Direct answer
Start with the invoice date, add the required number of business days, skip weekends, and skip holidays or closure dates that apply to the payment rule.
Working formula: Due date = invoice date plus required business days, excluding non-business days.
Open Business Days CalculatorA realistic workplace example
If an invoice is approved on Monday and payment is due in 10 business days, weekends are skipped. A holiday in the middle can push the due date one more business day later.
Invoice/approval date: Monday; term: 10 business days; weekends skipped; custom holidays skipped; due date: calculated business-day target.
Comparison table
| Input | Check | Result |
|---|---|---|
| Search question | business days from invoice date | Start with the invoice date, add the required number of business days, skip weekends, and skip holidays or closure dates that apply to the payment rule. |
| Formula | Due date = invoice date plus required business days, excluding non-business days. | If an invoice is approved on Monday and payment is due in 10 business days, weekends are skipped. A holiday in the middle can push the due date one more business day later. |
| Copyable result | Keep assumptions visible | Invoice/approval date: Monday; term: 10 business days; weekends skipped; custom holidays skipped; due date: calculated business-day target. |
How to check it without overthinking
Key checks
- Confirm whether the term says calendar days or business days.
- Choose the correct start date: invoice date, approval date, or receipt date.
- Decide whether the start date counts as day one.
- Skip weekends and listed holidays.
- Save the due date with the assumptions.
Mistakes that change the answer
Do not treat Net 30 as business days unless the agreement says business days.
Do not count the start date without checking the rule.
Do not ignore bank holidays or company closure dates when they apply.
Copy this note
Invoice/approval date: Monday; term: 10 business days; weekends skipped; custom holidays skipped; due date: calculated business-day target.
If you send the result to payroll, HR, a manager, or a client, include the inputs and the rule you used. That makes the number easier to verify.
Useful next pages
Related page: /guides/how-to-calculate-business-days-for-net-30-invoice/
Related page: /guides/how-to-check-if-a-net-30-invoice-is-overdue/
Related page: /tools/work-days-calculator/
Open Business Days Calculator