This is when an unscheduled capital repayment is made or when monthly payments are increased, in order that the mortgage is repaid before the end of the set mortgage term, saving considerable sums in interest. Many traditional (i.e. non- flexible) mortgages have an early repayment charge if overpayments are made within a set period. In contrast, flexible mortgages allow unlimited overpayments without penalty and, increasingly, mortgages are semi- flexible, allowing borrowers to overpay a certain percentage of their loan each year without incurring early repayment charges.