Net 30 Calculator
Enter your invoice date and get the Net 30 due date plus a full reminder schedule for follow-up emails.
How It Works
The Net 30 Calculator is a focused tool that takes your invoice date and instantly computes the payment due date 30 calendar days later. But it goes beyond a simple date calculation. It generates a complete follow-up reminder schedule to help you get paid on time. The schedule includes a 7-day reminder, a 3-day reminder, a due-date reminder, and an overdue follow-up date for invoices that go past due.
Net 30 is the most widely adopted payment term in business. It means the buyer has 30 calendar days from the invoice date to pay the full amount owed. This term applies to calendar days, not business days, so weekends and holidays are included in the count. The simplicity and universality of Net 30 make it the default choice for most B2B transactions worldwide.
Formula
Due Date = Invoice Date + 30 calendar days
7-Day Reminder = Invoice Date + 23 days
3-Day Reminder = Invoice Date + 27 days
Due Date Reminder = Invoice Date + 30 days
Overdue Follow-Up = Invoice Date + 37 days
Why Reminder Schedules Help You Get Paid on Time
Research shows that businesses that send payment reminders before the due date get paid significantly faster than those that wait until an invoice is overdue. A structured follow-up schedule removes the guesswork and ensures that payment stays top of mind for your clients. The reminder schedule generated by this calculator is based on best practices used by accounts receivable professionals across industries.
The 7-day reminder serves as an initial heads-up. It is a friendly, professional nudge that lets the client know the payment date is approaching. Many businesses automate this email as part of their invoicing workflow. The 3-day reminder is a more urgent follow-up, giving the client a final window to process the payment before it becomes due. The due-date reminder is sent on the day the invoice is due, confirming the expectation. Finally, the overdue follow-up at 7 days past due initiates the collections process with a firmer tone.
Best Practices for Invoice Follow-Up
- Be polite and professional. Most late payments are not intentional. A friendly tone preserves the business relationship and encourages prompt payment.
- Include invoice details in every reminder. Always reference the invoice number, amount, and due date so the client can locate the invoice quickly.
- Use multiple communication channels. If email reminders are not getting a response, follow up with a phone call or a message through your project management platform.
- Document everything. Keep records of all communications related to payment. This is important if the situation escalates to a formal dispute or collections process.
- Set clear terms upfront. The best way to avoid late payments is to establish clear payment terms in your contract before work begins. Include details about late fees, grace periods, and the consequences of non-payment.
Examples
Example 1: Invoice dated January 1
If you issue an invoice on January 1 with Net 30 terms, the due date is January 31. Your 7-day reminder should go out on January 24, the 3-day reminder on January 28, and the overdue follow-up on February 7 if payment has not been received.
Example 2: Invoice dated March 15
An invoice dated March 15 is due on April 14. Send the first reminder on April 7 (7 days before), the second on April 11 (3 days before), and an overdue follow-up on April 21 if needed.
Example 3: Invoice dated October 20
An invoice issued on October 20 has a Net 30 due date of November 19. The 7-day reminder falls on November 12, the 3-day reminder on November 16, and the overdue notice would go out on November 26.
Net30 vs Net 30 — Same Term, Different Spelling
"Net30" (one word) and "Net 30" (two words) are the same invoicing term — full payment due 30 calendar days from the invoice date. The U.S. Small Business Administration uses the spaced form "Net 30" in its official small-business finance guidance, but freelance and B2B invoicing software (FreshBooks, QuickBooks, Wave, Stripe) accepts both. Pick one form per contract and stay consistent — mixing styles in the same agreement creates ambiguity if a dispute reaches court. The 30-day count is identical either way: weekends and public holidays included, starting from the invoice issue date. Updated 2026-05-31.
Frequently Asked Questions
What is Net 30?
Net 30 is a payment term that means the full invoice amount is due within 30 calendar days from the date the invoice is issued. It is the most common payment term in business-to-business (B2B) transactions. The "Net" refers to the total amount owed, and "30" is the number of calendar days the buyer has to pay.
Does Net 30 include weekends and holidays?
Yes. Net 30 is calculated using calendar days, which means weekends, public holidays, and non-working days are all included in the 30-day count. If the due date falls on a weekend or holiday, payment is typically expected on the next business day, though the contractual obligation remains on the calculated date.
What is the difference between Net 30 and "due in 30 days"?
In most cases, Net 30 and "due in 30 days" mean the same thing: full payment is expected 30 calendar days after the invoice date. However, Net 30 is the standard business terminology and may carry additional implications in formal contracts, such as triggering late fee clauses or early payment discounts (e.g., 2/10 Net 30 means a 2% discount if paid within 10 days).
When should I send payment reminders for a Net 30 invoice?
Best practice is to send reminders at three key intervals: 7 days before the due date (a friendly heads-up), 3 days before (an urgent reminder), and on the due date itself (a final confirmation). If payment is not received, send an overdue notice 7 days after the due date. This structured approach significantly improves collection rates and maintains professional relationships.
What if a client does not pay by the Net 30 due date?
If a client misses the Net 30 deadline, start by sending a polite overdue notice referencing the invoice number and amount. Follow up with a phone call if there is no response within a few days. If your contract includes a late fee clause, notify the client that late fees will begin accruing. For persistently overdue invoices, consider engaging a collections agency or seeking legal counsel. Throughout the process, maintain documentation of all communications.
Is "net30 calculator" the same as a Net 30 calculator?
Yes — "net30" (no space) and "Net 30" (with space) are spelling variants of the same B2B payment term. Both mean payment is due 30 calendar days from the invoice date. This calculator handles either form: enter the invoice date and you get the due date plus a reminder schedule, regardless of how the term is written in your contract.
How is Net 30 different from "End of Month" (EOM) terms?
Net 30 counts 30 calendar days from the invoice date. "Net 30 EOM" (end of month) counts 30 days from the last day of the invoice month — so an invoice dated 5 March under EOM is due 30 April, not 4 April. Always check whether your contract specifies EOM, because the two terms can shift the due date by up to 30 days.