What payment terms mean
Net terms state how many calendar days follow the invoice date before payment is due. Net 30 normally means the due date is 30 calendar days after the invoice date.
Invoice Due Date Calculator
Calculate an invoice due date from payment terms
Choose the invoice date and payment terms from Net 7 through Net 90, due on receipt or a custom number of days.
Inputs
Result
- Due date
- September 21, 2026
Calendar days and business days
This calculator adds calendar days. If a contract says business days, or local rules move deadlines that fall on holidays, calculate that adjustment separately.
Use the agreed starting date
Some agreements start the clock when an invoice is received, accepted or approved rather than when it is issued. Use the date specified in the contract.
Choose the right starting event
If an invoice dated 5 May carries Net 30 terms, this tool returns 4 June by adding 30 calendar days. That is correct only when the invoice date is the agreed starting point. Some contracts start the period on receipt, acceptance of services, approval by procurement or delivery of complete supporting documents.
Before relying on the result, compare the invoice wording with the signed agreement and the client's purchasing process. If the term says business days, end of month or a fixed date, use that wording rather than treating it as ordinary Net terms. Record any later correction or credit note that changes the payment timeline.
Frequently asked questions
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General informational estimate, not legal advice.