It’s one of the most frustrating patterns in construction: the job P&L says you made money, but the bank balance says something else entirely. Profitable contractors run short of cash more often than unprofitable ones get caught off guard — because profit and cash are measuring two different things.
Why Profit and Cash Aren’t the Same Thing
Profit is an accounting measure — revenue earned minus costs incurred, often recognized on a percentage-of-completion basis. Cash is simpler and less forgiving: what’s actually in the bank account today. A job can be profitable on paper while still draining cash, because materials, labor, and subcontractors often have to be paid well before the matching revenue is collected.
See a worked WIP schedule example for how earned revenue, billing, and cost timing can diverge on a single job — the same gap shows up across the whole company when you’re running several jobs at once.
The Biggest Cash-Flow Traps for Contractors
- Retainage held back. 5–10% of every draw may not arrive until the job closes out, sometimes months later.
- Underbilling. Work performed ahead of what’s been invoiced ties up cash in jobs that look fine on the P&L.
- Slow draw approval. Time between submitting a pay application and actually receiving funds can stretch for weeks.
- Upfront material costs. Equipment and materials are often paid for well before the related billing milestone is reached.
- Payroll doesn’t wait. Labor gets paid on a fixed schedule regardless of where billing and collections stand.
A Simple Cash-Flow Forecast (Illustrative Example)
The numbers below are a simplified, illustrative example, not results from an actual AmpleX Consultants client. A basic rolling forecast lines up expected cash in against committed cash out, job by job, over the next several weeks.
| Week | Expected Draws & Collections | Payroll, Materials & Sub Payments | Net Cash Change |
|---|---|---|---|
| Week 1 | $38,000 | $52,000 | ($14,000) |
| Week 2 | $61,000 | $47,000 | $14,000 |
| Week 3 | $22,000 | $58,000 | ($36,000) |
| Week 4 | $75,000 | $49,000 | $26,000 |
In this illustrative example, Week 3 shows a $36,000 cash shortfall even though the month as a whole nets positive. Without forecasting at this level of detail, that gap can show up as a surprise — forcing a scramble for a line of credit draw or a delayed vendor payment instead of a planned decision.
What to Track Weekly
- Expected draw approvals and collection dates by job
- Retainage balances and expected release dates
- Committed payroll and subcontractor payment obligations
- Material purchases tied to upcoming job starts
- Available line of credit or cash reserves as a buffer
Cash-flow forecasting works best when it’s built on accurate job costing and WIP data in the first place — see construction bookkeeping and job costing. For ongoing forecasting and strategic guidance built around how contractors actually get paid, see construction fractional CFO services.
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