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Invoice due date calculator
Enter the date on the invoice and the terms you agreed. You get the exact due date, the weekday it falls on, how long you are actually waiting, and a reminder schedule you can save to a calendar — calculated in calendar days, the way terms are written.
The date printed on the invoice — not the day the work started.
The corporate standard in the US and Canada, and the safest fallback.
Choose an invoice date and a term to see the due date.
How to calculate an invoice due date
The arithmetic is one line: due date = invoice date + term days. A Net 30 invoice dated 1 October is due on 31 October. The complications are never the arithmetic — they are the three assumptions people make without saying so.
- Calendar days, not working days. Net 30 includes weekends and public holidays. Only terms explicitly written as “30 business days” skip them, and those need a working-day calendar rather than this calculator.
- The invoice date, not the delivery date. Terms start when the document is issued. If you finish the work on the 3rd but invoice on the 20th, the client's clock starts on the 20th — which is one reason late invoicing quietly costs you a month of cash flow.
- One due date, written out. “Net 30” makes the client do date arithmetic in their head, and accounts-payable teams do not. Print the actual date on the invoice and both sides are working from the same fact.
If the invoice is going out today, the fastest route is to create it in the free generator, which stores the date, the terms and the line items in one place — and then use this page to check the date it promises.
The invoice lifecycle
Net 30, Net 14, Net 60 — and what long terms actually cost
Payment terms are a financing decision disguised as a formality. Every extra day between issuing an invoice and being paid is a day you have delivered the work but not been paid for it. The chart below scales the common terms against each other.
What each payment term asks you to fund
| Term | Days | When it makes sense |
|---|---|---|
| Due on receipt | 0 | New clients, one-off jobs and deposits — nothing is left to interpretation. |
| Net 7 | 7 | Small, fast-moving jobs where a week is a realistic approval cycle. |
| Net 14 | 14 | The common freelance default in the UK, Australia and South Africa. |
| Net 30 | 30 | The corporate standard in the US and Canada, and the safest fallback. |
| Net 45 | 45 | Larger companies with a fixed twice-monthly payment run. |
| Net 60 | 60 | Enterprise procurement — price the extra waiting time into the quote. |
| Net 90 | 90 | Rare outside large supply chains; a 90-day wait is effectively a loan. |
A longer term is not automatically worse — enterprise clients often cannot pay on a freelance schedule. What matters is that the term was agreed before the work, and that the price reflects the wait. Our guide to invoice payment terms covers deposits, early-payment discounts and how to put a late fee in writing.
What if the due date falls on a weekend?
The calculator reports the real calendar date, even when it is a Saturday or Sunday. That is deliberate: a due date is part of the contract you sent, and silently moving it is not the tool's decision to make. In practice most finance teams release payments on the next working day, so a Saturday due date usually clears on Monday.
If you would rather avoid the ambiguity, choose the term before you issue the invoice and move the date forward to the preceding Friday, then write that date on the document. What you should not do is rely on the client to make the adjustment themselves — “due Friday 30th” and “Net 30” describe different dates on the same invoice, and the client will pick the later one.
The reminder schedule this calculator builds
A due date only produces money if someone acts on it. The three dates above are the minimum viable sequence for a small business:
- Three days before the due date — a friendly reminder. Not a chase: a one-line note confirming the invoice number, the amount and the payment reference. It catches the invoice that never reached accounts payable before it becomes overdue.
- Seven days after — the first follow-up. Ask whether anything is missing, attach the invoice again and restate the due date. Keep it factual; this is the message you may later need to show you sent.
- Fourteen days after — a final notice. State the outstanding balance, what happens next (late fee, work paused, collections) and give a specific date for payment. If your terms include interest, calculate the amount rather than estimating it.
Put the dates in your calendar now, while the invoice is fresh. The “Add due date to calendar” button above writes a standard .ics file with a one-day-before alarm — it imports into Google Calendar, Apple Calendar and Outlook without an account or an integration.
Invoice date vs due date vs payment date
| Date | What it means | Where it appears |
|---|---|---|
| Invoice date | The day the document is issued. Payment terms count from here. | On the invoice, beside the number |
| Due date | The last day payment can arrive and still be on time. Derived from the invoice date plus the term. | Printed on the invoice and repeated in reminders |
| Payment date | The day the money actually lands. It can be before or after the due date. | On the receipt and in your reconciliation |
Frequently asked questions
Are invoice payment terms counted in calendar days or working days?+
Calendar days. Net 30 means 30 calendar days after the invoice date, so weekends and public holidays are included. Terms that skip weekends are usually written explicitly as "30 business days" and need a different calculation.
Does the due date start from the invoice date or the date I sent it?+
From the invoice date printed on the document, which is the date the invoice was issued. If you date an invoice Friday but email it the following Wednesday, you have quietly shortened your own terms by five days — date it when you send it.
What happens when the due date falls on a weekend?+
Legally the date stands; commercially most businesses pay on the next working day anyway. If you want a working-day due date, move it forward before you send the invoice and write the resulting date on the document, rather than relying on the client to interpret it.
Is Net 30 the same as 30 days from the end of the month?+
No. Net 30 counts from the invoice date; end-of-month terms (sometimes written EOM) count from the last day of the invoice month. The difference can be almost a month, so never assume — put the actual due date on the invoice.
Can I use a different term for each client?+
Yes, as long as the term is agreed before the work is delivered. Many freelancers use shorter terms for new clients and longer terms for established accounts. The invoice should state the due date, not just the term name.
How do I calculate a due date for a deposit invoice?+
Treat the deposit invoice as its own document with its own issue date. If the balance is invoiced later, it gets its own date and its own term — do not carry the first invoice's clock over to the second.