Net 15 Payment Terms: Meaning, When to Use Them, and Wording

Net 15 means full payment is due within 15 calendar days of the invoice date. Invoice issued August 20 → payment due September 4. It's the middle option on the payment-terms spectrum: twice as fast as the corporate-default Net 30, but with more breathing room than due upon receipt.

This article covers exactly how Net 15 works, who it's right for, and how to introduce it without friction. For the full landscape of terms, see invoice payment terms — and copy-paste wording for common scenarios in invoice payment terms examples.

How Net 15 works

The clock starts on the invoice date — not the date the client opens the email, not the end of the month. (A rarer variant, "Net 15 EOM," counts from end of month; if you don't mean that, don't write it.)
Days are calendar days, weekends and holidays included. If day 15 lands on a Sunday, expect payment the next business day — pragmatically, not contractually.
"Net" means the full remaining balance — the whole invoice amount after any deposit already paid, with no discount attached.

On the invoice, state the term and the computed date, so nobody does the math wrong:

Terms: Net 15 — payment due September 4, 2026.

A discount variant exists here too: 2/10 Net 15 means "2% off if paid within 10 days, otherwise full amount in 15." With a window that short, the discount buys you little — early payment discounts make more sense against Net 30+.

Net 15 vs the alternatives

| Term | Payment due | Typical use | |---|---|---| | Due upon receipt | Immediately (in practice: a few days) | Small amounts, first-time clients, consumer work | | Net 15 | 15 days from invoice date | Freelancers and small businesses billing SMB clients | | Net 30 | 30 days from invoice date | B2B default; what corporate AP expects | | Net 60/90 | 60–90 days | Large enterprise buyers; hard on your cash flow |

The honest framing: Net 30 is the default your client's AP process was built around; Net 15 is a deliberate choice you make for cash flow. Small clients and direct-owner relationships absorb Net 15 easily. Enterprise AP departments, which run payment cycles on fixed schedules, often can't honor it even with goodwill — an invoice marked Net 15 simply gets paid on their next Net-30-style run.

When Net 15 is the right call

You're a freelancer or small business and cash flow is the constraint. Fifteen days shaves half the waiting off every invoice, permanently. Across a year of monthly invoices, that's roughly two extra weeks of working capital at all times.
Your clients are small businesses or individuals where a human, not an AP system, pays the bill.
The invoice amounts are modest. Clients accept short terms on a $900 invoice far more readily than on a $40,000 one.
You bill frequently. Weekly or biweekly billing pairs naturally with short terms; Net 30 on a weekly invoice means four invoices are always outstanding.
A client has been chronically late on Net 30. Moving them to Net 15 with a stated late fee resets the norm — they may still pay in 25 days, but that beats 45.

When it's the wrong call: enterprise clients with fixed AP cycles (you'll create friction without getting paid faster — take Net 30 and invoice promptly instead), and industries where longer terms are entrenched.

How to introduce Net 15 without friction

Set it before work starts, not on the first invoice. Terms that first appear on an invoice are a surprise; surprises get negotiated late and badly. Put "Payment terms: Net 15" in your proposal or contract, next to the price. (Where the rest of your terms block goes is covered in invoice terms and conditions.)
State it as your standard, because it is. "My standard terms are Net 15" lands differently than "would Net 15 be okay?" Clients accept standards; they negotiate requests.
Print the due date on every invoice. "Due September 4, 2026" — computed, explicit, next to the total. The invoice generator does the date math from your term automatically.
Pair it with easy payment. Short terms plus a payment link is a fair ask. Short terms plus "mail a check" is not — the postal float eats half the window.
Follow up on schedule. A term you never enforce drifts back to Net 30 within a quarter. Send a reminder a few days before the due date, and start the follow-up sequence the day after it passes.

If a valued client pushes back, the standard compromise ladder: Net 15 for months 1–3, then Net 30 once trust is built — or Net 30 with a deposit upfront, which protects cash flow from the other end.

What Net 15 does to your cash flow — a concrete picture

Say you invoice $6,000/month, spread over two invoices:

On Net 30 (with the realistic 5–10 day drift): money arrives 35–40 days after the work. You permanently float more than a month of income.
On Net 15 (same drift): money arrives 20–25 days after the work. The float drops by roughly $3,000 — cash that's in your account instead of your clients'.

The improvement compounds with billing frequency: moving from monthly/Net 30 to biweekly/Net 15 roughly triples how fast work converts to cash, with no change in what you earn. That combination — not chasing harder, just shortening the pipe — is the cheapest cash-flow fix available to a small business. (If even Net 15 is too slow because a client insists on long terms, the financing route is invoice factoring — but it costs margin; shorter terms are free.)

FAQ

What does Net 15 mean on an invoice?

The full invoice balance is due within 15 calendar days of the invoice date. Invoice dated August 20 → due September 4. It's a promise-to-pay window, not a suggestion — after day 15 the invoice is overdue.

Does Net 15 count weekends?

Yes — calendar days, not business days. If the 15th day falls on a weekend or holiday, payment on the next business day is the accepted convention. If you want business days, you'd have to write "15 business days," which nobody does — pick Net 21 instead.

Is Net 15 rude or unprofessional to ask for?

No. It's a standard commercial term used across freelancing and small-business billing. What reads as unprofessional is springing it on a client after the work is done — set it in the proposal, apply it consistently, and it's simply your standard.

When does the Net 15 clock start — invoice date or delivery date?

The invoice date, by convention. This is why invoicing promptly matters: work delivered August 1 but invoiced August 20 is effectively on Net 34. Send the invoice the day you deliver — the full process is here.

Net 15 or due upon receipt — which should I pick?

Due upon receipt for small amounts, one-off consumer work, or first engagements with unknown clients. Net 15 when you're billing businesses regularly — it gives their process room to run while keeping the wait short. In practice both often result in payment within 1–2 weeks; Net 15 just sets a defensible written deadline.

Can I charge a late fee on a Net 15 invoice?

Yes — same rules as any term: the fee (commonly 1.5%/month) must be stated on the invoice and agreed before the engagement. With short terms, apply grace judiciously: a fee triggered on day 16 for a client who pays on day 18 burns goodwill over pennies. Mechanics in how to charge late fees.

What's the most common payment term for freelancers?

Net 30 remains the most common because it's the corporate default, but Net 15 is the most commonly recommended for freelancers billing small clients — and due upon receipt dominates for small one-off jobs. The decision framework across all of them: invoice payment terms.