Originally posted by: Jeraden
Your calculations appear to be correct assuming you pay off $8000 as a downpayment and still keep a 5yr loan payment, just with a lowered monthly payment.
Its kind of foolish to take a 5yr loan out on just 10k.
If you mean you have a 5yr loan on 17,800, but just make a huge payment of $8000 to start with, then you'll be done with your loan well before 5 years. Looks like you'd have it paid off in under 3 years (assuming you started paying the regular monthly payment after the 1-time 8000 payment). That would end up saving quite a bit more in interest. Thats probably where the logical flaw in your calculation lies.