Make Your Supplier Your Bank — Without Owing Them

The problem in one breath

Every supplier will hand you material now and bill you later. That's a real tool for smoothing out cash — or a slow trap that turns into a balance you can't clear and a supplier who won't load your truck. Same account, two very different endings. The difference is whether you know which kind of owner you are.

Why it happens

Net-30 feels free. You drive off with three squares of shingles and an underlayment order, and nobody asks for a dime for thirty days. So it's easy to keep charging — this job, that job, the warehouse run for the crew — and let the balance ride. Then the statement lands, it's bigger than you pictured, this month's deposits are already spent on last month's material, and now you're carrying a balance you're paying off with the next job's money. Meanwhile material is the biggest line in your job cost (Play 06), so it's the fastest account to balloon. Nobody set out to run a tab. It just never got paid down.

The play

Keep the credit, keep the discipline. Decide up front how you'll use these lines instead of letting the balance decide for you.

1. Open a line with every major supplier in town — not just one. Terms you negotiate, not terms you're stuck with. The point isn't only the credit; it's that a stockout or a screw-up at one supplier never stops your job. Short a bundle at supplier A on a Tuesday tear-off? You pull from B and keep the crew on the roof. Being spread across all of them is leverage. One thing to know before you sign four of them: read what the credit application says about who guarantees the balance — on a shop your size it's usually you, personally, corporation or not. This play is the credit side of that account. What the account is worth on the buying side — your price, delivery, returns — is a different sit-down (Module 15, Play 4).
2. Know which owner you are — cash-flusher or tight. Be honest. If you've got a real cash reserve behind you (Play 11), you can treat these lines like cash accounts: buy the material, pay it off almost the next day. If cash is tight, riding the 30 days is a legitimate, smart move — you let the job's own deposit money pay for that job's material before the bill ever comes due. Neither is wrong. Not knowing which one you are is what's wrong.
3. If you pay like cash: pay it now, not "soon." Material hits the card, you clear it within a day or two, the balance lives near zero. You get the smoothing without ever carrying weight. This only works if the cash is actually there — don't play cash-payer on money you don't have.
4. If you ride net-30: match each charge to a job that already has a deposit. The rule that keeps net-30 a tool instead of a trap: every dollar you charge should belong to a job whose deposit money will cover it before the bill is due. Charge material for a job you haven't collected a deposit on yet, and you're borrowing with nothing lined up to pay it.
5. Read every statement to zero it out — never just the minimum. Once a month, look at each supplier balance and ask one thing: can I clear this in full when it's due? The day the answer is "no," stop. A balance you roll instead of clear is the line quietly turning into a loan you never agreed to take. And it can stop being only your problem: an unpaid material bill can come back on the house you put that material on — the same last-resort lien from Play 09, except this time it's your customer's house and you're the reason. Ask your supplier and your own attorney how that runs where you work.

Do this this week

Pull up the current balance on every supplier account and write it on one sheet. Next to each one, write the job that money bought and whether that job's deposit is already in the bank. That single list tells you in five minutes whether your credit is a tool or a slow leak.

The tool

No spreadsheet — the tool is the one sheet from Do this this week: every open supplier balance, the job that material bought, and whether that job's deposit is already in the bank. Run it once a month before you pay the statements. Any balance with no deposit behind it is the line quietly turning into a loan, and this sheet shows you that before the statement does.

If your crew is 1099

Nothing to adjust — supplier terms are the owner's and office's buying side, not anything to do with directing a crew. Whether your roofers are W2 or subs, how you run your material accounts is the same job either way.

One more thing: this play is how we run a shop — it's not legal advice. Rules change by state and by contract, so before you act on the legal-sounding parts, run them past your own attorney or accountant. It's your business, and what you do with any of this is your call and your responsibility.