Plan
Invoice Payment Timing Calculator
Calculate an invoice due date and show how many days early or late a payment arrived.
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Result
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Complete the fields on the left. The result becomes the focus of the workspace when it is ready.
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Calculate days early or late
The due date is the invoice date plus the number of calendar days in the payment terms. Payment timing is the comparison date minus the calculated due date: a negative difference is early, zero is on the due date, and a positive difference is late.
For an invoice dated March 1 with Net 30 terms, the calculated due date is March 31. A payment date of April 3 is 3 calendar days late; a payment date of March 28 is 3 days early.
Check the terms that apply
The calculator does not adjust for weekends or public holidays and does not interpret contract-specific rules such as receipt dates, business-day counting or cutoff times.
This page compares a payment date with its due date. Use Invoice Due Date Calculator when you only need the due date from the invoice date and terms.
Related calculations: Invoice Due Date Calculator · Accounts Payable Aging Calculator
Need help?
Only the details you need.
The tool is intentionally simple. Open an answer only when you need it.
How does this tool work?
- Enter the invoice date and payment terms in days.
- Enter the actual payment date if the invoice was paid.
- See the due date and the number of days early or late.
Is the due date based on calendar days?
Yes. This calculator adds the number of calendar days you enter. It does not automatically adjust for holidays.
What if the invoice is still unpaid?
Use today as the comparison date if you want to see how many days overdue it is, or leave payment timing to your receivables report.
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