.
How to check your own allowance
Santander says you can see your charge and how much of your allowance is left in Mobile or Online Banking.
You can find out what your early repayment charge will be and how much of your 10% overpayment allowance is left in Mobile or Online Banking.
Source: Santander: Mortgage overpayments. Checked on 30 September 2026.
Working out a charge
If you are thinking about overpaying more than an allowance, use our early repayment charge calculator with the figures from your own mortgage offer. Our guides explain what an early repayment charge is, when an allowance resets and how the yearly limit works. If you are unsure, consider speaking to a regulated mortgage adviser.
Questions people ask
How much can I overpay on a Santander mortgage?
Santander says you can overpay up to 10% of any fixed rate loan each calendar year (January to December) without an early repayment charge, that an unused allowance cannot be carried into later years, and that above 10% you would pay a charge on the amount over 10%. For a mortgage that is not on a fixed rate it says you can make unlimited overpayments without a charge. Check your own mortgage offer, because the terms that apply to you are in it.
Where can I see my own allowance with Santander?
Santander says you can see your charge and how much of your allowance is left in Mobile or Online Banking. Your mortgage offer is the document that sets your terms.
Is this the same as my own mortgage terms?
Not necessarily. This page reports what Santander publishes on its own site, as checked on 30 September 2026. Your mortgage offer sets the terms that apply to you, and they can differ by product and by the date you took the mortgage.
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