Quick Answer: Residential plumbing usually pays on completion, but commercial and general-contractor work runs on net-30, net-60, or net-90 terms — while your plumbers get paid every week. That timing mismatch is the core cash-flow problem in commercial plumbing. Invoice factoring turns those slow invoices into near-immediate cash, and a line of credit covers the general swings. Get matched to compare.
Residential vs. Commercial: Two Payment Worlds
A plumbing company that grows from residential service into commercial and new-construction work often runs into a cash-flow wall it didn’t see coming. Residential service is close to a cash business: the work is done in a day and the homeowner pays at completion or on the spot. Commercial work behaves nothing like that. Invoices to property managers, facilities groups, and especially general contractors carry net-30, net-60, or net-90 terms as standard. Payment can be gated by progress billing, lien-waiver paperwork, retainage held until project completion, and “pay-when-paid” clauses that don’t release your money until the GC’s client pays them.
Meanwhile, none of your costs wait. Plumbers are paid weekly. Suppliers want paying on delivery or net-30. So the more commercial work you take, the larger the pile of completed, invoiced, profitable jobs sitting unpaid on your books — and the tighter your actual bank balance feels. This is the classic trap: the business looks like it’s winning on paper while struggling to make Friday payroll.
Why Growth Makes It Worse Before It Gets Better
Counterintuitively, landing a bigger commercial contract can deepen the hole in the short term. A larger job means more plumbers on site, more material bought up front, and a bigger invoice — all of which go out the door immediately, while the net-60 payment lands two months later. Win two or three large jobs close together and you may have a record month in booked revenue and your tightest month ever in cash. That is not a sign the work is bad; it is the math of funding payroll and materials today against invoices that pay in 60 days. Recognizing this lets you arrange financing as part of the growth plan instead of scrambling once the squeeze hits.
Invoice Factoring: Turning AR Into Cash
Invoice factoring is purpose-built for the net-60 problem. After you complete a job and bill a creditworthy commercial customer, the factor advances most of the invoice value — commonly a large majority — within a day or two. When your customer pays on their normal terms, the factor remits the remainder minus its fee. In effect, you stop waiting 60 days and get paid within days of billing, every time, with the financing scaling automatically as you invoice more. Because factoring leans on the strength of your customer’s credit rather than only yours, it can also work for newer plumbing companies that have solid commercial accounts but a thin balance sheet.
A Line of Credit for General Flexibility
Factoring is tied to specific invoices; a business line of credit is not. A line gives you flexible capacity you can use for anything — payroll across both residential and commercial work, a material order, or a slow week — drawing only what you need and repaying as cash returns. Many established plumbing companies run both: a line of credit as the everyday shock absorber, and factoring layered in specifically when commercial receivables stretch out and tie up large amounts. The right mix depends on how much of your revenue is net-terms commercial AR versus pay-on-completion residential.
Shrink the Gap Operationally, Too
Financing bridges the timing gap; good billing discipline narrows it. Invoice the day a job is complete rather than at month-end, submit lien waivers and required documentation promptly so nothing gives the payer a reason to delay, track aging receivables weekly, and be selective about which GCs and accounts you extend long terms to. Negotiating partial progress payments or deposits on large commercial jobs also pulls some cash forward. The tighter your billing operation, the less you need to borrow and the better your file looks to a factor or lender — who will look at the quality and aging of your receivables, your time in business, and consistent revenue.
A Worked Net-60 Gap
Trace the cash through one commercial relationship. You pick up a property-management account doing roughly $40,000 a month of plumbing work across their buildings, billed net-60. The work itself is profitable. But look at the timing: you complete and bill January’s $40,000, yet it won’t pay until late March. Meanwhile you’re completing February’s and March’s work too — paying plumbers weekly and parts suppliers on delivery the whole time. By the time that first invoice pays, you’re effectively carrying around $80,000–$120,000 of completed-but-unpaid work for that one account.
That’s the trap: the account is a great piece of business and the source of a serious cash squeeze at the same time. Two tools close it. With invoice factoring, you bill the $40,000 and receive the bulk of it within a day or two instead of waiting 60 days; when the client pays, you get the remainder minus the fee. Your cash now tracks your billing, not your client’s AP calendar. Alternatively, a line of credit sized to that ~$100,000 carrying balance lets you draw to cover payroll and parts and repay as the net-60 invoices land. Many shops factor the big commercial accounts and keep a line for everything else.
You also don’t have to factor everything, and you shouldn’t. Most plumbing companies factor selectively — routing only their large, slow-paying commercial and GC invoices through the factor while letting fast-paying residential and small-commercial work flow normally. That keeps the fees attached to the receivables that actually create the cash gap, rather than skimming a fee off invoices that would have paid quickly anyway. It’s worth understanding the recourse terms too: whether you or the factor carries the risk if a customer ultimately doesn’t pay shapes both the cost and which accounts make sense to factor. Used deliberately on the right invoices, factoring is a precise tool, not a blanket cost on your whole book. As your own balance sheet and time in business strengthen, you may also graduate from factoring to a larger line of credit at a lower cost — many plumbing companies use factoring to fund early commercial growth, then shift to a revolving line once they qualify for the limit they need.
The figures are illustrative, not a quote, but they show why winning commercial work can feel like going backwards before it pays off — and why the financing should be arranged when you take the account, not after the third payroll squeezes you. Sized correctly, the gap becomes a line item you fund and forget, and the account is pure upside.
Bottom Line
Commercial plumbing pays on net terms while payroll runs weekly, so growth into bigger jobs widens the receivables gap before it fills the bank account. Use invoice factoring to convert slow commercial invoices into near-immediate cash, a line of credit for everyday flexibility, and tight billing to shrink the gap at the source. Start at the plumbing business financing hub, then get matched to compare options.