Yes, working capital does include inventory. The standard formula is current assets minus current liabilities, and inventory sits on the current-assets side alongside cash, accounts receivable, and prepaid expenses. In many businesses it’s the biggest single piece of that side: inventory can account for 30 to 50 percent of total current assets in manufacturing and retail. That concentration is why the answer isn’t quite as simple as “yes.” Inventory counts, but it’s the hardest current asset to turn into cash, and treating it as if it were interchangeable with the cash line is how business owners get into trouble.
Why Inventory Is a Current Asset
Inventory qualifies as a current asset because a business expects to sell or use it within one year or one operating cycle, whichever is longer. The Financial Accounting Standards Board governs how companies measure and report inventory under ASC 330, though the codification leaves room for judgment.1KPMG International. Handbook: Inventory Canned goods in a warehouse, steel on a factory floor, half-built assemblies on a production line, finished products ready to ship: all of it represents future revenue, and all of it lands on the asset side of the balance sheet.
That classification is what pulls inventory into the working capital calculation. When a lender or supplier looks at current assets to judge whether a company can cover its short-term obligations, inventory is part of the picture. A manufacturer holding $2 million in raw steel and finished parts appears to have more breathing room than one with $200,000 in spare components. Whether that appearance is real depends on how quickly the inventory can move.
How Inventory Changes the Working Capital Number
The formula is straightforward. Current assets include cash, accounts receivable, inventory, and prepaid expenses. Current liabilities cover accounts payable, short-term loans, wages owed, and any debt due within a year. Subtract the second from the first, and you have working capital.
Consider a distribution company with $800,000 in total current assets, $300,000 of which is physical stock. That inventory accounts for nearly 40 percent of the asset side. Subtracting $500,000 in current liabilities leaves $300,000 in net working capital. Now suppose the company doubles its inventory purchases on 60-day credit terms. Both current assets and current liabilities rise. On paper, working capital may still look fine. In reality, the cash available for payroll might have shrunk, because most of the new “assets” are sitting on shelves and most of the new liabilities come due in two months.
That’s the trap. A rising working capital figure can mask a real cash flow problem when the growth is coming from inventory rather than cash or receivables. The number tells you whether current assets exceed current liabilities. It doesn’t tell you whether those assets can pay this month’s bills.
Why Inventory Is the Weakest Link
Cash is immediately spendable. Accounts receivable will arrive in 30 or 60 days if the customer pays. Inventory has to find a buyer, get sold, and then wait for payment. That process can take weeks or months, and it’s why analysts treat inventory as the least reliable piece of the working capital chain.
The stage of production matters too. Raw materials are the easiest inventory to liquidate because another manufacturer can usually use them. Work in process is the hardest, because a half-assembled product is often useless to anyone but the company making it. Finished goods sit in between: high value per unit, but only one sale away from becoming cash. On most balance sheets these categories collapse into a single inventory line, so the working capital figure gives no hint of which mix a company is holding.
Market conditions can also erode inventory value quickly. Technology becomes obsolete, food spoils, fashion goes out of style. When that happens, the company must write the inventory down. Companies using FIFO or average cost methods measure inventory at the lower of cost and net realizable value, meaning they compare what they paid against what they can realistically sell it for and record whichever number is lower. Companies using the LIFO method still follow the older “lower of cost or market” framework.2Financial Accounting Standards Board. Accounting Standards Update 2015-11, Inventory (Topic 330) Either way, a write-down hits the income statement as a loss and directly reduces current assets, shrinking working capital in the process.
The Quick Ratio: Working Capital Without Inventory
Because inventory can distort the picture, financial analysts use a companion measure that strips it out. The quick ratio, sometimes called the acid-test ratio, divides only the most liquid current assets — cash, cash equivalents, and accounts receivable — by current liabilities.
Imagine a business with $100,000 in current liabilities, $50,000 in cash, and $200,000 in unsold stock. Standard working capital looks solid. The quick ratio tells a different story, revealing a potential cash crunch if sales slow down. A company in that position is asset-rich and cash-poor, and any disruption could leave it unable to make payroll. If you want to know whether including inventory in working capital is giving you an honest read on liquidity, running the quick ratio next to it is how you check.
How Valuation Method Changes the Inventory Number
The same pile of goods can produce different working capital figures depending on which accounting method values it. The two most common approaches assign costs in opposite order, and the choice matters more than most business owners realize.
Under FIFO (first in, first out), the oldest costs flow to cost of goods sold first, leaving newer, typically higher costs on the balance sheet as ending inventory. During periods of rising prices, FIFO produces a higher inventory value, which inflates current assets and makes working capital look stronger. Under LIFO (last in, first out), the newest costs hit the income statement first, leaving older, lower costs in inventory. That deflates the balance sheet inventory value and results in lower reported working capital, though it also reduces taxable income. A company that elects LIFO for tax purposes must also use it for financial reporting to shareholders and creditors.3IRS. Practice Unit – Adopting LIFO
For tax purposes, the IRS allows businesses to value inventory at cost or at the lower of cost or market, whichever method they elect.4IRS. Lower of Cost or Market (LCM) What matters for working capital analysis is the balance sheet number, which follows the GAAP rules. The takeaway is that the valuation method silently shapes how much working capital a company appears to have, even when the physical inventory hasn’t changed at all.
Turnover and Days Outstanding: The Reality Check
Two metrics tell you whether the inventory inside working capital is helping or hurting. Both are simple, and lenders use them routinely.
The inventory turnover ratio measures how many times a company sold through its entire inventory during a period. Divide cost of goods sold by average inventory. A company with $100,000 in cost of goods sold and an average inventory balance of $50,000 turned its inventory over twice. Higher turnover generally signals strong demand and efficient operations. Lower turnover suggests overstocking, weak sales, or both, and it means more cash is trapped in unsold goods.
Days inventory outstanding flips the same data into calendar days. Divide 365 by the turnover ratio, and you get the average number of days it takes to sell through inventory. A ratio of 4.0 means roughly 91 days. If that figure creeps upward quarter over quarter, inventory is accumulating and working capital quality is deteriorating even if the raw dollar figure hasn’t changed.
These metrics separate companies that look liquid from those that actually are. A business might report strong working capital while sitting on six months of unsold product. The turnover ratio and days outstanding expose that gap in a way the basic formula cannot.
When Negative Working Capital Isn’t a Crisis
Negative working capital, where current liabilities exceed current assets, sounds alarming. It isn’t always a problem. Some of the most successful retailers and grocery chains operate with negative working capital as a deliberate strategy: they collect cash from customers at the register before supplier terms require payment, and daily cash flow covers obligations without needing a cushion.
For inventory-heavy businesses outside those fast-turnover models, negative working capital is more concerning. A manufacturer holding slow-moving inventory with mounting accounts payable may find itself unable to pay suppliers, which can trigger supply chain disruptions. Context decides the meaning. A negative number paired with high inventory turnover and strong daily cash flow is a different animal from a negative number caused by bloated inventory nobody is buying.
Borrowing Against Inventory
When inventory ties up too much cash, businesses sometimes borrow against it. Asset-based lenders use a borrowing-base formula that typically advances 40 to 50 percent of eligible inventory value, though the exact rate depends on the type of stock. Finished goods generally qualify for higher advance rates than raw materials, and custom or perishable products may be discounted heavily or excluded entirely.
The same factors that make inventory less liquid as a current asset — obsolescence risk, spoilage, specialized use — also reduce what a lender will advance against it. A company that keeps clean, well-documented, easily valued inventory can unlock cash more quickly and at better terms than one with disorganized stock records. Managing inventory well and managing working capital well turn out to be the same job.