Three conventions, three different dates
Calendar days from the invoice date is the usual meaning of net 30 and the one to assume unless told otherwise. Business days only is used in some contracts and pushes a thirty-day term out by about two weeks. End of month means the clock does not start until the month closes, so net 30 EOM on an invoice dated the 2nd is nearly sixty days.
None of these is wrong. What is wrong is not knowing which one the other side is using, and finding out when you chase.
Put the date on the invoice
Writing 'net 30' and leaving the reader to count is the single easiest way to be paid late without anybody being at fault. Print the actual date. It costs nothing, it removes the convention question entirely, and it gives you something specific to point at when you follow up.
The 2/10 net 30 line
An early payment discount has its own deadline, counted from the invoice date, and it is shown here alongside the due date. Before offering one, check what it costs you annualised. The discount calculator does that arithmetic, and the answer surprises most people the first time.
Related calculators
- Business days calculatorWorking days added, subtracted or counted
- Days past due calculatorHow late it is, and what that age usually calls for
- Late fee calculatorInvoice Due Date CalculatorThe fee, the letter and the clause
Questions people ask
How do I calculate an invoice due date?
Add the payment terms to the invoice date. Net 30 means thirty calendar days from the invoice date unless your contract says otherwise, so an invoice dated the 11th is due on the 11th of the next month.
What does net 30 EOM mean?
The thirty days start at the end of the month the invoice was issued in, not the invoice date. An invoice dated the 2nd on net 30 EOM is not due for nearly sixty days.
Do weekends count in net 30?
Normally yes: net terms mean calendar days unless the contract says business days. This page can count either way, because both conventions are in real use.
What if the due date falls on a weekend or a holiday?
Most businesses pay on the next working day, and most suppliers accept that. If it matters to you, set business-day terms so the due date never lands on a weekend in the first place.
Should the due date go on the invoice?
Yes, as an actual date. 'Net 30' asks the reader to count, and a reader who counts differently from you pays late without anyone being at fault.
What does 2/10 net 30 mean?
Two percent off if paid within ten days, otherwise the full amount is due in thirty. The discount deadline is shown here; the discount calculator works out what offering it costs you over a year.