What Does EOM 30 Mean on an Invoice?
EOM 30 means an invoice is due 30 days after the end of the calendar month it was issued in, not 30 days after the invoice date itself. The actual wait can range from just over a month to nearly two months, depending on when in the month the invoice was raised.
What EOM 30 Means
"EOM" stands for "end of month." Under EOM 30, the 30-day count starts from the last day of the month the invoice was issued in, not from the invoice date. So an invoice raised on 5 March is due 30 days after 31 March — around 30 April — while an invoice raised on 28 March is due at almost the same date, since both fall in the same calendar month.
Worked Example
| Invoice Date | Due Date | Approximate Wait |
|---|---|---|
| 3 March | 30 April | About 58 days |
| 15 March | 30 April | About 46 days |
| 30 March | 30 April | About 31 days |
Every invoice issued in March gets the same 30 April due date under EOM 30, regardless of the exact day it was raised within that month.
EOM 30 vs Net 30
| Term | How the due date is set | Typical wait |
|---|---|---|
| Net 30 | 30 days after the invoice date | 30 days, every time |
| EOM 30 | 30 days after the end of the invoice month | 31 to 60 days, depending on invoice date |
Net 30 gives every invoice the same fixed window. EOM 30 batches every invoice from a given month onto one shared due date, which suits suppliers who invoice frequently and want customers to settle a full month's purchases at once, but which lengthens (and evens out unevenly) the wait for cash compared to Net 30.
EOM 30 vs "20th of the Month Following"
Both terms tie the due date to the calendar month rather than the invoice date, but they land on different days. EOM 30 sets the due date 30 days after month end (effectively the 30th or 31st of the following month), while "20th of the month following" sets it on the 20th of the next month — roughly 10 days earlier for the same invoice. They're easy to confuse since both are common on New Zealand trade accounts, so it's worth checking exactly which one applies to a given account.
Frequently Asked Questions
Is EOM 30 the same as "30 days end of month"?
Yes, "EOM 30" and "30 days end of month" describe the same term: 30 days added to the last day of the invoice month.
Why do invoices issued early in the month wait longer under EOM 30?
Because the due date is fixed to the end of the month regardless of the invoice date, an invoice raised on the 3rd waits almost a full extra month compared to one raised on the 28th, even though both share the same due date.
Is EOM 30 common in New Zealand?
Yes, it's widely used alongside Net 30 and the 20th of the month following, particularly on trade and wholesale accounts that invoice customers monthly.
How do I calculate an EOM 30 due date?
Find the last calendar day of the month the invoice was issued in, then add 30 days to that date.
Does EOM 30 affect supplier cash flow more than Net 30?
Generally yes, because the effective wait ranges from 31 to almost 60 days depending on the invoice date, averaging longer than the flat 30 days under Net 30.
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Read next: what "20th of the month following" means, or what Net 30 means.
