Net 10th Prox is a business invoice payment term that makes every invoice issued during a calendar month due on the 10th of the following month. The date on the invoice itself doesn’t start a countdown. Instead, every invoice from June, whether dated June 1 or June 28, comes due on July 10.
What the Words Mean
“Net” means the full face value of the invoice is owed, with no discount applied. “10th” is the calendar day payment lands on. “Prox” is short for the Latin proximo mense, meaning “in the next month,” so the 10th in question is the 10th of the month after the invoice was issued. Infor’s enterprise software documentation traces the term to retail, where invoices that missed a cutoff for one month rolled into the next month’s cycle, much like a credit card statement.1Infor. What Is a Prox Term
Variations follow the same logic with a different day. Net 15th Prox is due on the 15th of the next month, Net 25th Prox on the 25th, and so on.
How the Due Date Is Calculated
The rule is one date for a whole month of invoices. Oracle’s proximate date documentation gives a clean example: an invoice dated May 20 with a proximate month of 1 and a proximate day of 10 is due June 10.2Oracle. Proximate Date Payment Terms
The practical effect is that the credit period a buyer actually gets swings widely with the invoice date. A June 1 invoice gives 39 days to pay. A June 28 invoice gives 12. Same term, very different timelines. If your accounts payable process assumes a consistent window, late-month invoices can catch you short.
The Cutoff Date
To prevent that squeeze, many Prox arrangements include a cutoff. An invoice issued within a set number of days before the due date isn’t payable until the following month’s cycle. Aptora’s payment terms documentation describes this mechanism directly.3Aptora Corporation. Payment Terms List With a cutoff of the 25th, an invoice dated June 27 would skip past the July 10 due date and become payable August 10.
Cutoffs are not automatic. If your vendor agreement says “Net 10th Prox” without naming a cutoff day, every invoice issued during the month is due on the 10th of the next month, no matter how late in the month it was written. This is the kind of detail that belongs in the written contract rather than left to assumption.
Early Payment Discounts
Prox terms can include a discount for early payment. A term written as “1% 10th Prox Net 25th Prox” means the buyer earns a 1 percent discount by paying by the 10th of the next month, with the full balance due by the 25th. Oracle illustrates a related setup: an invoice dated June 14 with a 1 percent discount, 10 discount days, a proximate month of 1, and a proximate day of 10 has a discount due date of June 24 and a net due date of July 10.2Oracle. Proximate Date Payment Terms
A 1 percent discount for paying roughly 20 days early works out to about 18 percent annualized. Small on any single invoice, but it adds up across a year of purchasing.
Net 10th Prox vs. Net 30 and EOM Terms
Net 30 starts a 30-day clock from each individual invoice date, so every transaction has its own due date. Net 10th Prox pins every invoice from the month to one calendar date. That’s the core difference.
End of Month (EOM) terms fall between the two. “Net 10 EOM” means payment is due 10 days after the end of the invoice month, so a June invoice comes due July 10, which happens to match Net 10th Prox exactly. The two approaches can produce the same result, but they get there differently, and they diverge when the day count and the calendar day don’t line up. A contract should say which method applies rather than treat them as interchangeable.
When the 10th Falls on a Weekend or Holiday
Commercial contracts commonly include a provision shifting a due date that lands on a non-business day to the next business day. If July 10 is a Saturday, payment would be due Monday, July 12. This is a contractual provision, not an automatic default. If the agreement is silent on the point, the safest move is to pay before the 10th rather than after.
What Happens If You Pay Late
Missing a Prox due date carries the same kinds of consequences as missing any other invoice deadline. Specific penalties depend on the contract and applicable state law, but late payment interest rates in commercial agreements typically run around 10 to 24 percent annually. Some states have prompt payment statutes that impose their own interest rates on overdue commercial invoices, often in a similar range.
Interest is only part of the picture. Chronic lateness can trigger credit holds, shortened payment terms on future orders, or loss of discount privileges. Because Prox terms concentrate a full month of invoices into one due date, missing that date puts every invoice from the prior month past due at the same time. That’s a heavier hit than missing a single Net 30 deadline.
Setting Up Net 10th Prox in Accounting Software
Most accounting and ERP systems handle Prox terms through a “date-driven” payment term rather than the standard day-count method. In QuickBooks Desktop, you add a new term under the Customer and Vendor Profile Lists, choose Date Driven, and enter the calendar day along with the month offset.4QuickBooks Community. How to Enter Payment Terms for Net Due 1% 10th Prox, Net 15th Prox Enterprise platforms like JD Edwards use proximate month and proximate day fields to do the same thing.2Oracle. Proximate Date Payment Terms
If your software doesn’t support date-driven terms natively, the workaround is to set due dates manually on each invoice. That defeats much of the reason to use Prox terms in the first place. If a cutoff date is part of the deal, configure it in the software as well, or late-month invoices will show artificially short due windows and generate false overdue alerts.