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Overpayment - Lump vs Monthly - Would like to work out how much saving?

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Hey all,

Pretty new to the forum so apologies if make any mistakes.  Ive been rattling my brain trying to figure this out and been going at it so long i have mentally over complicated things, so hoping someone knows the formula as i am feeling in my gut it is an easy maths problem.

I currently have a mortgage that has a fixed 1.64% interest rate.  Currently it has a £3,206.45 OVERPAYMENT allowance until September 30th 2022 i could clear.  I am currently clearing this buy paying £801 per month for another 4 payments.  I also have the means to pay the balance off in one lump sum payment.  Can anyone tell me how much interest total, i will be saying from paying it as a lump sum vs paying it off monthly in 4 more payments (ideally if there is a tool or a formula you can use even better, should i need to does this again in the future.

Thank you very much
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