A homeowner with a £380,000 mortgage at a 1.1% interest rate, which is fixed until January 2027, is considering whether to use their £65,000 in cash Isa savings to pay down the mortgage before their rate significantly increases. Current mortgage rates are around 4%, and while interest rates have eased from their peak, the homeowner anticipates a substantial increase in monthly payments when they remortgage. For example, a £315,000 mortgage at 3.9% would cost £3,309 per month, an increase of nearly £500 compared to their current payment of £2,818. Using their Isa savings to pay down the mortgage at that point would reduce the monthly payment on the remaining balance to £2,742.64.
Currently, the homeowner's cash Isas are earning just over 4% interest, which is higher than their mortgage rate, meaning they are earning more on their savings than their mortgage is costing them. Therefore, there is no immediate financial benefit to overpaying on the mortgage. Lenders typically allow penalty-free overpayments of up to 10% annually, so the homeowner could make a partial overpayment of £38,000 before their current deal ends. However, the advice suggests holding off on overpaying for now, as current savings rates outpace the mortgage interest.
The situation is expected to change by January 2027 when the homeowner's fixed rate ends. At that point, the mortgage rate is set to rise significantly, and savings rates may fall. This shift in rates will likely make reducing the mortgage balance a more attractive option, effectively earning the mortgage rate on their savings. The homeowner also needs to consider their plans to downsize in the next five to seven years to help their children, their pension lump sum of £75,000 in seven years, and the need to retain an emergency fund. Other factors to consider include potential changes to Isa allowances and income tax on savings interest. While there is no immediate advantage to overpaying, the case for reducing the mortgage balance will become stronger in about a year's time when the current deal expires, helping to mitigate the impact of higher future mortgage payments.