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Invoice Due-Date Calculator

Calculate an invoice due date from an invoice date and payment terms in calendar or working days.

Source: GOV.UK Bank Holidays (opens in a new tab)
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HOW IT WORKS

How the Invoice Due-Date Calculator works

1

Enter the invoice date

Choose the date shown on the invoice.

2

Enter payment terms

Use the agreed number of calendar or working days.

3

See the due date

The calculator adds the selected terms and shows the resulting date.

COMMON QUESTIONS

Frequently asked questions

What does net 30 mean?

It commonly means payment is due 30 days after the invoice date, but contracts can define terms differently.

Can I count working days instead?

Yes. Working-day mode skips weekends and uses the selected UK bank holiday calendar.

Does this determine legally required payment terms?

No. It calculates the date from the terms you enter and does not decide which terms apply to a contract.

Can I use zero-day terms?

Yes. Zero days returns the invoice date itself.

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Source information

Calculation rules or data are based on GOV.UK Bank Holidays (opens in a new tab) where applicable. Always check the linked official guidance for unusual or high-stakes circumstances.