Net terms usually count calendar days from the invoice date unless the agreement says otherwise. Choose a preset or enter custom days above. The result includes the weekday so weekends and holidays are easy to spot.
Write the actual due date on the invoice as well as “Net 30.” A specific date removes ambiguity for the customer and accounts-payable team.
How invoice due dates are calculated
For Net 30, add 30 calendar days to the invoice issue date. “Due in 30 days” is not normally the same as “due at the end of next month.” If business days, end-of-month terms or holiday adjustments apply, state them explicitly.
Check the underlying contract or purchase order before changing terms. The invoice should reflect the payment terms already agreed, not introduce a new term after the work.
Turn the result into a real document
The calculator is for the math. Use the free generator to itemize the work, add customer details and download a PDF, Word or Excel file.
Create an invoiceContinue through the invoice workflow
Frequently asked questions
Does Net 30 include weekends?
Usually yes: net terms are generally calendar days unless the agreement specifically says business days.
Does the invoice date count as day one?
This calculator adds the stated number of full days to the issue date, so a July 1 invoice on Net 30 is due July 31.
What if the due date falls on a weekend?
Your contract controls. Many businesses accept the next business day, but it is clearer to state that rule in the payment terms.