Free calculator
Invoice Due Date Calculator
Choose a payment term and calculate the calendar date when an invoice is due.
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Use the terms agreed with your client or contract.
Payment terms can depend on your contract and the client's payment process. Use this result as a planning aid and show the agreed due date on the invoice.
Why the actual due date matters
Terms such as Net 15 or Net 30 are shorthand. The invoice should also show a calendar due date so the client does not have to calculate it or guess when the payment clock starts.
Agree on the starting point, calendar-day rule, and any weekend or holiday treatment before work begins. Keep the wording consistent between your proposal, contract, and invoice.
Related free tools
Check the invoice total calculator before sending, or use the payment terms generator to create wording you can adapt.