Every UK lender has slightly different overpayment rules — but they all follow the same pattern: an annual fee-free allowance during a fixed or tracker deal, with early repayment charges (ERCs) on anything above it. Here's how it works.
You'll be mortgage-free 6 years 9 months earlier
and save £46,940 in interest.
| Without | With overpay | |
|---|---|---|
| Term | 25 years | 18 years 3 months |
| Total interest | £156,277 | £109,338 |
| You save | £46,940 · 6y 9m |
A lower interest rate could save you thousands more on top. See if you could remortgage to a better deal.
We may receive a commission if you remortgage through a partner broker. This never affects the rate you're offered.
Almost every UK lender — Halifax, Nationwide, Santander, NatWest, Barclays, HSBC, Lloyds, TSB, Virgin Money — allows you to overpay up to 10% of your balance each year without any early repayment charge. Some use the outstanding balance, some use the original loan amount; always check your specific offer.
The 10% is per calendar year for most lenders, but a few use the deal anniversary date. Going £1 over the cap can trigger ERCs on the full overpaid amount above the limit.
ERCs are typically 1% to 5% of the amount overpaid above the cap. They usually taper across the deal — for example 5% in year one of a 5-year fix down to 1% in year five.
On a Standard Variable Rate (SVR), ERCs almost always disappear — you can overpay (or fully repay) without penalty.
By default, most UK lenders apply overpayments to shorten your term while keeping your monthly payment the same — this generates the biggest interest saving.
Most will let you switch to 'reduce monthly payment' on request, but it's less efficient. Some lenders process overpayments instantly; others recalculate at month-end or year-end.
Interest-only mortgages: overpayments reduce the capital balance — useful, because at the end of the term you need to repay the full amount.
Offset mortgages: 'overpayment' usually means leaving money in a linked savings account, which reduces the interest charged without losing access to the cash.
Buy-to-let mortgages: rules are similar but ERCs and caps vary more — check your specific product.
Important: This article is for general information and is not financial advice. Always speak to a qualified UK mortgage adviser before making decisions about overpayments, remortgaging, or your specific mortgage product.