Net 30 Calculator

How the Invoice Due Date Calculator works

The formula. Due date = invoice date + the term in calendar days, so Net 30 adds 30 days, weekends included. For example, an invoice dated 5 January 2026 is due on 4 February. A second example: 30 January plus 30 days crosses a 28-day February and lands on 1 March. The readout then shows how many days remain before payment is late.

Net 30 means payment is due thirty calendar days after the invoice date. It is one of the most consistently misread phrases in commercial paperwork, and almost every dispute about it comes from one of four assumptions that are not in the term.

Net 30 is calendar days, not business days. Thirty calendar days is roughly twenty-one working days. If you meant twenty-one working days you must write that, because "Net 30" will be read as calendar days by any accounts department, any court, and any statutory interest calculation. The difference is over a week of cash flow on a single invoice.

"Net" means the full amount with no discount. The word exists to distinguish it from terms like 2/10 Net 30, which means the buyer may deduct 2% if they pay within ten days, otherwise the full amount is due at thirty. That 2% for paying twenty days early is an annualised return of roughly 37% for the buyer, which is why large companies take it routinely and why offering it is expensive for the seller.

The clock starts from the invoice date unless the contract says otherwise. Some agreements run the term from delivery, from acceptance, or from the end of the month in which the invoice was issued. "Net 30 EOM" is materially different from Net 30 — an invoice issued on the 2nd is not due until the 30th of the following month, nearly sixty days later. If your contract uses EOM terms, enter the last day of the issue month here rather than the invoice date.

Weekends and bank holidays are not automatic extensions. Nothing in the term itself moves a due date off a Saturday. In practice most payment runs happen on weekdays, so a due date on a weekend is usually settled on the Friday before or the Monday after depending on the payer's policy. Some contracts state the rule explicitly, which is why the rollover behaviour here is a choice rather than a default. This tool does not know your jurisdiction's bank holidays, so a weekday due date may still fall on a public holiday.

Shorter terms are a legitimate lever. Net 30 is a convention, not a rule. For a small supplier the cash-flow cost of thirty days is real, and Net 14, Net 7 or payment on receipt are all negotiable with clients who are not large corporates with fixed payment runs. Where the term cannot move, a deposit up front, milestone billing or a stated late-payment interest rate on the invoice does much of the same work. Whatever you agree, the terms need to be on the invoice itself — a due date printed clearly, rather than a term the reader has to compute, measurably improves how fast invoices are paid.

Net 30 calculator due date table

Net 30 counts 30 calendar days from the invoice date. Rows are 2026 dates.

Net 30 due date for invoices issued through 2026

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