Net 30 Due Date Calculator
Need to know exactly when an invoice payment is due? This free net 30 due date calculator turns any invoice date and payment terms into an exact payment due date — Net 10, Net 15, Net 30, Net 45, Net 60, Net 90, due on receipt, or a custom number of days. It also tells you how many days are left until payment is due, and flags due dates that fall on a weekend so you can plan around them.
Enter your invoice details
Your results
Enter an invoice date to see the payment due date.
How to use this calculator
Enter the invoice date — the date printed on the invoice, not the date you received it (unless your contract says otherwise). Then choose the payment terms: Net 10, 15, 30, 45, 60, or 90, "Due on receipt," or a custom number of days if your contract uses something unusual like Net 21 or Net 120. The due date recalculates the moment you change anything, and the Calculate button re-runs it at any time.
The result shows the exact due date with its weekday, how many days are left until it is due (or how many days overdue it already is), and a weekend warning if the due date lands on a Saturday or Sunday — handy because bank transfers often don't clear on weekends.
One important distinction: this tool counts calendar days, which is how standard payment terms work. If your contract counts only working days, head over to our Business Days Calculator instead.
How it works
The math is simple and exact: due date = invoice date + term days, counted in plain calendar days — weekends and holidays included. "Due on receipt" adds 0 days, so the due date is the invoice date itself. A custom term adds whatever number of days you enter, and the calculation rolls over months and years correctly (September 21 + 30 days = October 21).
Every date is parsed as a UTC midnight timestamp built from the year, month, and day in your YYYY-MM-DD input, so the result is the same instant in time regardless of your device's time zone — no daylight-saving surprises. The "days until due" figure is computed against today's date in the same UTC calendar.
These results are exact date arithmetic, not estimates — but they follow standard contract conventions. Always check your own contract: some agreements define terms differently (e.g., "Net 30 EOM," meaning 30 days after the end of the month) or shift weekend due dates to the next business day. This tool does not give legal or financial advice.
Frequently asked questions
What does “Net 30” mean on an invoice?
“Net 30” means payment is due 30 calendar days after the invoice date. For example, an invoice dated September 21 with Net 30 terms is due October 21. The “net” number is always the number of days you have to pay: Net 15 gives you 15 days, Net 60 gives you 60 days, and so on.
Is a Net 30 due date counted in calendar days or business days?
Calendar days. Unless your contract explicitly says “business days,” payment terms like Net 30 count every day — weekends and holidays included. If you need to count only working days, use our Business Days Calculator instead.
What happens if the due date falls on a weekend?
The due date does not move — Net 30 is still the 30th day even if it lands on a Saturday or Sunday. However, banks and payment processors often do not process transfers on weekends, so many businesses pay the Friday before or the Monday after. This calculator flags weekend due dates so you can plan around them.
What does “due on receipt” mean?
It means payment is due the same day the invoice is received — 0 days are added to the invoice date. It is the strictest common payment term and is often used for new customers, rush orders, or services where payment is expected immediately.
What happens if I pay after the due date?
The invoice becomes overdue. Many contracts add late fees or interest once the due date passes, which you can estimate with our Invoice Late Fee Calculator. Repeated late payments can also damage your business credit and your relationships with suppliers.