Net 30 payment terms appear on an invoice and notify customers that they have 30 days to pay the invoice balance, but there can be different ways to offer Net 30:
30 calendar days (most common)
30 business days
Net 30 End of Month (Net 30 EOM)
Net 30 EOM means payment is due 30 days after the end of the month the invoice was issued or received. For example, if an invoice is issued on April 23, payment would be owed by May 31.