In the first 5 years of your mortgage, your boost's value is frozen. If you borrow £15,000 and repay £1,000, you'll owe £14,000. Easy.

After 5 years, the value of your boost will step up or down in line with the current value of your property.

If you make any payments at or after that point, we'll use our most recent property valuation to determine what percentage of the outstanding boost your repayment will cover.

Once you make a repayment, we’ll confirm the new outstanding amount of the boost with you.

If you’re in arrears on your main mortgage, you won’t be able to repay the boost – you’ll have to get up to date on your mortgage first.