Working Capital
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Net working capital and working capital are the same thing: current assets minus current liabilities. Non-cash working capital is the variant that matters for valuation. It removes cash and interest-bearing short-term debt and leaves the operating items that move with the business: receivables, inventory, payables, and deferred revenue.

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Use working capital to check short-term liquidity. Use non-cash working capital when you're modeling cash flow or enterprise value, because cash and debt are counted elsewhere in a valuation and would otherwise be double-counted.

Negative working capital isn't automatically a warning sign. For subscription and supplier-financed businesses, it usually means customers and vendors are funding operations, which is a sign of strength, not distress.

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Positive working capital means your current assets cover your current liabilities with room to spare, the textbook comfort zone. Negative means the reverse on paper. But the paper reading misleads for SaaS. Deferred revenue sits in current liabilities. It's cash customers paid upfront for service you haven't delivered yet, so it drags reported working capital down while the money stays in your account. As long as deferred revenue is growing and payables are current, negative working capital is the model doing exactly what it should. Aswath Damodaran's valuation work treats this kind of customer and supplier financing as a real funding source, not a liability to fear.

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The change in net working capital, not the level, is what hits cash flow. When net working capital rises, cash is tied up and free cash flow falls. When it drops, cash is released.

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FCF = Operating cash flow − CapEx − Change in net working capital

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This is why fast-growing companies can be profitable on paper yet cash-hungry: growth builds receivables and inventory, and that increase consumes cash before customers pay. Track the direction of the change each period, not just the ending balance.

The cash conversion cycle measures how many days cash is locked up between paying suppliers and collecting from customers. Shorter is better, and a negative cycle means you collect before you pay.

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CCC = DSO + DIO − DPO

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That's days sales outstanding, plus days inventory outstanding, minus days payable outstanding. The 1,000 largest U.S. public companies averaged a 37-day cash conversion cycle in 2025, per the Hackett Group, a 4% improvement year over year. SaaS businesses with upfront billing and no inventory often run a negative cycle, collecting subscription cash before the related costs come due.

Improving working capital comes down to three levers: collect faster, pay strategically, and hold less idle cash and inventory.

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Collect faster. Tighten credit terms, invoice on delivery, and automate dunning to bring down DSO. Pay strategically. Take the full terms you've negotiated without going late, extending DPO without straining suppliers. Hold less. Trim excess inventory and put idle cash to work instead of letting it sit.

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The Hackett Group estimates $1.7 trillion in excess working capital is trapped across large U.S. companies, most of it recoverable through these routines. For SaaS, shifting to annual upfront billing is the single biggest lever: it converts deferred revenue into cash on hand.