Net 30 payment terms: what they mean and how to enforce them
By The AR Agent team · · 9 min read
Net 30 payment terms mean the customer must pay the full invoice amount within 30 days. Unless your terms say otherwise, the 30 days are usually counted as calendar days from the invoice date, so an invoice dated March 10 on Net 30 is due on April 9. "Net" means the full amount, with no discount for paying early.
Net 30 is easy to write and easy to ignore. Enforcing it comes down to three things: agreeing the terms before the work starts, putting a real date on every invoice, and following up the day after that date passes.
What Net 30 means, in plain terms
Payment terms tell the customer how long they have to pay. The common ones:
Term
What it means
Due on receipt
Pay as soon as the invoice arrives
Net 7, Net 15
Full amount due within 7 or 15 days
Net 30
Full amount due within 30 days
Net 60, Net 90
Full amount due within 60 or 90 days
Net 30 EOM
Full amount due 30 days after the end of the month the invoice is dated
2/10 Net 30
A 2% discount if paid within 10 days, otherwise the full amount within 30
The word "net" refers to the amount, not the timing. It means the total on the invoice, without any deduction. That is why early payment discount terms like 2/10 Net 30 add a second number in front.
In the UK, the same idea is often written as "30 days" or "payment within 30 days of invoice", and chasing late payers is usually called credit control.
How to calculate a Net 30 due date
Count 30 calendar days from the invoice date. Weekends and public holidays count.
Say an agency sends an invoice dated March 10 on Net 30. March has 31 days, so 21 days take it to March 31, and 9 more reach April 9. The invoice is due April 9 and is overdue from April 10.
Two details cause most disagreements:
Invoice date or receipt date. Some customers count from the day the invoice reached them, or the day they approved it, rather than the date printed on it. Your terms should say which applies. "Payment is due 30 days from the invoice date" removes the question.
End of month terms. Under Net 30 EOM, the 30 days start at the end of the month the invoice is dated. The same March 10 invoice would be due April 30. Some large customers use this by default, which can add weeks to what you expected.
Also check that the invoice date and the send date match. An invoice dated the 1st but sent on the 9th has already lost eight days, and the customer will usually count from when it arrived.
Is Net 30 right for your business?
Net 30 is a common default for business-to-business work. That does not make it right for every job.
Consider shorter terms, or a deposit, when:
The job is large compared with your monthly revenue, and waiting a month for it would strain your own payroll or suppliers.
You are paying for materials or subcontractors up front.
The customer is new and has no payment history with you.
The work runs for weeks, in which case stage or progress billing keeps any single unpaid amount smaller.
Longer terms, like Net 45 or Net 60, are sometimes the price of working with a large customer. Our guide to Net 60 payment terms covers what to ask for in return, and when Net 15 is the better choice. If you accept them, price the job knowing you will wait, and watch the effect on your days sales outstanding and accounts receivable turnover ratio.
How to set Net 30 terms so they hold
Most late payment on Net 30 is not refusal. It is an invoice that did not meet the customer's process, or terms that were never clearly agreed.
Put the terms in writing before the work starts
The first time a customer sees your payment terms should not be on the invoice. Put them in the quote, proposal, statement of work or contract, and get the customer to accept that document. If the customer's own purchase terms say something different, settle which applies now, not when the invoice is late.
Wording you can use in a quote or contract:
Payment terms: Net 30. Payment is due in full within 30 days of the
invoice date, by [Payment method] to [Bank details or payment link].
Invoices will be sent to [Customer AP email]. Please tell us before
work starts if a purchase order number or supplier setup is needed
for invoices to be paid.
[Late payment terms, if any: e.g. "Overdue balances may be charged
[Rate or fee], as permitted by applicable law."]
Only include a late fee or interest line if you intend to apply it and it is allowed where you trade. The rules differ by country, and in the US by state and by contract. Our guides to late fees on invoices in the US and late payment interest in the UK set out the general position.
Ask how their accounts payable process works
A short question at the start saves weeks later:
Subject: Invoicing details for [Project name]
Hi [First name],
Before we send our first invoice, could you confirm:
- who invoices should be sent to
- whether you need a purchase order number on each invoice
- whether we need to be set up as a supplier first, and how
- the days your payment runs happen
Our terms are Net 30 from the invoice date, as agreed in [Quote or
contract reference].
