Net 30 due date calculator

• Invoice on 18 March for 12,000Counting from the invoice date, the due date is 17 April. The retailer's system counts from receipt, 25 March, and shows 24 April. The supplier chases on 18 April and the retailer points to its system date. A contract line, "30 days from the invoice date", ends the argument.
• Same invoice, two start eventsNet 30 from invoice date and net 30 from receipt of a correct invoice can differ by weeks.