yiu
I know that in the credit union union of which i am a member you would be given a choice of what you would want your new payment to be after making a lump sum lodgment. So for e.g it it was your family member who are now 5000 prepaid they would be asked how soon do they want to repay the remaining €1k if they want to keep to the original agreement the repayments would be a lot less however the member may wish to repay the loan faster therefor the reduction might not be as great.Don't know if i have explained myself very well with this post so apologies if i haven't.