What is Expense Disaggregation?
Expense disaggregation is the process of breaking a broad expense caption into more specific categories that explain what the company actually spent money on.
A line such as cost of sales, selling, general and administrative expense, or research and development expense can combine several economically different costs. Those costs may include Employee Compensation Expense, inventory purchases, depreciation, intangible-asset amortization, rent, outside services, advertising, or other items.
For an investor, the point of disaggregation is not simply more accounting detail. It is to understand the cost structure underneath reported margins and to separate costs that may have different drivers, persistence, and sensitivity to revenue.
Why broad expense captions can hide useful information
Two companies can report the same operating margin while having very different cost structures.
One business may rely heavily on payroll and stock-based compensation. Another may have a larger inventory component. A third may have substantial depreciation because it owns capital-intensive infrastructure. If those costs are bundled into one line, the headline margin does not reveal how the economics differ.
Disaggregation can therefore help investors ask better questions about:
- operating leverage and fixed-versus-variable cost behavior;
- labor intensity;
- capital intensity;
- inventory exposure;
- acquisition-related amortization;
- margin durability; and
- whether peer companies classify similar costs in comparable ways.
Disaggregation does not make those judgments automatically. It gives the analyst more components to interpret.
ASU 2024-03 and the new U.S. disclosure framework
FASB issued ASU 2024-03 after investors asked for more granular information about expenses such as cost of sales and SG&A. The standard requires public business entities to provide specified expense detail for relevant income-statement captions.
Among other items, companies will disclose amounts for purchases of inventory, employee compensation, depreciation, intangible-asset amortization, and certain oil-and-gas depreciation, depletion, and amortization when those categories are included in a relevant expense caption. Companies also must disclose total selling expenses and, annually, how they define selling expenses.
The annual requirements are effective for reporting periods beginning after December 15, 2026, with interim requirements beginning later. Early adoption is permitted.
That timing matters for current research, but the analytical concept is broader than one accounting update. Investors have always benefited from understanding what sits inside an expense line.
Natural versus functional views of expense
Expense detail can be organized in different ways.
A Natural Expense Classification groups costs by what was consumed or paid for, such as wages, rent, depreciation, utilities, or outside services.
A Functional Expense Classification groups costs by the business activity they support, such as Cost of Goods Sold, selling, administration, or research and development.
The same natural cost can appear inside more than one functional caption. Employee compensation, for example, can be included in manufacturing, sales, engineering, or administrative functions.
That is why a disaggregation table can be analytically useful: it can reveal natural cost components that are otherwise embedded inside broad functional captions.
What expense disaggregation does not tell you
More detail does not create perfect comparability.
Companies can organize their operations differently, define selling activities differently, and have different judgments about where certain costs belong. Some required categories also may not explain the entire residual amount inside a caption.
Investors should avoid assuming that:
- every undisclosed remainder is immaterial;
- similar labels imply identical cost composition;
- a larger compensation number is automatically worse than a smaller one;
- depreciation is economically equivalent to a current cash outflow; or
- a regulatory disclosure is a forecast of future expenses.
The disclosure is historical accounting information. Forecasting still requires business-model judgment.
A simple analytical example
Suppose two companies each report $400 million of SG&A.
Company A's SG&A includes $260 million of employee compensation, $20 million of depreciation and amortization, and $120 million of other costs. Company B reports $120 million of employee compensation, $10 million of depreciation and amortization, and $270 million of other costs.
The identical $400 million headline hides materially different labor intensity and cost composition. An analyst trying to model wage inflation, restructuring risk, automation potential, or margin sensitivity would likely treat the companies differently.
Expense disaggregation does not supply the conclusion. It improves the inputs available for forming one.
Sources and further reading
- FASB: Disaggregation of Income Statement Expenses completed project summary
- FASB: ASU 2024-03, Disaggregation of Income Statement Expenses
- FASB: ASU 2025-01, Clarifying the Effective Date
- CFA Institute: Analyzing Income Statements
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