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More businesses fail from running out of cash than from failing to turn a profit. That sounds backwards until you see how the two numbers are actually calculated, because profit and cash flow are answering different questions.
Profit answers "did we make money on paper?"
Profit (or net income) is revenue minus expenses, calculated using accrual accounting. Accrual accounting counts a sale the moment you invoice it, not the moment you get paid, and counts an expense the moment you incur it, not the moment you pay it. That's the standard, and standard accounting practice, and it's the right way to measure whether a business model actually works.
Cash flow answers "do we have the money right now?"
Cash flow only counts money that has actually moved. An unpaid invoice, no matter how certain the client is to pay it, contributes zero to cash flow until it clears. This is the entire gap: a business can log a sale, count it as revenue and profit, and still have nothing in the bank to cover Friday's payroll.
A simple example
A contractor completes a $20,000 job in March. Materials and labor cost $14,000, so on paper that's a $6,000 profit. But the client pays net-60, meaning the $20,000 doesn't land until May. In the meantime, the contractor already paid the $14,000 in costs in March. For two full months, the business shows a profit on its books and a real cash shortfall in its account.
Why lenders and investors watch both
A profit and loss statement shows whether the business model works. A cash flow statement shows whether the business can survive long enough to prove it. Lenders in particular pay close attention to cash flow because a business with strong margins but chronically late-paying customers is a real default risk, even with a healthy profit margin on paper.
What this means in practice
- Track both numbers separately. Profit tells you if the business works; cash flow tells you if you'll be around next month.
- Shorten your payment terms where you can, or offer a small early-payment discount to pull cash forward.
- Keep a cash reserve sized to your average collection gap, not your average expenses.
- If invoices routinely sit unpaid for 30-60+ days, invoice factoring is worth understanding as a way to convert receivables into cash faster.
For the fuller picture of how to manage this gap on an ongoing basis rather than firefighting it month to month, see our complete guide to small business cash flow management.