Cost of Goods Sold vs. Operating Expense: Where the Line Goes and Why Gross Margin Depends on It

Cost of goods sold

Cost of goods sold is the direct cost of the products or services a business actually sold in a period, as distinct from operating expense, which is the cost of running the business whether or not anything sold. Revenue minus cost of goods sold is gross margin, and that number only means something when the same costs sit on the same side of the line every month.

Every dollar a business spends on its income statement ends up in one of two places. Either it was spent to produce or buy the specific thing that was sold, or it was spent to keep the business running. The first group is cost of goods sold. The second is operating expense. Nothing about a cost's name decides which side it lands on. A wage can be either. Rent can be either. Depreciation can be either. What decides is whether the cost rises and falls with what you sold, or with the fact that you are open.

The reason this split matters is a single number: gross margin. Revenue minus cost of goods sold tells you what is left to pay for everything else. A business with a 40 percent gross margin and a business with a 20 percent gross margin need very different operating cost structures to survive, even at the same revenue. If direct costs drift into operating expense, gross margin looks better than it is. If overhead drifts into cost of goods sold, it looks worse. Either way the number stops telling you anything, and the total profit at the bottom is identical, so nothing on the surface warns you.

Structure

A chart of accounts makes the split permanent by giving each side its own number range. Cost of goods sold accounts sit in the 5000s, directly below revenue. Operating expense accounts sit in the 6000s. Once an account has a number, every transaction coded to it lands on the same side of gross margin, and the income statement draws the line without anyone deciding each month. Read the account numbering guide for how the full range system works.

The default QuickBooks chart does not force this. It gives you an account type called Cost of Goods Sold, but many businesses start with a single Cost of Goods Sold account and pile every other cost into one long list of expenses. The change that makes gross margin usable is the one below.

Two of those rows show the rule in action. Freight in, the cost of getting goods to you, is part of what the goods cost, so it sits in the 5000s. Freight out, the cost of shipping a sale to a customer, is a selling cost and sits in the 6000s. Same word, opposite sides of the line, because one cost attaches to the product and the other attaches to the sale.

Recording

The split is decided at the moment a cost is coded, not when the report runs. Consider a small furniture maker that buys 3,200 dollars of lumber and pays 180 dollars to have it delivered. Both costs attach to the product, so both go to cost of goods sold accounts. Figures are illustrative.

The same week the business pays 2,400 dollars of office rent and 350 dollars to run an online ad. Neither cost changes with how many tables were built or sold. They go to operating expense accounts.

If the business tracks inventory, the materials in Entry 1 would first go to an inventory asset account and move to cost of goods sold when the table sells. That timing question is covered in the account types guide. The side of the line does not change: whenever the cost reaches the income statement, it reaches it as cost of goods sold.

Reporting

The income statement is where the split pays off. A simple, single-step statement lists all revenue, then all expenses, and gives one profit number. A multi-step statement deducts cost of goods sold first, shows gross margin as its own line, then deducts operating expense to reach income from operations. The 5000 and 6000 ranges are what let the report do that without manual sorting.

Gross margin here is 21,460 on 48,000 of sales, or about 45 percent. That figure is what an owner compares month to month, what a lender compares against other businesses in the same trade, and what tells you whether a pricing problem or a spending problem is eating the profit. Move the 720 dollars of delivery expense up into cost of goods sold and the margin drops to about 43 percent. Move direct labor down into operating expense and it jumps to about 64 percent. Income from operations is 9,080 in all three cases. The line moved; the profit did not; the ability to read the business did.

Under GAAP (Generally Accepted Accounting Principles) there is no fixed list of which costs belong in cost of goods sold. The standard asks that the presentation be consistent and that costs be matched to the revenue they produced. The practical rule is the one this page keeps repeating: choose the line once, number the accounts so the line is enforced, and do not move it.

Insight

Where the line goes in a particular trade is the subject of the industry guides built on this foundation. Each one lists the specific 5000-series accounts for that business and the costs that belong in them. To see whether your own chart draws the line, and where it does not, try the free demo →.