An inventory asset is any product or material a business holds with the intention of selling it or using it to produce something it will sell. On the balance sheet, inventory is classified as a current asset, meaning the company expects to convert it into cash within one year. For retailers, inventory might be the clothing on the racks. For manufacturers, it includes everything from the steel in the warehouse to the half-built machines on the factory floor.
Three Stages of Inventory
Not all inventory looks the same. Depending on where a product sits in the production cycle, it falls into one of three categories.
Raw materials are unprocessed inputs used to produce a good. Think aluminum and steel for a car manufacturer, flour for a bakery, or crude oil sitting at a refinery. These items have value on the balance sheet even though they haven’t been transformed into anything sellable yet.
Work-in-progress (WIP) refers to partially finished goods waiting for completion. A half-assembled airplane or a partially completed yacht qualifies as WIP. The value of WIP includes the raw materials already consumed plus the labor and overhead costs applied so far. This category matters because it represents money tied up in production that hasn’t generated revenue yet.
Finished goods are products that have gone through the entire production process and are ready for sale. Once a product reaches this stage, it sits on the balance sheet until it’s sold, at which point its cost moves off the balance sheet and onto the income statement as part of the cost of goods sold.
How Inventory Appears on Financial Statements
Inventory sits in the current assets section of the balance sheet, typically below cash and accounts receivable. Its balance represents the total cost the company has invested in goods it hasn’t sold yet. When those goods are sold, their cost shifts to the income statement through a line item called cost of goods sold (COGS).
The formula connecting these two statements is straightforward: beginning inventory plus purchases minus ending inventory equals cost of goods sold. If you started a quarter with $50,000 in inventory, bought $30,000 more, and ended with $40,000 still on hand, your COGS for the quarter would be $40,000. That $40,000 gets subtracted from revenue to calculate gross profit, which is why how you value inventory directly affects your reported earnings.
Three Methods for Valuing Inventory
When a company buys the same product at different prices over time, it needs a consistent rule for deciding which cost to assign when units are sold. The three most common methods produce noticeably different results.
FIFO (first in, first out) assumes the oldest inventory is sold first. Suppose a furniture store buys 200 chairs at $10 each, then later buys 300 more at $20 each. If the store sells 100 chairs, FIFO assigns the $10 cost to those sales, producing a COGS of $1,000 and leaving $7,000 in remaining inventory. Because the cheaper units flow out first, FIFO tends to report higher profits and a higher inventory value on the balance sheet when prices are rising.
LIFO (last in, first out) assumes the newest inventory is sold first. Using the same furniture store example, LIFO assigns the $20 cost to those 100 chairs sold, producing a COGS of $2,000 and leaving $6,000 in remaining inventory. Higher COGS means lower taxable income, which is why LIFO can be appealing when prices and tax rates are high.
Weighted average cost blends all purchase prices into a single per-unit cost. In the chair example, the store paid a total of $8,000 for 500 chairs, so each chair is valued at $16. Selling 100 chairs produces a COGS of $1,600 with $6,400 remaining. This method works well when individual units are difficult to distinguish from one another, such as fuel, grain, or chemicals, and it smooths out the impact of price swings.
The method a company chooses is not just an accounting preference. It changes reported profits, tax liability, and the value of assets on the balance sheet. Companies must apply their chosen method consistently from period to period.
When Inventory Loses Value
Inventory doesn’t always hold its original cost. Products can become obsolete, damaged, or simply less desirable, and accounting rules require companies to acknowledge that decline. For inventory valued using methods other than LIFO, the standard is the “lower of cost and net realizable value” rule. Net realizable value (NRV) is the estimated selling price minus the costs to complete and sell the item, such as shipping and sales commissions.
If NRV drops below the recorded cost, the company must write the inventory down to that lower value and recognize the difference as a loss. This write-down creates a new, permanent cost basis for that inventory. A company cannot mark it back up in a later fiscal year just because market conditions improved. However, if the value recovers during the same fiscal year, a partial or full reversal of the write-down is allowed within interim periods of that year.
This rule prevents companies from carrying inventory at inflated values that overstate their assets. It is one reason analysts pay close attention to inventory balances: a sudden write-down can signal deeper problems with demand or product relevance.
Measuring How Efficiently Inventory Is Used
The inventory turnover ratio tells you how many times a company sells through its inventory during a given period. The formula is: cost of goods sold divided by average inventory value, where average inventory is the sum of beginning and ending inventory divided by two.
A high ratio generally signals strong sales or efficient purchasing. If a grocery store turns its inventory over 25 times a year, its products are moving off shelves quickly, which means less money sitting idle in unsold goods. On the other hand, an unusually high ratio could also point to insufficient stock, where the company risks running out of products customers want.
A low ratio often indicates overstocking, weak demand, or a mismatch between what a company is producing and what the market actually wants. Products sitting on shelves tie up cash, take up warehouse space, and risk losing value over time. Retailers with low turnover may need to rethink their merchandising or pricing strategies.
What counts as “good” varies dramatically by industry. A grocery chain will naturally turn inventory far more often than a heavy equipment manufacturer. The most useful comparison is against direct competitors or the company’s own historical performance.
Why Inventory Matters Beyond Accounting
Inventory is often one of the largest current assets on a company’s balance sheet, which makes it a meaningful factor in several business decisions. Lenders look at inventory levels when evaluating a company’s liquidity and may accept inventory as collateral for short-term loans. Investors track inventory trends to spot early signs of slowing sales: if inventory grows faster than revenue for several quarters, it can signal that products are piling up unsold.
For business owners, managing inventory well is a balancing act. Carry too much and you tie up cash that could be used elsewhere, while also increasing storage costs and the risk of obsolescence. Carry too little and you miss sales opportunities or pay rush shipping fees to restock. The inventory on your balance sheet represents real money already spent, and your goal is to convert it back into cash through sales as quickly and profitably as possible.