Freelancer & Small Business

How to Calculate an Invoice Due Date

Use your invoice date and agreed payment terms to calculate when payment is due.

Start with the invoice date

The invoice date is the starting point for many standard payment terms. Record the date consistently so both you and the client are working from the same reference.

Understand common payment terms

Net 7, Net 15, Net 30, Net 45, and Net 60 generally refer to the number of calendar days allowed for payment after the invoice date. “Due on receipt” means payment is requested when the invoice is received.

Calculate the due date

For a simple calendar-day term, add the number of days in the payment term to the invoice date. For example, a Net 30 invoice dated April 1 has a basic due date of May 1.

Check your agreement

Contracts and client agreements can define payment timing differently. Some arrangements use business days, specific dates, milestones, or other rules. Follow the terms you actually agreed to.

Consider weekends and holidays

If a due date falls on a weekend or public holiday, do not automatically assume it moves to the next business day. Check the contract, invoice terms, and applicable rules for your situation.

Keep the due date visible

Putting the due date clearly on the invoice makes payment expectations easier to understand and gives you a consistent date for aging and follow-up.

Use the Invoice Due Date Calculator

Calculate an invoice due date from an invoice date and common payment terms.

This guide explains common invoicing practices. Contract terms, commercial rules, and legal requirements vary by jurisdiction and agreement.