How to set an invoice due date

What an invoice due date means

The due date is the last day the customer can pay without being late. It turns your payment terms into one specific date, so nobody has to count days or guess what “net 30” means. It is also the date your reminders, any agreed late fees and your cash flow plans all hang from, which is why it belongs on every invoice.

A due date is not the same as the invoice date (the day you issue it) or the supply date (the day you did the work or delivered the goods). All three can be different, and a clear invoice shows each one with its own label.

How to choose a due date

Start with what your contract or quote says. If nothing was agreed, pick a period that suits the size of the job and the type of customer, then tell them before you send the first invoice. Short periods suit small jobs and individuals; larger businesses often pay on a fixed cycle, so ask about it at the start.

Australia’s business.gov.au gives credit periods of 7, 14, 21 or 31 days as examples and notes that offering credit carries a cash flow risk. Questions worth asking yourself:

• Who is the customer? A homeowner can usually pay in a few days. A company may need the invoice approved by a manager and then paid in a weekly or monthly run.
• How big is the amount? A large bill may need a shorter period or staged payments, so you are not carrying the cost for weeks.
• What did you agree? Your quote or contract terms win over anything you write later.
• What can you afford? If you have paid for materials up front, a long wait hurts.

How the due date and payment terms work together

Payment terms are the rule; the due date is the answer. “Net 14” says the customer has 14 days, and the due date applies that rule to a real invoice. Count from the invoice date unless your terms say otherwise, treat the invoice date as day zero, and write the result on the invoice so the rule and the date always agree.

If the two ever conflict, for example “net 30” next to a date only 20 days away, expect the customer to use whichever suits them. Check both before you send.

When no date is agreed at all, some countries fill the gap. In the UK, GOV.UK says that unless you agree a payment date, the customer must pay within 30 days of getting your invoice or the goods or service. Other countries handle this differently, so state a date rather than relying on a default. For the meaning of each common term, including due on receipt and end of month terms, see our guide to payment terms.

Worked examples: from invoice date to due date

The table below takes one invoice dated Tuesday 3 November 2026 and works out the due date under seven common terms. Each count starts the day after the invoice date. Note how two of the results fall on a weekend, and how month based terms ignore the number of days entirely.

Short months matter too. An invoice dated Saturday 30 January 2027 on net 30 is due Monday 1 March 2027, because February 2027 has 28 days. Counting “one month later” instead would give 28 February, which is a different date.

How to write the invoice due date so nobody misreads it

Write the month as a word and the year in full: “Due 3 December 2026” or “Due December 3, 2026”. A numeric date such as 12/03/2026 reads as 12 March in much of the world and December 3 in the United States, and that ambiguity is easy to avoid. Place the date beside the total, where the eye lands first.

Good places to show it:

• In the invoice header, labelled “Due date”, next to the invoice number and issue date.
• In the payment block under the total: “Amount due $1,850.00 by 3 December 2026”.
• In the email subject and first line. Our invoice email templates show how.

The invoice generator works out the due date from the issue date when you choose a number of days or due on receipt, and prints dates with the month as a word. Billing American customers? Start from the US preset, which writes the month first.

Weekends, holidays and customer pay runs

A due date can land on a weekend or a public holiday, as net 60 does in the table above. You can leave it, since many people pay online on any day, or choose a working day yourself. The clean way is to pick the date first, then write that date, rather than writing a term and hoping the client counts the same way.

Two habits help here:

• Ask about pay runs. If a client pays suppliers every second Thursday, a due date just after a run means you wait two weeks. Time your invoice so it is approved before the run.
• Watch holiday periods. Offices that close over the end of year break may not approve invoices for a while. Send earlier, or agree a date after they reopen.

Changing or extending a due date

If a customer asks for more time and you agree, confirm the new date in writing and keep the original invoice number. You do not need a new invoice just to move a date; a short email that says “Invoice 2026-118 is now due 15 December 2026” is enough for most records. Change the invoice itself only if you are fixing a mistake.

If the amount was wrong, that is a different job: issue a credit note or a corrected invoice, depending on your tax rules. If the date passes without payment and no extension was agreed, move to a polite reminder. Our plan for following up an unpaid invoice sets out what to send and when, and the guide to late payment fees covers what you can charge if your terms allow it.