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Invoice due date calculator

Pick an issue date and a payment term. Get the exact due date, with optional weekend and US holiday skipping. No signup, no fluff.

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An invoice due date is the issue date plus the payment term. Net 30 means thirty calendar days from the issue date. EOM (End of Month) means the last day of the month the invoice was issued in. The right answer depends on whether your client treats the term as calendar days or business days, and whether they pay on weekends and holidays. This calculator handles all four combinations and shows the exact date below.

Due date

Pick a date and a term above.

Why this matters more than a quick mental sum

A wrong due date sounds harmless until your AP team uses it as the trigger for a 30-day approval window. A four-day mismatch can push your payment a full month.

Net 30 is calendar days, not business days

A Net 30 invoice issued on a Friday is due on the Sunday four weeks later. Most AP systems will treat the next business day (Monday) as the actionable date, but some aggressively flag anything that arrived 'late' to the queue.

EOM is locale-dependent

In the US and UK, EOM almost always means the last day of the month. In some EU contracts, EOM means '30 days after the end of the month,' which is functionally Net 30 from the 1st of the next month. Confirm with the buyer before you assume.

Holidays push real cash flow

If the due date is December 25 and the client pays on the next business day, that is a 1-2 day swing in your bank account. Multiply by every Q4 invoice and it matters.

The calculation drives the late fee

Most late-fee clauses trigger N days past the due date. If the due date is wrong, the fee starts accruing on the wrong day, and you cannot defend that in a dispute.

Use the result downstream

Calculate the late fee

If this due date passes, our late fee calculator works out a defensible amount.

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Generate the follow-up email

Pre-written templates for polite, firm, and final-notice nudges, with the due date pre-filled.

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Send a real invoice with this date

Skip the PDF. Make an invoice your client can view, edit, and approve at a private link.

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Due date calculator FAQ

Is Net 30 calendar days or business days?

Net 30 is calendar days from the invoice issue date in standard US and UK usage. If your client treats Net 30 as business days, multiply by roughly 1.4 (or use a custom day count of 42 here).

What does EOM mean exactly?

EOM stands for 'End of Month' and means the last calendar day of the month the invoice was issued in. EOM 15 means 15 days after the end of that month. Some EU contracts use EOM differently, so confirm with the buyer for cross-border work.

Should I skip weekends and holidays?

Only if the contract or your buyer's AP policy says so. Most US contracts state due dates as calendar days, and the client simply pays the next business day. Some industries (government contracting, healthcare) work strictly in business days.

Which holidays does this skip?

US federal holidays: New Year's Day, MLK Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas. State, religious, and international holidays are not included.

Does the due date affect when I can charge a late fee?

Yes. Most late-fee clauses begin accruing N days after the due date (often 'after 30 days past due'). A wrong due date moves the fee start date and weakens your position in a dispute.

Can I use this for a recurring invoice?

Yes. Run the calculator for each issue date in the recurring schedule. JupiterInvoice's product handles the recurrence and calendar logic automatically when you graduate from the tool to a real invoice.