Thanks,
[Your name]
If their payment run happens on the 15th and 30th, an invoice due on the 16th will probably be paid on the 30th.
Put the due date on every invoice
Write "Due date: April 9" as well as "Terms: Net 30". The customer's team should not have to calculate anything. Include the PO number if they use one, a clear invoice number, what the work was, and how to pay. Our guide to invoice terms and conditions has a terms block you can copy.
Invoice as soon as the work is done
The 30 days do not start until the invoice is dated and sent. Every day between finishing the work and sending the invoice is a day added to your wait. If your team works on customer sites, our guide to HVAC and field service invoices covers what to capture before the technician leaves.
How to enforce Net 30 terms
A simple routine for a Net 30 invoice:
When
What to send
A few days before the due date
A short reminder with the amount, due date and payment details
The day after the due date
A polite note that the invoice is now overdue, asking when it will be paid
About 7 days overdue
A firmer follow-up asking for a payment date, and checking for any problem with the invoice
About 14 to 30 days overdue
Escalate to a senior contact or the person who approved the work
Get a date, not a promise. "We'll pay soon" is not a commitment. Ask for the day, then follow up the day after if it does not arrive.
Find the blocker. A missing PO, the wrong contact or a query about one line can hold up the whole invoice. Ask directly whether anything is stopping payment.
Pause new work. If a customer is well past terms, it is reasonable to ask for the balance to be cleared, or for new work to be paid up front, before you start the next job. Say so calmly and in advance.
Apply late fees only if agreed. If your terms include them and they are lawful where you trade, apply them consistently. If you do not intend to charge them, do not mention them.
Review the terms for repeat late payers. A customer who agrees to Net 30 and always pays at 60 days may need shorter terms, a deposit or staged billing on the next job.
When a customer asks for longer terms
Large customers sometimes reply to your Net 30 invoice with "our standard terms are 60 days". Treat it as a negotiation, not a fact.
Point to what was agreed: "Our quote, accepted on [Date], set Net 30 terms."
If you are willing to accept longer terms for future work, agree them for future invoices and keep the current invoice on what was agreed.
If you accept longer terms, consider what you get in return: a larger deposit, staged billing, or a price that reflects the wait.
Frequently asked questions
Does Net 30 include weekends?
Usually yes. Unless the terms say "business days" or "working days", Net 30 means 30 calendar days, so weekends and public holidays count. If the due date falls on a weekend, many customers pay on the next working day. If that matters to you, put the exact due date on the invoice and say how you treat weekends in your terms.
Does Net 30 start from the invoice date or when the customer receives it?
It starts from whatever your agreed terms say. Most suppliers count from the invoice date, but some customers count from receipt or approval. Avoid the argument by writing "30 days from the invoice date" in your terms, showing the due date on the invoice, and sending the invoice the day it is dated.
What is the difference between Net 30 and due in 30 days?
In practice, very little. Both mean the full amount is due within 30 days. "Net" simply makes clear that no discount applies. Whichever you use, add the actual due date to the invoice so there is no doubt about the day payment is expected.
Can I charge a late fee on a Net 30 invoice?
Possibly, depending on where you trade and what was agreed. In the US the rules vary by state and by contract, so check before adding a fee. In the UK, businesses have a statutory right to claim interest and compensation on late commercial payments, which our UK late payment interest guide explains. Either way, the fee should be in your terms before the invoice is sent.
What should I do when a Net 30 invoice is overdue?
Follow up the day after the due date and ask when it will be paid. Check that the invoice reached the right person and has everything their team needs, such as a PO number. If it stays unpaid, escalate in steps: a firmer email, a senior contact, then a final notice. Our guide to collecting unpaid invoices covers each step.
How The AR Agent handles this
The AR Agent follows up overdue invoices by email, at the right time for each customer, using the due dates already in QuickBooks or Xero. It reads what customers write back. If a reply says the invoice is missing a PO, has gone to the wrong contact, or is being queried, it identifies that blocker instead of sending another reminder. When a customer says "we'll pay Friday", that becomes a tracked payment promise with an automatic next step, and it follows up if the date passes. When a reply needs a judgement, such as a request for longer terms, it asks your team. Every email and promise is kept on the customer's record.
None. This guide uses invented examples and contains no statistics. Legal points are general information only; the linked US and UK guides cite their official sources.