Profit and cash are not the same thing

The number that closes a contractor is almost never a loss — it’s a Friday. Payroll is due, the crew is counting on it, and the progress payment that would have covered it is still three weeks out. On paper the job made money. In the bank there’s nothing to pay it with. That gap between profit and cash is where healthy-looking contractors quietly go under.

Profit is what the work earned once every cost is counted. Cash is what’s actually in the bank on a given day. They move on different clocks. You spend on materials and labor now and get paid on terms later, so a growing, profitable business can run dangerously tight on cash precisely because it’s growing — every new job ties up money before it returns any.

Managing cash flow is managing that timing on purpose instead of by surprise. This guide covers the forecast that shows the pinch before it lands, the levers that pull cash in faster, and the reserve that turns a bad month from a crisis into a shrug. If your records aren’t current enough to trust the numbers, you’ll want to catch your books up first — a forecast built on stale data just lies to you faster.

Build a 13-week cash forecast

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Step 1
Start with the cash you have in the bank today — one real number.
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Step 2
List expected money in, week by week: progress payments, final invoices, retainage.
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Step 3
List expected money out: payroll, supply house, subs, rent, loan payments.
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Step 4
Run the balance forward each week — the point is spotting the week that goes negative.
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Step 5
Update it every week so it always looks 13 weeks ahead, never backward.

The 13-week cash forecast

The single most useful tool in cash management is a rolling 13-week forecast — a simple week-by-week map of the cash you expect in and the cash you expect out for the next quarter. Thirteen weeks is long enough to see a slow patch coming and short enough that your estimates are still grounded in real jobs and real bills, not guesses about next spring.

It’s not complicated. Start with the cash you have today. For each of the next thirteen weeks, list the money you realistically expect to collect — progress payments, final invoices, retainage releases — and the money you know you’ll pay out: payroll, the supply house, subs, rent, loan payments. The running balance at the bottom of each week is the whole point. It tells you which week goes negative before you get there.

That forward view is the difference between arranging a line of credit calmly in week three and begging for one in a panic in week nine. Building and reading a rolling forecast every week is exactly the kind of 13-week cash flow forecasting a fractional CFO runs for a contractor — but even a rough version you keep yourself will change how you sleep.

Pull cash in faster

The fastest cash you’ll ever find is the money already owed to you. Receivables — invoices sitting unpaid — are your own cash parked in someone else’s bank. Most contractors are far too patient with them. Invoice the day the work is done, not at the end of the month, and the clock on getting paid starts two weeks sooner for free.

Structure the terms so the job funds itself. Deposits up front, progress billing tied to milestones on longer jobs, and a real system for chasing anything past due keep cash arriving while costs are going out — instead of you floating the whole project on your own back. A customer who owes you money at ninety days has effectively taken a loan from your business, and you’re paying the interest.

Watch the aging on those receivables the way you watch the weather. The longer an invoice sits, the less likely it ever comes in full, so a standing routine — a reminder at fifteen days, a call at thirty, firmer action at sixty — turns collections from an awkward afterthought into a quiet, predictable habit that keeps the bank balance honest.

Control the timing of what goes out

Cash management runs both directions. On the paying side, the move isn’t stiffing anyone — it’s using the terms you’re given on purpose. If a supplier gives you thirty days, there’s rarely a reason to pay in five. Holding cash the full term, then paying on time, keeps money in your bank working for you right up to the moment it’s due.

Line up the big outflows against the inflows you can see coming. If you know a major materials order and a payroll run both land the same week, and no collection is due until the week after, that’s a squeeze you can move now — delay the order a few days, or push to collect a receivable early — instead of discovering it when the payment bounces. The forecast makes those collisions visible in advance.

The trap to avoid is letting a flush week fool you. A big deposit lands, the bank balance looks great, and it feels like room to spend — but half of that money is already spoken for by payroll and materials on the job that generated it. Reading cash against the forecast, not against today’s balance, is what keeps a good week from writing a check the following week can’t cover.

Build a reserve before you need it

Every contractor hits a bad stretch — a slow season, a job that drags, a customer who pays late and big. The businesses that survive those stretches aren’t the ones that never hit them; they’re the ones that kept a cushion. A cash reserve is the difference between a rough month you ride out and a rough month that forces a loan on bad terms or a payroll you can’t make.

Aim to build up enough to cover a few weeks of payroll and fixed costs with nothing coming in, and treat it as untouchable working capital rather than spare spending money. It won’t happen overnight. Set aside a small, fixed share of every collection into a separate reserve and leave it alone, and the cushion grows quietly in the background while you run the business.

The other side of the same coin is arranging credit while you’re strong, not desperate. A line of credit is cheapest and easiest to get when your books are clean and you don’t urgently need it. If you’re heading toward a bank for that line, our guide to lender-ready financials shows exactly what they’ll want to see — and having it ready is itself a form of cash insurance.