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Invoice due-date calculator
Calculated due date = the entered start date + N calendar days. For a term starting on the invoice date, Net 30 adds 30 days, including weekends and holidays. Your agreement determines when the count actually starts.
Calculate the due date
Invoice due date
A term can begin from the invoice date, receipt date, completion date, or another agreed event. This calculator starts from the invoice date you enter; your contract and stated payment terms govern the real deadline. No entered information is stored or sent anywhere.
How it works
What does Net 30 mean?
When your agreed term starts on the invoice date, Net 30 means adding 30 calendar days to that date. Net 7, Net 14, Net 15, Net 45, Net 60, and Net 90 use the same arithmetic with a different number. The calculation is:
Due date = invoice date + payment-term calendar days
This calculator counts weekends and public holidays because they are calendar days. It does not apply end-of-month terms, business-day rules, holiday adjustments, late fees, or jurisdiction-specific legal deadlines. If the agreement starts the term when the customer receives or accepts the invoice, enter that agreed start date instead.
Which date starts the calendar-day count?
The entered date is day zero: 1 September plus one calendar day is 2 September. “Due on receipt” means the actual receipt date, which may differ from the invoice date; choose zero days only after entering the correct start date. The calculator adds whole dates, not 24-hour periods from a timestamp.
Net 30 example
1 September 2026 → 1 October 2026
Thirty calendar days are added to the invoice date. September has 30 days, so the result falls on the first day of October.
Net 14 example
20 December 2026 → 3 January 2027
The fourteen-day count continues through weekends and public holidays. Use a different result only when your agreement specifies another rule.
For the complete mobile workflow, read how to create, export, and send an invoice on iPhone. InvoiceCove keeps the document and its payment status together; it does not collect the payment for you.