Mortgage Overpayment Calculator
Lump-sum overpayment
Overpay to target payoff date
Standard monthly PMT
£0
Standard total interest
£0
Overpay total interest
£0
Standard payoff time
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Overpay payoff time
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Time saved / Interest saved
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Chart: balance over time – green shows faster payoff. Hover tooltips not included to keep it lightweight.
Chart: cumulative interest – gap at the end equals interest saved.