Question

What is an early repayment charge on a mortgage?

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An early repayment charge (ERC) is a fee for repaying more of your mortgage than the lender permits, or repaying it entirely, during a fixed or discounted deal period.

Why it exists. When a lender offers a fixed rate, it typically hedges that commitment by securing funding at a matching cost for the same period. If you repay early, the lender is left with the funding arrangement and no loan. The ERC compensates for that, and is why fixed rates can be offered at all.

How it is calculated. Usually a percentage of the amount repaid, and typically tapering over the deal — for example 5% in year one, falling by a percentage point each year to 1% in year five. Some lenders charge a flat percentage throughout. The charge applies to the balance at the point of repayment, and on a large mortgage it can be a very substantial sum.

The overpayment allowance. Almost all fixed deals permit overpayments of up to a stated amount each year — commonly 10% of the outstanding balance, though it varies and some lenders base it on the original balance instead, which matters. Overpay within that and there is no charge.

When an ERC is triggered:

Repaying the mortgage in full, including on sale, unless you port.

Remortgaging to another lender before the deal ends.

Overpaying above the allowance, on the excess.

When it usually is not:

Porting. Most deals allow you to take the mortgage to a new property, subject to fresh affordability and valuation checks. Porting is not a right in practice — you must requalify, and people are refused.

Switching to a new deal with the same lender at the end of the term, or sometimes shortly before.

The arithmetic worth doing. If rates have fallen considerably, paying an ERC to move can still be worth it. Compare the charge against the total saving over the remaining period, including any product fees — a broker can model this, and the answer is not always what people assume.

Check the timing. Many deals allow switching in the final months without charge, and ERC periods end on a specific date, not on a whole month.

General information, not financial advice.

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