Invoice Due Date Calculator
Calculate the exact payment due date for Net 7, Net 14, Net 15, Net 30, Net 45, Net 60, Net 90 and custom payment terms.
Print the result only, or include the calculator inputs with your estimate.
How to calculate an invoice due date
An invoice due date is the deadline agreed between a supplier and a customer. This free calculator helps freelancers, contractors, agencies, and small businesses estimate a deadline from an invoice date and payment term. Free to use — no sign-up required.
Choose the invoice date, select a standard term such as Net 7 or Net 30, or enter a custom number of calendar days. If your agreement specifies a weekend adjustment, choose whether to keep the calculated date or move it to the previous or next weekday.
Common invoice payment terms
- Due on receipt: payment is expected when the invoice is received, subject to the agreement.
- Net 7 / Net 14 / Net 15: payment is generally due 7, 14, or 15 calendar days after the agreed starting date.
- Net 30: payment is generally due 30 calendar days after the agreed starting date.
- Net 45 / Net 60 / Net 90: longer payment windows of 45, 60, or 90 days.
- Custom terms: enter the exact number of days written in your contract or purchase order.
Example: Net 30 payment terms
If an invoice date is 1 October and the agreed term is Net 30, adding 30 calendar days gives a calculated date of 31 October. Counting rules and the event that starts the payment period may differ by agreement or local law, so confirm the final deadline with your customer.
Calendar days, business days, weekends, and holidays
This calculator adds calendar days. It does not automatically remove public holidays or calculate business-day-only terms. The optional weekend setting changes a Saturday or Sunday due date only; it does not check local holidays. If your contract uses business days or a special holiday rule, verify the result manually and document the agreed deadline.
How to use this calculator
- Select the invoice date.
- Choose the payment term or select custom days.
- Choose how a weekend deadline should be handled.
- Select Calculate Due Date and review the deadline and status.
- Copy or share the result, or use Print / Save PDF to keep a record.
Why a clear due date matters
A specific due date reduces misunderstandings, supports cash-flow planning, and makes payment reminders easier to write. Put the invoice date, due date, currency, amount due, payment method, and agreed terms on the invoice. For larger jobs, consider milestone invoices when the client has agreed to them.
This is a planning tool, not a legal determination. Your contract, customer terms, applicable local rules, and any relevant holiday provisions determine the actual payment deadline.
Invoice due date calculator FAQs
Does this calculator count business days?
No. It adds calendar days. It does not skip weekends or public holidays automatically. Use the weekend option only for a simple Saturday/Sunday adjustment, and verify business-day terms separately.
Can I enter a payment term that is not listed?
Yes. Choose “Custom number of days” and enter a whole number from 0 to 3,650 days to calculate a custom deadline.
What does “Due on receipt” calculate?
It uses zero additional days, so the calculated date is the invoice date. Your agreement may define when an invoice is considered received.
Can I move a weekend due date?
Yes. Select “Move to next weekday” or “Move to previous weekday.” The calculator does not determine whether your contract or local rules require that adjustment.
Does the calculator save my invoice information?
The calculator runs in your browser and does not submit the values to a GenFreeInvoice server. Your browser may still retain information according to your own device and browser settings.
Is the calculated date legally binding?
No. It is a date estimate based on the values you enter. Confirm the payment deadline against the signed agreement, invoice terms, and rules that apply to your transaction.
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Learn about invoice payment terms
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