Inventory is an asset until it sells, at which point it becomes cost of goods sold. Recording purchases straight to expense understates profit in buying months, overstates it in selling months, and hides how much cash is sitting on the shelf.
Inventory is the one balance sheet item that behaves like an expense in every owner’s intuition and like an asset in the accounting. That mismatch produces most of the errors.
The mechanics, briefly
You buy goods; cash becomes inventory, an asset. You sell them; that portion of inventory becomes cost of goods sold, an expense, in the same period as the sale it relates to.
Matching those two is the entire point. It is what makes gross margin a real number rather than an artifact of when you happened to restock.
What goes wrong
Recording every purchase straight to cost of goods sold. Profit then collapses in months you bought heavily and looks excellent in months you did not, regardless of what you actually sold.
The balance sheet is wrong too — it shows no inventory, so the business appears to hold less than it does. Lenders notice that.
Counting
Records drift from reality through theft, damage, breakage, miscounting and sales recorded incorrectly. A physical count is the only way to find out by how much.
Annually is the minimum. Quarterly is better if inventory is a large share of your assets, because a shrinkage problem found in month three can be acted on and one found in month twelve cannot.
Costing methods
How you value what remains — first in first out, weighted average, specific identification — changes both the balance sheet and the reported profit, particularly when purchase prices move.
The method is your CPA’s decision and it needs to be applied consistently. Switching between them because one looks better in a given year is not available.
The cash conversation
The most useful thing inventory accounting tells a small business is how much cash is sitting still. A growing inventory balance alongside flat sales is cash converting into shelf space.
That shows up nowhere on the income statement, which is why a profitable business can be unable to make payroll. It is the single most common reason owners are surprised by their own bank balance.
What belongs in the cost
Not just the purchase price. Freight in, duties and the direct costs of getting goods ready to sell generally belong in inventory value rather than in operating expenses.
Leaving freight in expenses understates inventory and overstates costs in the month goods arrive, which distorts margin exactly as recording purchases to expense does, only more subtly.
Write-offs need recording
Damaged, obsolete or stolen stock is not inventory any more, and leaving it on the books overstates assets and delays a loss you have already taken.
Write it off when you identify it, with a reason code that lets you see the pattern. A rising damage line is an operations problem the balance sheet is reporting to you.
Common questions
- When does inventory become an expense?
- When it sells. Until then it is an asset on the balance sheet, which is why a large purchase does not reduce profit in the month you made it.
- How often should I count inventory?
- At least annually for the return, and more often if margins matter to your decisions. Quarterly counts catch shrinkage while you can still act on it.
- What is shrinkage?
- The difference between what your records say you hold and what a physical count finds — theft, damage, miscounting or unrecorded sales.
- Do I have to track inventory as a small business?
- Tax rules provide some simplified treatments for smaller businesses. Your CPA determines what applies; operationally you still need to know what you hold.
- What is the most common inventory error?
- Recording purchases directly to cost of goods sold at the time of purchase, which makes both profit and inventory value wrong all year.
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