"Net 30" generally means 30 days from invoice date. BUT it can also mean 30 days from when performance is provided, in this case the delivery date. Since the invoice date can be controlled by the company issuing the invoice, the company can easily back date an invoice to effectively make it due on receipt. In this case, I would interpret "net 30" to mean 30 days from delivery date. I hope this helps. You should review the contract and see if the "net 30See More...See More...