Invoice due date calculator
This invoice due date calculator finds the date an invoice is due: enter the invoice date and the payment term in days, count from the end of the month if you like, move the result to the next business day and get the discount date too.
Source: Europäische Kommission – Late payment (Richtlinie 2011/7/EU: businesses pay within 60 days, unless expressly agreed otherwise and not grossly unfair). Updated: .
How it is calculated
An invoice dated October 1, 2026 with a 30-day payment term is due on October 31, 2026 – a Saturday. The invoice due date calculator gives the date with the weekday and can move it to the next business day.
How it is calculated
- Standard: invoice date + payment term in calendar days.
- From month end: the term only starts on the last day of the invoice month, for example “30 days after end of month”.
- Business day: if the result falls on a Saturday or Sunday it can be moved to the following Monday.
- Discount: the discount date uses the same start-day rule but the shorter discount period.
What the law says
Payment terms are agreed in the contract. Under the EU late payment directive 2011/7/EU, businesses have to pay invoices within 60 days unless they expressly agree otherwise and it is not grossly unfair. Exact implementation and the start of the term depend on the law of your country and your agreement; the calculator is not legal advice.
Next steps: the cash discount calculator, create an invoice, a payment reminder and the date calculator.
Frequently asked questions
How do I calculate an invoice's due date?
Invoice date plus the payment term in calendar days. An invoice dated October 1 with 30 days is due on October 31.
What does 30 days after month end mean?
The term does not start on the invoice date but on the last day of the month. An invoice dated October 14 is then due on November 30.
What if the due date falls on a weekend?
Choose “Move to the next business day” and a Saturday or Sunday becomes the following Monday. Whether such a shift applies depends on your agreement.
How long may a payment term be?
Under EU Directive 2011/7/EU 60 days between businesses, unless expressly agreed otherwise and not grossly unfair. Public authorities have shorter limits.
How do I include an early-payment discount?
Enter the discount period in days, for example 10. The calculator shows the date until which the deduction is possible; the cash discount calculator works out the amount.
Sources and legal basis
As of: · Editorial policy
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