Invoice Due Date Calculator

Work out exactly when a Net 15, 30, 45, 60 or custom-term invoice is due — in calendar or business days, with a reminder date.

days

0 = no reminder

Due date
Tuesday, November 17, 2026
in 30 days
Days until due
30
from today
Send reminder on
Tuesday, November 10, 2026
7 days before due

How to use this invoice due date calculator

Enter the date on your invoice, pick the payment terms from your contract, and choose whether to count in calendar days (the freelancer default) or business days. The calculator shows the exact due date, how many days away it is, and the ideal date to send a payment reminder.

Calendar days vs business days

A Net 30 invoice in calendar days always lands 30 days later, even if that is a Saturday — most clients then pay on Monday. In business days, weekends are skipped entirely, which can push the due date a week later than the calendar version. That difference is worth real money on large invoices, so make sure your contract states which one applies.

Why due dates matter for freelancers

Freelancers have no payroll department chasing their invoices. A clear due date — plus a reminder sent a few days early — is the difference between getting paid in 15 days and getting paid in 60. While you are at it, check what platform fees are silently costing you with the Upwork fee calculator, and confirm your pricing holds up with the freelance rate calculator.

Frequently asked questions

What does Net 30 mean?

Net 30 means the full invoice amount is due 30 days after the invoice date. Net 15, Net 45 and Net 60 follow the same pattern. Unless your contract says otherwise, the count usually runs in calendar days — so a Net 30 invoice dated October 19 is due November 18, 2026.

Should invoice due dates use calendar or business days?

Calendar days is the default convention for freelancers and most B2B invoices — a due date that lands on a weekend simply gets paid the following Monday. Business days are more common in specific industries like construction or procurement. When in doubt, write it in the contract: "Net 30, calendar days."

What is the best payment term for freelancers?

For new clients, Net 15 or due-on-receipt protects your cash flow while Net 30 is the corporate default. Many freelancers offer Net 15 with a 2% early-payment discount. Whatever you choose, put the due date and late-fee policy on the invoice itself.

How do I calculate a due date in business days?

Count working days (Monday–Friday) starting the day after the invoice date, skipping weekends — this calculator does it automatically. A Net 15 invoice dated Monday, October 19, 2026 is due November 9, 2026 in business days.

When should I send an invoice payment reminder?

A friendly reminder 3–7 days before the due date prevents most late payments, and a follow-up on the due date catches the rest. This calculator works out both dates from your invoice date and terms.

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