Sorry I only have time to read the first post and didn't read any others. I work in banking and used to work in consumer lending (including auto loans) for 3 years.
There is a 99% chance that your loan is a simple installment loan which accrues interest every single day, if it's a "rule of 78's loan" then it gets messy and more complicated. So we'll go with the assumption that you have a regular simple interest installment loan.
Here is a great
auto loan calculator complete with graph but I don't know how much your original financed amount was or what your current balance is.
What I need to know is, what is the best way of doing this?
So would be best thing to do be to instead of paying $320 for this months payment, to write a check for $1000 instead, and just include this months coupon?
Yes this is the best option.
Write one check every month for at least $320 per month, no less. Anything you pay OVER the $320 will automatically first satisfy any outstanding interest charges ... remember that interest only accumulates every day and NOT ahead of time. So if your 36 month term loan is paidoff in 12 months then you ONLY paid 12 months of interest and NOT 36 months of interest. So every month send in a check for at least $320 with only one payment coupon. When the bank receives your check and applies your payment they don't care what payment it's for you could mail in an August 2002 payment and they could care less. All they care about is your loan number and the amount you paid, that's it. You're doing the smart thing in paying off your loan early by making monthly payments of around $1,000.00 If you know your current principal balance I can probably find a
loan calculator which would tell you how much you
SAVED which is even more incentive to make large payments. Also don't limit yourself to just paying once a month, if next week you have an extra $500 then mail that in. Also by paying yourself ahead you are satisfying the next months payment so let's say you get injured and can't make a payment for 2 months? No problem because your bank is expecting a $320 payment and when you mail in $1,000 that will make your current payment plus two future months.
Let's say you finance $15,000 and call for your payoff balance after 2 weeks. Your payoff balance would be a total of your principal balance, accrued interest (for 14 days), any outstanding late charges, annual fee, etc.
Sorry for rambling off, I hope this makes sense?
Call your bank Thursday and ask them "What is my per diem"? That's how much interest they are charging you per day. When you realize that it's like $3-$10 per day you'll realize that $10 of interest per day times 30 days = $300 of ONLY interest per month.
If you have any other questions please don't hesitate to ask.