Depreciation in COGS: Production Asset Cost in Gross Profit

Key Takeaways

• Depreciation tied to production assets is capitalized into inventory under ASC 330.
• It hits COGS only when the related units are sold, not when the expense accrues monthly.
• Investors often overstate EBITDA by adding back all depreciation rather than only the COGS portion.
• High capex industries carry large embedded depreciation that swings with capacity utilization.

What It Is

Depreciation in cost of goods sold is the share of total depreciation expense that relates to property, plant, and equipment used directly in manufacturing or service delivery. Examples include depreciation on production machinery, an assembly line, the factory building itself, refining equipment, mining trucks, and quality-control instruments.

Under FASB ASC 330, all manufacturing overhead, including the depreciation of production assets, must be capitalized into inventory under full absorption costing. The expense first lands in work-in-process inventory through the overhead allocation, then moves to finished-goods inventory, then to cost of goods sold (COGS) when the unit is sold.

Depreciation on non-production assets (corporate headquarters, sales-team vehicles, IT for the finance department) follows a different path. It hits selling, general, and administrative expense in the period it accrues.

The Intuition

A factory spends $100 million on a stamping press with a 20-year useful life. Straight-line depreciation gives $5 million of expense per year. But if half the press's output sits in inventory at year end, only half the $5 million has reached COGS. The other half rides along with the inventory on the balance sheet.

The logic is the matching principle. Depreciation is the cost of using up a long-lived asset. If you used the asset to make a unit and the unit has not sold, the cost has not yet earned a matching revenue. It belongs in inventory until the sale.

This treatment also means depreciation per unit moves with production volume. At full utilization, fixed depreciation spreads thin and per-unit cost is low. At low utilization, the unit cost rises, and any unallocated depreciation from excess capacity gets expensed directly.

How It Works

Companies first identify which assets serve production and which serve other functions. Production-asset depreciation enters factory overhead and is allocated to units using the chosen base (machine hours, direct labor hours, or units of output).

Depreciation in COGS this period = Production depreciation allocated x % of related units sold

US GAAP requires fixed-overhead allocation based on normal capacity. If actual production drops far below normal, some of the production depreciation becomes unabsorbed. ASC 330 directs that unabsorbed amount to be expensed in the current period rather than capitalized into the small number of units actually produced.

Public filers must disclose total depreciation expense, often split between depreciation in COGS and depreciation in SG&A. The cash flow statement and the property, plant, and equipment footnote provide the full picture even when the income statement does not break it out.

Worked Example

A chemical producer has $500 million of net production property and equipment depreciating at 8% per year, giving $40 million of annual production depreciation. Corporate office and IT depreciation adds another $5 million.

In a normal year, the plant produces 1,000,000 tons and sells 950,000 tons. The $40 million of production depreciation is allocated at $40 per ton produced. Depreciation in COGS equals 950,000 x $40 = $38 million. The remaining $2 million sits in finished-goods inventory and rolls into the next period.

In a downturn, the plant runs at 60% of normal capacity, producing 600,000 tons. If management still recognizes the standard $40 per ton on actual production, only $24 million of the $40 million annual depreciation is absorbed. The other $16 million must be expensed as unabsorbed overhead, hitting COGS directly even though production was low.

EBITDA in this downturn year adds back the full $45 million of depreciation. Operating income reflects the unabsorbed charge. Investors using EBITDA without understanding absorption mechanics may miss the underlying margin pressure.

Common Mistakes

1. Adding back all depreciation to compute EBITDA. That is the correct calculation, but it can mask absorption issues. The COGS-embedded portion is what matters for understanding gross margin behavior.
2. Ignoring the inventory-driven lag. Depreciation accrues monthly but reaches COGS only when units sell. A capex-heavy build for new capacity may carry months of depreciation in inventory before showing up in earnings.
3. Confusing accelerated tax depreciation with book depreciation in COGS. Tax depreciation rules (MACRS, bonus depreciation) affect cash taxes, not the COGS line on the GAAP income statement.
4. Missing the unabsorbed charge in downturns. When utilization falls below normal capacity, a chunk of depreciation hits the period directly. This is one of the biggest sources of cyclical gross margin compression.
5. Treating service-industry depreciation as if it were manufacturing. A SaaS company's data-center depreciation may sit in cost of revenue rather than SG&A. Read the accounting policy footnote before benchmarking.

Frequently Asked Questions

What is depreciation in COGS in simple terms? It is the part of a company's total depreciation expense that relates to factory equipment and production buildings. GAAP requires this depreciation to be loaded into inventory and only hit the income statement when the related units are sold.

How does depreciation in COGS affect investment decisions? For capex-heavy businesses, embedded depreciation is a major chunk of gross margin. Modeling it correctly is essential for cyclical forecasts because absorption shifts can move gross margin more than revenue moves.

What is a real-world example of depreciation in COGS? A semiconductor fab depreciates a $5 billion lithography line over ten years. The annual $500 million of depreciation gets allocated across every wafer produced and forms a major component of gross margin sensitivity to capacity utilization.

How can investors avoid misreading depreciation in COGS? Find total depreciation in the cash flow statement, then check the PP&E footnote for the split between COGS and SG&A. Adjust EBITDA-based valuations when absorption charges materially distort current-period operating income.

How is depreciation in COGS different from depreciation in SG&A? COGS depreciation relates to production assets and is capitalized into inventory. SG&A depreciation relates to administrative and selling assets and is expensed in the period it accrues, with no inventory lag.

Sources

1. FASB. ASU 2015-11, Inventory (Topic 330). https://storage.fasb.org/ASU%202015-11.pdf
2. PwC Viewpoint. Inventory costing guide. https://viewpoint.pwc.com/dt/us/en/pwc/accounting_guides/inventory/Inventory-Guide/Chapter-1-Inventory-costing/1_3_Cost.html
3. Clark Nuber. U.S. GAAP: How to Allocate Overhead When Production Drops. https://clarknuber.com/articles/u-s-gaap-how-to-allocate-overhead-when-production-drops/
4. AccountingCoach. Manufacturing Overhead Explanation. https://www.accountingcoach.com/manufacturing-overhead/explanation

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.