Your company shows $500k profit on the income statement. You can\'t make payroll. How? Profit is an accounting concept; cash is what actually pays bills. The difference between them — working capital, accounts receivable timing, inventory — kills more businesses than lack of profit ever will.

Profit vs cash flow: the fundamental difference

Profit: revenue earned − expenses incurred. Accrual accounting.

Cash flow: cash received − cash paid. Real money in and out.

These can be very different in any given period.

Where the gap comes from

Accounts receivable: you book a sale (and the profit) when you ship. But you don\'t get cash until the customer pays — possibly 30, 60, or 90 days later.

Accounts payable: you book the expense when you receive supplies. You may pay 30+ days later. Your costs hit P&L before they hit your cash.

Inventory: you spend cash buying inventory. The expense doesn\'t hit P&L until the item is sold (COGS). Cash is gone but profit hasn\'t recorded the loss yet.

Capital expenses: you buy a $100k machine. Profit reflects $20k depreciation per year for 5 years. Cash is gone immediately.

Worked example: profitable company running out of cash

Software company. Sells $1M of contracts in Q1, all annual contracts paid quarterly.

P&L view:

  • Q1 revenue: $250k recognized (1/4 of annual).
  • Q1 expenses: $200k (salaries, hosting).
  • Q1 profit: $50k.

Cash flow view:

  • Q1 cash in: $1M (annual prepay).
  • Q1 cash out: $200k (salaries, hosting).
  • Q1 cash flow: $800k.

This is great — high cash flow with modest paper profit. But the inverse can happen.

Worked example: profitable but cash-strapped

Manufacturer. Books $500k revenue in Q1 (shipped to customers). Customers pay in 60 days.

P&L view:

  • Q1 revenue: $500k.
  • Q1 expenses: $400k (materials, labor).
  • Q1 profit: $100k.

Cash flow view:

  • Q1 cash in: $0 (customers haven\'t paid yet).
  • Q1 cash out: $400k (paid suppliers and workers).
  • Q1 cash flow: −$400k.

This company is profitable but cash-negative. Without working capital reserves, it will run out of money before customers pay.

Why fast-growing companies often run out of cash

The "growth trap":

  1. You grow sales 50% year over year.
  2. You need more inventory to support the growth.
  3. You need to pay suppliers before customers pay you.
  4. Profit grows but cash needs grow faster.

Many growing manufacturers and retailers go bankrupt despite being profitable, because growth requires increasing working capital faster than profit can fund.

The cash conversion cycle (CCC)

How long capital is tied up before becoming cash:

CCC = Days Inventory + Days Receivable − Days Payable

  • Days Inventory: how long inventory sits before sale.
  • Days Receivable: how long after sale until customer pays.
  • Days Payable: how long you wait to pay suppliers.

Lower CCC = better cash flow. Some companies have negative CCC (paid before they pay) — they grow without needing cash.

Negative CCC examples

Amazon: customers pay immediately; suppliers wait 60+ days. Negative CCC means Amazon\'s cash position grows with sales.

Costco: members pay annual fees up front. Goods are sold for cash. Pays suppliers later.

SaaS with annual prepay: customers prepay; salaries paid monthly. Cash flow looks great.

Common cash flow killers

1. Slow-paying customers. Bigger customers (especially government, large enterprises) pay 60–90+ days. If your costs run weekly, this is brutal.

2. Inventory build-up. Carrying unsold goods. Cash spent, profit not yet realized.

3. Capital investments. Buying equipment, real estate. Big cash outflow; profit impact via depreciation over years.

4. Tax payments. Quarterly estimated taxes. Profit looks good, then big cash hit.

5. Seasonal businesses. Summer landscaping company has all profit and cash in May–September. Then 6 months of overhead with no revenue.

Strategies for managing cash

1. Get paid faster. Discount for early payment (1–2% for net-10). Aggressive collections. Net-30 terms maximum where possible.

2. Pay suppliers slower. Negotiate net-60 or net-90 terms. Don\'t pay early unless they offer discount.

3. Reduce inventory. Just-in-time ordering. Drop-ship where possible.

4. Subscriptions over one-time. Predictable cash; better terms.

5. Lines of credit. Bank line of credit for working capital fluctuations. Use as needed; pay back when cash flows in.

6. Factor receivables. Sell invoices to a factoring company at a discount for immediate cash. Expensive (10–20%) but provides cash for fast-growing businesses.

7. Maintain cash reserves. 3–6 months of operating expenses in reserve. Cushion against downturns or growth strain.

The 13-week cash flow forecast

Standard tool for cash management:

  1. Forecast every cash inflow week-by-week (when customers will actually pay).
  2. Forecast every cash outflow week-by-week (payroll, rent, supplier payments).
  3. Track running cash balance.
  4. Identify weeks with negative cash position and fix in advance.

Update weekly with actuals. The discipline of weekly cash forecasts prevents most cash crises.

Cash flow statement

Standard financial statement showing:

  • Operating activities: cash from running the business.
  • Investing activities: cash for buying/selling assets.
  • Financing activities: cash from loans, equity, dividends.

Read your cash flow statement quarterly. Operating cash flow should be positive (or trending positive). Investing cash flow is usually negative (spending). Financing depends on whether you\'re raising or paying back debt.

Free cash flow

FCF = Operating cash flow − capital expenditures.

This is the cash available for growth, dividends, or debt reduction. The single most-watched metric for valuing companies.

FCF can differ wildly from accounting profit. Investors pay attention to both but increasingly focus on FCF.

Cash is king

Old saying among entrepreneurs: "Profit is opinion; cash is fact."

Profit involves judgments (depreciation methods, accruals, inventory valuations). Cash is unambiguous.

You can\'t pay employees with profit. You pay them with cash.

The seasonal business cash trap

Lawn care, landscaping, ski resorts, holiday-focused businesses:

  • 4–6 months of strong cash flow.
  • 6–8 months of mostly costs without revenue.

Need cash reserves to survive the off-season. Many fail by overspending in good months.

Calculate cash impact

For specific cash flow questions: track receivables and payables aging weekly. Use a 13-week cash flow forecast spreadsheet (templates widely available).

Profit alone doesn't tell you whether you can make payroll next month. Cash flow forecast does.