Free tool
Invoice due date calculator
Pick a start date and add days or months. Instantly see the due date with its weekday, how many days are left from today and whether it falls on a weekend.
Due date
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- From today
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- Period
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Calendar days are counted. Weekends are flagged; public holidays are not.
In short
An invoice's due date is the issue date plus the calendar days of the payment term: an invoice dated 15 January on 30-day terms is due on 14 February. When the term is in months, the due date falls on the same day of the month, or on the month's last day if that day does not exist (31 January + 1 month = 28 or 29 February).
- Common payment terms
- 30, 60, 90, 120 days
- Counting
- Calendar days
- Months
- Same day, or the month's last day
- Weekends
- Flagged, with the next working day
How it works
How to calculate a due date
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Pick the start date
Usually the invoice issue date. It defaults to today.
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Choose days or months
Type the number or pick a common term: 30, 60, 90, 120 days or 1, 3, 6, 12 months.
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See the due date
With the weekday, the days left and a warning if it falls on a Saturday or Sunday.
How do I work out when a 30-day invoice is due?
Add 30 calendar days to the issue date. An invoice dated 1 March is due on 31 March; one dated 15 January is due on 14 February.
Does the issue date count as day one?
The calculator starts counting from the next day: "in 30 days" from 1 March is 31 March. If your contract says otherwise, adjust the number of days.
Are 30 days the same as 1 month?
Not always. 30 days is a fixed period, while a month ends on the same day of the next month. From 1 February, 30 days reach 3 March (2 March in a leap year), while 1 month reaches 1 March.
What if the due date falls on a weekend?
The calculator flags it and shows the next working day. Whether the payment moves depends on your agreement. Public holidays are not taken into account.
Does eFluper track overdue payments?
Yes. In eFluper you see outstanding balances per customer, record payments and can send payment reminders to your customers.
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Always know who owes you, and since when
Payments, outstanding balances and payment reminders with eFluper. Start for free.