Financial Software Questions? Ask IT Support for Answers ASAP
What billing software do you use?
This could make a difference. However, I would think that there should be a way of entering a new classification for the "due date" that would allow you to specify that 50% was due with invoice and the balance due net 30 after delivery or whatever your policy might be.
In programs like Quickbooks, you can bill the entire amount and include a separate line on the invoice to instruct that 50% of total bill is due upon receipt.
The method may be different depending on your program.
If you could provide additional information I will see if I can fully answer your question.