Working Capital

How working capital is calculated

The basic formula:

• Working capital = current assets - current liabilities.
• Current assets — cash, accounts receivable, inventory, prepaid expenses.
• Current liabilities — accounts payable, short-term debt, accrued expenses.
• Positive working capital — short-term assets exceed obligations.
• Negative working capital — short-term obligations exceed assets.

A core measure of short-term financial health.

Why working capital matters

Several reasons:

• Liquidity — ability to meet short-term obligations.
• Operations — funds day-to-day activities.
• Growth funding — expansion needs working capital.
• Cushion — buffer against unexpected costs or revenue shortfalls.
• Health signal — declining working capital can signal trouble.

Insufficient working capital is a common cause of business failure.

Optimal working capital

Trade-offs:

• Too little — can't pay obligations; operations strained.
• Too much — capital sitting idle that could earn returns.
• Industry-specific — retail vs. software have different needs.
• Negative working capital — sometimes optimal (Amazon, McDonald's).

Optimal level depends on business model and industry.

Negative working capital

When it works:

• Cash sales — get paid before paying suppliers.
• Long supplier terms — pay in 60 days, sell in 30.
• Low inventory — software, services.
• Examples — Amazon, McDonald's run negative working capital efficiently.

Negative working capital can be a sign of bargaining power, not weakness.

Working capital management

Levers to optimize:

• Receivables collection — faster collection improves position.
• Payables timing — pay later (without damaging supplier relationships).
• Inventory turnover — less inventory needs less working capital.
• Cash management — efficient cash deployment.

Active management matters as much as level.

Working capital cycle

The cash conversion cycle:

• Days inventory outstanding — how long inventory sits.
• Days sales outstanding — how long to collect from customers.
• Days payable outstanding — how long before paying suppliers.
• Cycle = DIO + DSO - DPO.

Shorter cycle = less capital tied up.

Working capital and financing

Common financing:

• Lines of credit — flexible funding for working-capital needs.
• Receivables factoring — sell receivables for immediate cash.
• Inventory financing — borrow against inventory.
• Trade credit — supplier financing through payables.

Various tools fund working capital efficiently.

Working capital in valuation

Investment analysis:

• Changes in working capital affect cash flow.
• Growing companies typically need more working capital.
• DCF models — must subtract working capital growth.
• Free cash flow — operating cash flow minus capex minus working capital change.

Working capital is critical to true cash generation.

What individuals should know

For business owners:

• Manage working capital carefully — major source of failures.
• Optimize cycle — collect faster, pay slower (without damaging relationships).
• Match financing to working-capital needs.

For investors:

• Working capital trends signal business health.
• Negative working capital can be excellent (efficient model) or terrible (overstretched).
• Cash conversion matters for true profitability.

Working capital is one of the most-important measures of business operations and financial health. Understanding it helps in business management and investment analysis.