Why "Net 30" Is a Polite Suggestion and How to Get Paid in 10

"Net 30" is the most optimistic phrase in small business. It reads like a deadline; it functions like a wish. You write it on the invoice, the customer reads it as "sometime next month," and your money sits in someone else's bank account earning someone else's interest. The terms you printed and the terms you actually get paid on are two different numbers, and the gap between them is the most expensive thing on your books.

Start with the number that should bother you. Across small B2B service businesses, days sales outstanding — DSO, the average time from invoice to cash — commonly runs around 27 days. That sounds fine until you remember you wrote "net 30" expecting 30, and the average is already eating most of it — which means half your invoices land well past it. You are, on average, an unsecured short-term lender to every customer you have. You just didn't sign up to be a bank.

What the gap costs a real shop

Take a $500K/yr machine shop carrying $40K in receivables at any given moment. That $40K isn't profit you're waiting on — it's working capital you've already spent. You bought the bar stock, ran the machines, paid the operator, and shipped the part. The cash went out weeks ago; the cash coming back is stuck in net-30-that's-really-net-45 limbo.

Here's the lever. If that shop cuts its average collection time from 38 days to 18 — half-deposits up front, shorter terms, faster invoicing — the receivables balance roughly halves. Call it $20K freed up: $20K you're no longer financing out of your own pocket. At a 9% line-of-credit rate, you were paying around $1,800 a year in interest just to float customers who could've paid sooner. More to the point, that $20K is a down payment on a new machine, a second operator, or simply not sweating payroll the week a big customer pays slow. None of that required charging more or winning more work. It came from the cash cycle, not the cash amount. I wrote about why that 27-day number is structurally broken in The 27-Day Problem.

Get money before the work, not after

The highest-leverage move is also the oldest: don't do the whole job on credit. Deposits and milestone billing flip the financing relationship — instead of you funding the customer's project and hoping they pay, the customer funds the work as it happens.

• Deposit on acceptance. 30–50% due before you cut a chip or pull a permit. For custom fab and machining, this is industry-normal. If they blink, that's information about whether they'll pay the back half.
• Milestone billing on longer jobs. Split anything over a few weeks into progress payments — material delivered, halfway, completion. You're never more than one milestone underwater.
• Final balance on delivery, not after. "Balance due on delivery" means the truck doesn't leave until the wire clears.

Invoice same-day, shorten the terms, remove the friction

Your DSO clock doesn't start when the work is done. It starts when the invoice lands in their inbox. Finish a job Tuesday and invoice the following Monday, and you just added six days to every payment, for no reason, forever. Invoice the moment the customer signs off: the clock starts sooner and the job is still fresh — they remember the value, the approval is still warm. It's the cheapest cash-flow lever there is, and almost nobody pulls it consistently. I broke down the mechanics in Same-Day Invoicing.

Then shorten the terms. "Net 30" is a default, not a law of physics. The number you write anchors when they pay — a customer who pays at terms-plus-ten lands on day 40 at net 30 and day 20 at net 10. Same customer, same behavior, twenty days of your cash. You don't need everyone to pay on time; you need to move the anchor.

And remove the friction. If paying you means cutting a paper check, finding a stamp, and remembering to mail it, you've built a three-step obstacle course between you and your money. Card-on-file or ACH authorization at the deposit stage means the final balance gets charged the moment the job's done. Yes, card processing costs 2.9% — but getting paid in 3 days instead of 45 is worth a lot more than that to a shop floating its own receivables on a credit line at three times the rate.

Make follow-up automatic, not awkward

Most late invoices aren't refusals. They're an email that got buried, an AP clerk who needs one nudge. The owner who never follows up isn't being polite — they're being expensive. The fix is a cadence that runs without you deciding to run it: a friendly reminder at day 3, another at terms, another past due. Not threatening — just present. The customer juggling forty payables pays the vendor who's actually paying attention.

This is the part I build Setell to run. It drafts the quote, syncs the invoice to QuickBooks when the job's accepted, and follows up on the schedule you set — so the invoice goes out same-day instead of next-week, and the nudge happens whether or not you remembered. You set the autonomy: Watch mode approves every send; Trust and Auto hand off the routine ones.

Before any of it, run the audit on your own numbers. Pull your last 90 days of paid invoices and calculate the real gap between invoice date and payment date — not what your terms say, what actually happened. Most owners think they're at net 30 and they're at net 44. For a structured way to run the full diagnostic across deposits, invoicing speed, terms, and collections, the Cash Cycle Scorecard walks through it free.

None of this is clever. Deposits, same-day invoices, shorter terms, payment on file, automatic follow-up — these are the boring mechanics of not being your customers' bank. "Net 30" will keep being a polite suggestion no matter what you do. The point is to stop building your cash flow around the assumption that they'll honor it.

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