Working Capital

Formula

Working capital = Current assets − Current liabilities

If:

• current assets: $1.4 billion
• current liabilities: $1.0 billion

working capital is:

$400 million

That $400 million is not necessarily available cash. It can be tied up in receivables, inventory or prepaid assets.

Positive working capital can be useful

A positive balance can provide room to:

• pay suppliers
• fund payroll
• absorb customer-payment delays
• carry inventory
• manage seasonal demand
• meet near-term obligations

The cushion matters most when the assets are liquid and the liabilities are not concentrated in one immediate payment.

Positive working capital can also trap cash

Suppose sales are flat while:

• receivables rise 30%
• inventory rises 40%
• payables stay unchanged

Working capital increases.

Cash conversion may be deteriorating because more money is tied up in unpaid invoices and unsold goods.

A larger working-capital balance is not automatically an improvement.

Receivables can absorb cash

A company can recognize credit revenue before collecting the customer.

If receivables rise:

• earnings may increase
• operating cash flow may lag

That is normal accrual accounting.

The key question is whether the receivables are collectible and whether collection timing is stable.

Inventory can absorb even more

Inventory requires cash before it becomes a sale.

A build can be rational if management is preparing for:

• growth
• seasonality
• supply shortages
• longer lead times

It can be weak if demand is slowing or products are becoming obsolete.

Working capital measures the cash commitment without deciding whether it is wise.

Payables can preserve cash

If accounts payable rises, the company has delayed cash outflow relative to purchasing or expense recognition.

That can increase operating cash flow in the period.

The benefit can be durable if supplier terms improved.

It can be temporary if vendors are merely being paid later.

Working capital vs. current ratio

Using:

• current assets: $1.4 billion
• current liabilities: $1.0 billion

Working capital:

$400 million

Current ratio:

1.4x

The dollar amount shows absolute cushion.

The ratio shows relative cushion.

Both use the same balance-sheet categories.

Negative working capital is not automatically distress

A company can operate with negative working capital if it:

• collects from customers immediately
• turns inventory quickly
• pays suppliers later
• receives subscription prepayments

Retailers and some subscription businesses can operate this way successfully.

A contractor waiting months for customer payment faces a different liquidity structure.

Deferred revenue can make working capital look weaker

A software company can collect cash upfront.

The cash is recorded as an asset.

The obligation to provide future service is recorded as deferred revenue, often a current liability.

Working capital can therefore be low or negative even though the company already holds customer cash.

That liability is economically different from a bank maturity requiring cash repayment.

Current debt can change the picture quickly

A long-term borrowing becomes current as maturity approaches.

Working capital can drop sharply even though total debt did not change.

The decline still matters.

Refinancing or repayment is now closer.

Working-capital changes drive operating cash flow

A simplified pattern:

• receivables increase → cash use
• inventory increases → cash use
• payables increase → cash source
• deferred revenue increases → cash source
• prepaid expenses increase → cash use

These are timing effects.

They explain why net income and operating cash flow often differ.

A real Northrop Grumman example

Northrop Grumman reported that changes in trade working capital used more than $2.5 billion of cash in the first half of 2026 even while net earnings were positive.^[4]

The company’s trade working-capital presentation includes receivables, unbilled receivables, inventoried costs, trade payables and advance payments or billings in excess of costs.^[4]

That shows how profitable activity can still consume cash.

Growth can worsen working capital for good reasons

A company growing 30% may need:

• more inventory
• more receivables
• more production inputs

Cash flow can lag earnings.

That can be acceptable if the incremental working capital supports attractive future profit.

Growth is not free.

Working capital can improve because a business shrank

The opposite can happen.

A company can release cash by:

• collecting old receivables
• reducing inventory
• cutting purchases

while revenue declines.

Operating cash flow may improve temporarily.

The business may still be weakening.

The source of the cash matters.

Seasonality can dominate the snapshot

A retailer before holidays can report:

• higher inventory
• higher payables
• lower cash

A distributor after a sales peak can report:

• high receivables
• low inventory

One quarter-end should be compared with:

• the same quarter a year earlier
• sequential periods
• revenue growth
• cash conversion metrics

Real filing examples

MSC Industrial Direct reported working capital of about $452 million at May 30, 2026 and explicitly defined it as current assets less current liabilities.^[2]

Empire Petroleum reported negative working capital of about $16.3 million at June 30, 2026.^[3]

Those figures cannot be ranked without considering company size, business model, asset quality and financing access.

A useful working-capital review asks:

1. Receivables: Are customers paying slower or faster?
2. Inventory: Is growth matched by demand?
3. Payables: Are supplier terms improving or being stretched?
4. Debt: Did financing liabilities move into the current bucket?
5. Seasonality: Is the reporting date representative?
6. Cash flow: Are working-capital changes recurring or temporary?

Working capital is most useful when analyzed as a cash-conversion system, not just a subtraction problem.