>That is called open balance accounting and the fact that you are tracking invoices doesn't matter. You apply the amount of the check to the oldest invoice with a balance due until it is paid in full, then apply to the next oldest etc..
>
>Without dated invoices there is NO WAY to get account aging because the date of the transaction and the amount of the transaction are not together in one place.

Ok, let me talk this through. Each trip is an invoice. Along with the trip information, I have a field for how much is paid on that trip. When a check comes in, I go trip by trip, paying them off until I run out of money. It's a little more complicated for me because I have to apply it to trips that are a certain amount old rather than the oldest, but I think I can handle that part. Is that right?

So what do I do if I run out of trips before I run out of money to apply? Where do I put the credits?

I'm still confused on how I make the statements from that. If I'm not storing the balance anywhere, how do I calculate the balances?

I appreciate you taking the time to help me through this. Hopefully I'll "get it" soon. :)

-Michelle