Find out how accounting needs receipts sorted and organized. Then do that step for them. It makes no sense to them. Including a layperson's glossary of your charges may save the accountant from tracking you down to gain clarification. Even if you have submitted expense reports in the same format for all eternity, ask your accountant what works best.
Tax laws change often.
And accurate reports equal faster and easier turnaround. Next, learn your company's accounting processes. Normal processing time. Say your company needs a minimum of three days to process a simple bill. The cutoff to receive a bill or check request is noon Wednesday.