Net 30 is a 30-day window to pay an invoice after you send it

Net 30 means the person or business you invoice has 30 calendar days from the invoice date to pay you. The clock starts the day you issue the invoice, not the day they receive it. If you invoice on January 1st, payment is due by January 31st. That's the entire agreement — nothing more complex than that.

This is one of the most common payment terms in small business and freelance work because it gives the buyer time to process the invoice through their accounting system without being unreasonable about how long you wait. It's also standard enough that most accounting software handles it automatically.

Key Takeaways

  • Net 30 means payment is due 30 calendar days from the invoice date, regardless of when the buyer receives or opens the invoice.
  • The invoice date is what matters for calculating the due date, not the delivery date or the date work was completed.
  • Late payment after day 30 is technically a breach of the agreed terms, though enforcement depends on what your contract says.
  • You can offer incentives for early payment (like Net 15 or 2/10 Net 30) or charge interest for late payment, but these must be stated on the invoice.

How the 30-day clock actually works

The 30 days begin on the invoice date you write at the top of the invoice, not on the date the invoice arrives in someone's inbox. This matters because email delays, mail delays, or the buyer's slow processing don't extend the important date. If your invoice says January 1st, the due date is January 31st, period.

Some businesses use different counting methods. "Net 30" typically means 30 calendar days (so January 1 to January 31). Some older systems use "30 days from end of month" (EOM), which means if you invoice on January 15th, the 30 days start February 1st. Always state which method you use on your invoice to avoid confusion.

Weekends and holidays do not pause the clock. If day 30 falls on a Saturday, payment is still due that day, though most businesses will accept payment on the following Monday without penalty.

What happens if payment arrives late

If someone pays you on day 35, they have technically violated the Net 30 terms. Whether that matters depends on what your invoice says and what your contract with them says. If your invoice includes nothing about late payment, you have limited recourse beyond asking for the money.

To protect yourself, add a late payment clause to your invoices. Common options include charging interest (often 1.5% per month or whatever your state allows), charging a flat late fee, or stating that payment after day 30 is considered a breach of contract. Make sure this language appears on every invoice so the buyer sees it before they agree to the terms.

If a client consistently pays late, you can switch to Net 15, Net 10, or even require payment upfront before you deliver work. You can also require a deposit and invoice the remainder after completion. These are all legitimate business decisions.

Variations on Net 30 and what they mean

Other payment terms you might see use the same logic but with different numbers or conditions:

  • Net 15: Payment due 15 days from invoice date. Faster for you, tighter for the buyer.
  • Net 60 or Net 90: Payment due 60 or 90 days out. Common for larger B2B transactions or government contracts. Slower for you.
  • 2/10 Net 30: The buyer gets a 2% discount if they pay within 10 days; otherwise, full payment is due by day 30. This incentivizes early payment.
  • Due on Receipt: Payment is due when ready when the invoice is issued. No grace period.
  • Prepayment or COD (Cash on Delivery): Payment before work begins or before goods ship.

You choose which terms to offer based on your cash flow needs, your relationship with the buyer, and what's standard in your industry. Freelancers and small vendors often use Net 15 or Net 30. Larger companies often negotiate Net 60 or Net 90 because they process invoices in batches.

How to state Net 30 on your invoice

Your invoice should include a line that clearly states the payment terms. Common placements are near the due date box or in a "Terms" section at the bottom. Write it plainly: "Payment Terms: Net 30" or "Due Date: 30 days from invoice date."

If you're using accounting software like QuickBooks, FreshBooks, or Wave, you can set Net 30 as your default, and the software will calculate the due date automatically. If you're using a template or sending invoices manually, calculate the due date yourself and write it in the "Due Date" field so there's no ambiguity.

Include your payment method instructions on the invoice too — bank transfer details, check mailing address, payment app links, or credit card information. The easier you make it to pay, the faster you'll get paid.

When Net 30 doesn't work for your situation

Net 30 assumes you can afford to wait a month for money. If you can't — because you have payroll, material costs, or rent due before day 30 — you have options. You can require a deposit upfront (often 25% to 50% of the total), invoice in stages as work progresses, or use a shorter payment term like Net 15 or Net 10.

Some businesses use invoice factoring or a line of credit to cover the gap. With factoring, a third party buys your unpaid invoices at a discount and pays you when ready; you lose a percentage but get cash now. This is common in construction, staffing, and B2B services where Net 30, Net 60, or Net 90 is standard but your own bills can't wait.

If you're working with a new client or someone with a reputation for slow payment, you can also require payment upfront or use a shorter term until they prove reliable. There's no rule that says you must offer Net 30 to everyone.

Frequently Asked Questions

Does Net 30 start from when they receive the invoice or when I send it?

It starts from the invoice date you write on the invoice, not from when it arrives. If your invoice is dated January 1st, the 30 days begin January 1st, even if the buyer doesn't open their email until January 5th. This is why it's important to issue invoices promptly after completing work.

Can I charge interest or a fee if someone pays after day 30?

Yes, but only if you state it on the invoice before they agree to the terms. Common options are 1.5% monthly interest, a flat fee (like $25), or a percentage of the invoice amount. Check your state's laws on maximum interest rates — they vary. Always disclose the late fee upfront so there's no dispute later.

What if my client says they can only pay Net 60?

You can negotiate. You might accept Net 60 if they're a large, reliable client, but require a deposit upfront to cover your costs in the meantime. Or you can hold firm on Net 30 and let them decide whether to work with you on those terms. It's a business decision based on your cash flow and the value of the client.

Is Net 30 legally binding?

Only if it's part of a signed contract or if the invoice itself is accepted as an agreement. In most cases, sending an invoice with Net 30 terms and the buyer paying it means they've accepted those terms. If payment is late and you want to pursue it legally, you'll need to show the invoice and prove the due date. Having clear terms on every invoice makes this easier.

What's the difference between Net 30 and 30 days from end of month?

Net 30 means 30 calendar days from the invoice date. "30 days from end of month" (EOM) means the 30 days start on the first day of the next month. If you invoice on January 15th with Net 30, payment is due February 14th. With EOM, payment is due March 2nd. Always specify which one you use to avoid confusion.