Working capital is the cash and short-term assets you need to run daily operations. Too little, and you can\'t pay bills. Too much, and your capital is sitting idle when it could be earning return. Here\'s how to think about working capital.

The basic definition

Working Capital = Current Assets − Current Liabilities

  • Current Assets: cash, accounts receivable, inventory, prepaid expenses (anything liquid within 1 year).
  • Current Liabilities: accounts payable, short-term debt, accrued expenses (anything due within 1 year).

Positive working capital = you have more short-term assets than short-term debts. You can pay bills.

Worked example

Manufacturing company:

  • Cash: $200k
  • Accounts Receivable: $300k
  • Inventory: $400k
  • Total Current Assets: $900k

Current Liabilities:

  • Accounts Payable: $250k
  • Short-term debt: $150k
  • Total Current Liabilities: $400k

Working Capital = $900k − $400k = $500k.

The current ratio

Related metric: Current Ratio = Current Assets / Current Liabilities.

  • Above 1.5: comfortable.
  • 1.0 to 1.5: tight but functional.
  • Below 1.0: cannot pay bills as they come due. Crisis.

From the example: 900 / 400 = 2.25 ratio. Healthy.

Cash conversion cycle

How quickly your business converts spending into cash:

CCC = Days Inventory + Days Receivable − Days Payable

  • Days Inventory: how long products sit before sold = inventory / (COGS/365).
  • Days Receivable: how long after sale until paid = receivables / (revenue/365).
  • Days Payable: how long you wait to pay = payables / (COGS/365).

Lower CCC = less working capital needed.

Industries with negative CCC

  • Amazon: CCC = roughly −20 days. Suppliers paid after sales collected.
  • McDonald\'s: negative CCC. Cash sales, supplier credit.
  • Costco: annual member fees + cash sales. Negative CCC.
  • SaaS with annual prepay: revenue collected before service rendered. Negative CCC.

Negative CCC means growth is self-funding — more sales = more cash before more spending.

Industries with high CCC

  • Manufacturers: 60–90 days CCC. Need significant working capital.
  • B2B with net-60 customers: 90+ days CCC.
  • Construction: 90–180 days CCC. Long projects, slow payments.
  • Government contractors: 90–120+ days CCC. Federal pays slowly.

How much working capital do you need?

Multiple frameworks:

1. CCC × Daily expenses. If your CCC is 60 days and daily operating expense is $5k, you need at least $300k in working capital.

2. 3–6 months of operating expenses in cash. Common rule of thumb. Provides buffer for revenue dips and growth strain.

3. Industry benchmarks. Compare to similar businesses\' current ratio.

4. Zero working capital model. Optimize CCC to negative; never need working capital. Only achievable in specific business models.

The growth-strain problem

Growing businesses face a working capital squeeze:

  • Revenue grows 30% per year.
  • Inventory needs 30% more (same days inventory × bigger sales base).
  • Receivables grow 30% (same days × bigger sales).
  • So working capital required grows ~30% per year.

Profit may not be enough to fund this growth. Need external capital (loans, equity, supplier credit) to grow without running out.

Strategies to reduce working capital needs

1. Faster receivables collection.

  • Tighten payment terms (net-30 → net-15).
  • Discount for early payment (2/10 net 30 = 2% off if paid in 10 days).
  • Aggressive collections process.
  • Factor receivables (sell to a factoring company).

2. Slower payable cycle.

  • Negotiate longer terms with suppliers (net-60 or net-90).
  • Don\'t pay before due date (unless discount).
  • Use procurement cards (extended grace period before payment).

3. Less inventory.

  • Just-in-time ordering.
  • Drop-shipping (no inventory).
  • Faster turnover via demand forecasting.
  • Discontinue slow-moving SKUs.

4. Recurring revenue + prepay.

  • Annual prepay billing.
  • Subscription model.
  • Membership/retainer pricing.

Working capital ratios

Several metrics track working capital efficiency:

  • Current ratio: Current Assets / Current Liabilities. Above 1.5.
  • Quick ratio: (Cash + AR) / Current Liabilities. Above 1.0. Excludes inventory (less liquid).
  • Cash ratio: Cash / Current Liabilities. Most conservative. Above 0.5.
  • Days Working Capital: Working Capital / (Revenue/365). Days of revenue tied up.

Working capital and bank lending

Banks evaluate working capital before lending:

  • Current ratio above 1.5: easier to borrow.
  • Below 1.0: usually denied.
  • Some loans require maintaining minimum working capital ratios (covenants).

Working capital lines of credit are specifically designed to fund the gap between paying suppliers and collecting from customers.

Excess working capital

Too much working capital is also bad:

  • Cash sitting in low-interest accounts (opportunity cost).
  • Excess inventory (carrying cost, obsolescence risk).
  • Slow receivables (customers might not pay).

If your current ratio is above 3.0, you might have too much. Use cash to buy back stock, pay dividends, or invest in growth.

Seasonal working capital

Many businesses need different amounts seasonally:

  • Toy retailer: peak working capital in October (inventory built for Christmas).
  • Lawn care: peak in spring (equipment, mulch, supplies before customers pay).
  • Tax preparer: peak in early year (staff, software, marketing).

Use seasonal lines of credit. Pay back during peak revenue months.

Working capital in a downturn

When revenue drops:

  1. Receivables slow (customers in trouble).
  2. Inventory aging accelerates (less demand).
  3. Need more working capital to maintain operations.

This is the worst time to need cash. Build reserves during good times.

Working capital and acquisitions

When buying another company, working capital affects price:

  • Some deals "lock-box" working capital (buyer takes over with no buffer).
  • Most deals include "normal" working capital — not too high, not too low.
  • Disputes often arise over what "normal" means.

Always specify in acquisition agreements.

Cash management automation

Modern tools track working capital automatically:

  • QuickBooks, Xero: small business accounting.
  • NetSuite: mid-market.
  • SAP, Oracle: enterprise.

Get current ratio, CCC, and cash position on dashboard. Trend over time.

The bottom line

Working capital is the practical bridge between profit (accounting concept) and cash (real-world). Manage it actively:

  • Track current ratio quarterly.
  • Track CCC.
  • Forecast cash 13 weeks out.
  • Build cash reserves of 3–6 months of expenses.
  • Reduce CCC where possible.

Profitable companies fail when they run out of working capital. Don\'t be one of them.

Calculate

For working capital and ratio calculations, use accounting software output. Compare to industry benchmarks and to your own historical position.