Depreciation expense appears in one of three places on the income statement, and the asset’s role in the business decides which one: cost of goods sold for equipment used in production, operating expenses (within selling, general, and administrative costs) for assets that support the business but don’t make the product, and the non-operating section for assets unrelated to the core business.
Production Assets: Cost of Goods Sold
Depreciation on a manufacturing machine, conveyor, or other production equipment becomes part of what each unit costs to make. It doesn’t hit the income statement when the machine wears down. It hits when the product sells.
The mechanics work like this. Production depreciation is absorbed into inventory on the balance sheet alongside raw materials and direct labor. When a finished unit sells, its full absorbed cost, depreciation included, transfers out of inventory and into cost of goods sold. Manufacture 10,000 units, sell 8,000, and only the depreciation allocable to those 8,000 flows through COGS this period. The rest waits in inventory until those units move.
This treatment follows GAAP’s requirement that all production costs, including indirect overhead like equipment depreciation, be capitalized into inventory rather than expensed immediately. Under absorption costing, every unit absorbs a share of fixed manufacturing overhead. It is the only method acceptable for external financial reporting.
Some companies present depreciation as a separate line on the income statement instead of leaving it inside COGS. When they do, SEC guidance requires the cost of sales line to be labeled accordingly, such as “Cost of sales, exclusive of depreciation shown separately below,” and the company cannot present a gross margin that ignores the excluded depreciation. Watch for that label when reading financial statements. It means the gross profit figure isn’t directly comparable to a competitor that embeds depreciation inside COGS.
The Parallel Tax Rule
For tax purposes, similar capitalization applies under Section 263A of the Internal Revenue Code. Manufacturers must capitalize direct and indirect production costs, including depreciation on production equipment, into inventory rather than deducting them immediately.1Office of the Law Revision Counsel. 26 U.S. Code 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses Smaller businesses under the gross receipts threshold are generally exempt and can follow simpler inventory accounting.2Internal Revenue Service. Section 263A Costs for Self-Constructed Assets
Administrative and Selling Assets: Operating Expenses
Depreciation on assets that support the business but aren’t involved in production hits the income statement immediately, inside selling, general, and administrative costs. Office furniture, accounting-team computers, corporate headquarters buildings, and vehicles assigned to sales staff all generate depreciation that belongs here.
These are period costs. They’re tied to a span of time rather than to a specific product, so you record the expense in the month it occurs with no inventory detour. For service companies, retailers, and tech firms that don’t manufacture physical goods, this is where nearly all their depreciation lives. A software company’s servers, a law firm’s office buildout, a consulting firm’s laptops: all operating-expense depreciation.
The distinction between selling expenses and general and administrative expenses matters for internal analysis even when the income statement groups them together. Depreciation on delivery trucks or sales display equipment is a selling expense. Depreciation on the finance department’s office furniture is a general and administrative expense. Both reduce operating income, but tracking them separately shows management where resources are actually going.
SG&A depreciation reduces operating income directly. That’s the profitability metric capturing how well the core business performs before financing costs and taxes.
Non-Core Assets: The Non-Operating Section
If your business owns assets that have nothing to do with its primary operations, the depreciation on those assets belongs in the non-operating section of the income statement, below operating income and above income before taxes.
The classic example is a tech company that owns an apartment building as an investment. The depreciation on that building is real, but it has nothing to do with the company’s ability to develop and sell software. Mixing it into operating expenses would inflate operating costs and distort the operating margin, misleading anyone evaluating the core business. The same logic applies to idle equipment awaiting sale, surplus real estate leased to a third party, or assets held by a subsidiary in an unrelated industry.
The non-operating section also houses interest income, interest expense, and gains or losses on asset disposals. Grouping non-core depreciation here lets readers isolate the company’s sustainable earning power from incidental items. A large non-operating depreciation charge is worth investigating: what does the company own outside its main line of business, and are those assets earning enough to justify holding them?
Book Depreciation vs. Tax Depreciation: Same Location, Different Amount
The depreciation on your financial statements and the depreciation on your tax return are almost always calculated differently, and they don’t need to match. Understanding this split explains why the income tax expense on your income statement rarely equals the cash you actually send to the IRS.
For financial reporting, most companies use straight-line depreciation, spreading the asset’s cost evenly over its estimated useful life. A $100,000 machine with a 10-year life produces $10,000 of depreciation a year for a decade. The useful life is management’s best estimate.
For tax purposes, the standard method is MACRS, the Modified Accelerated Cost Recovery System.3Internal Revenue Service. Depreciation Frequently Asked Questions MACRS front-loads the deduction: larger write-offs early, smaller ones later. Recovery periods are prescribed by asset class. Office furniture gets 7 years, nonresidential real property gets 39, and you don’t substitute your own estimate.4Internal Revenue Service. Publication 946 – How To Depreciate Property
The mismatch creates a temporary difference. In early years, tax depreciation typically exceeds book depreciation, cutting taxable income more than book income. In later years, the reverse. The cumulative gap shows up as a deferred tax liability on the balance sheet.
Here is the important point for placement: both methods place depreciation in the same functional location. COGS for production assets, SG&A for administrative and selling assets, and non-operating for everything else. The same holds for accelerated deductions like Section 179 expensing, bonus depreciation under Section 168(k), and the de minimis safe harbor. Those provisions change how fast the cost is written off, not where it sits. The method changes only the annual amount, never the location on the income statement.