Beyond the Core Ledger: U.S. GAAP Taxonomy Demands Extreme Revenue and Expense Disaggregation

By The Digital Ledger Team • August 24, 2026 • 7 min read

Most finance teams think detailed expense disaggregation is a disclosure problem they can solve in 2026. They're treating it like a footnote exercise. It's not. It's a ledger design problem that starts now. Two new standards, ASU 2023-07 and ASU 2024-03, are forcing finance teams to break open every line on the income statement. Revenue, cost of sales, employee compensation, depreciation. All of it. By segment. By natural category. Down to amounts that are "easily computable" from what the CODM already receives. Single-segment companies aren't exempt. Manual workarounds won't scale. And the 2025 XBRL taxonomy just locked in the technical infrastructure to enforce it. This will expose whether your chart of accounts was built for transparency or convenience. That's what this article breaks down.

Beyond the Core Ledger: U.S. GAAP Taxonomy Demands Extreme Revenue and Expense Disaggregation

1. The End of the "Black Box" Expense

For decades, the financial income statement has worked like a "black box" for many investors. Important operating information was often hidden inside broad categories like "Cost of Sales" or "Selling, General, and Administrative Expenses." This old practice of one-line reporting let companies tell a simple story while keeping the detailed breakdown of their spending away from public view.

That era is officially over. A wave of new regulatory rules, specifically ASU 2023-07 for segment reporting and ASU 2024-03 for the disaggregation of income statement expenses (DISE), is creating a new reality of radical transparency. Finance teams must understand that these are not just small changes. They represent a fundamental shift in how financial data is organized, tracked, and disclosed.

While ASU 2023-07 is already active for fiscal years starting after December 15, 2023 (making it an immediate concern for 2024 annual reports and 2025 quarterly reports), the DISE standard gives companies more time, becoming required for annual periods starting after December 15, 2026. However, the operational workload and necessary control environment adjustments mean that companies cannot afford to wait. In an era of automated analysis, your ledger is no longer just a reporting tool. It is a database for regulators and investors.

2. The "Significant Expense Principle" and the CODM's Shadow

The core requirement of ASU 2023-07 is designed to give investors more detailed expense information at the segment level. The standard introduces the significant expense principle, which requires public companies to disclose significant expense categories and amounts for each reportable segment.

A critical detail of this rule is the shift in the management approach trigger. Previously, disclosure was often tied to what the Chief Operating Decision Maker (CODM) regularly "reviewed." Under the new standard, disclosure is required for expenses that are regularly provided to the CODM, even if the CODM does not regularly review them.

This represents a significant increase in regulatory exposure. Finance teams must immediately review their internal "CODM packages." If a data point is included in that monthly PDF or reporting deck, it is now a strong candidate for public disclosure. This "shadow" of provided information means that companies can no longer rely on the CODM's personal review habits to limit the scope of their financial footnotes.

3. The "Easily Computable" Trap

Standard setters have closed the door on using creative formatting to avoid detailed disaggregation. Under ASU 2023-07, required disclosures include not only actual amounts provided to the CODM but also expenses that are easily computable from provided information.

This "substance over form" approach prevents companies from hiding expenses behind ratios or related metrics. Examples of the "easily computable" trap include:

Cost of Sales: If the CODM receives revenue and gross margin data, cost of sales is considered easily computable and must be disclosed if significant.
Warranty Expense: If provided as a percentage of revenue, the actual dollar amount is considered computable.
Interest Expense: According to Deloitte and FASB guidance, if the CODM receives net interest margin and interest revenue, the interest expense must be separated and disclosed.

Companies must use professional judgment to identify these items, but the standard is clear: if the math is simple, the disclosure is mandatory.

4. The "Single Segment" Fallacy

There is a common misconception that companies operating with a single reportable segment are exempt from these enhanced disclosure rules. The FASB and SEC have explicitly clarified that this is false.

Single-segment companies must provide all disclosures required by ASU 2023-07, including significant segment expenses. The SEC's logic is clear: if a company is managed on a consolidated basis, consolidated net income is often the measure of profit or loss most consistent with U.S. GAAP. This trigger effectively forces the disaggregation of the entire consolidated income statement under segment rules, treating the whole company with the same level of detail as a multi-segment enterprise.

5. The "Big Five" of DISE (ASU 2024-03)

While segment reporting focuses on the management approach, ASU 2024-03 (the DISE standard) introduces a requirement for all public business entities to disaggregate any relevant expense caption (any item on the face of the income statement within continuing operations) into five specific natural categories:

Purchases of Inventory
Employee Compensation
Depreciation
Intangible Asset Amortization
DD&A (Depreciation, depletion, and amortization for oil and gas-producing activities)

When a relevant expense caption contains these elements, the company must provide a table breakdown. To offer relief, the FASB included practical expedients: for "Purchases of Inventory," a company may qualitatively describe the caption if it represents substantially all of the expense. Similarly, companies presenting "Salaries and Employee Benefits" per ASC 942-330-S99-1 may use those existing amounts to comply.

As FASB Chair Richard R. Jones noted in his 4Q 2024 report:

"Additional expense information [will help] investors better assess financial trends, perform more precise financial modeling when forecasting the components of an individual segment's profit or loss, [and make an overall evaluation of] an entity's business activities."

6. The 2025 XBRL Digital Backbone

The technical implementation of these standards is tied to the SEC's digital infrastructure. On March 17, 2025, the EDGAR system was upgraded to Release 25.1, supporting the 2025 taxonomies.

This transition is a technical "lock-in." Each 2025 taxonomy is compatible only with other 2025 versions. Key updates include:

Open-End Fund (OEF) Taxonomy: The addition of a Coregistrant axis, allowing a single filing for multiple trusts under different CIK numbers.
SPAC Taxonomy: Elements for enhanced disclosures regarding initial public offerings and de-SPAC transactions.
Cybersecurity Disclosure (CYD): Specialized tags for new cybersecurity reporting requirements.

For reporting periods ending on or after March 17, 2025, transitioning to the 2025 taxonomies is a regulatory necessity to take advantage of the most up-to-date tags related to these new accounting standards.

7. Systemic Readiness vs. Manual Workarounds

The administrative burden of these changes is substantial. Current financial reporting systems often do not track data at the level of detail required by Subtopic 220-40. For example, many ledgers do not automatically tag "employee compensation" when it is embedded within various functional departments like R&D or Marketing.

While the standards allow for the use of estimates or other methods that "reasonably approximate" the required amounts, this is a temporary bridge. As BDO insights suggest, updating recordkeeping to capture these natural expense categories is a multi-year project. Companies must move beyond manual workarounds toward a robust control environment that can provide data-integrity-level precision for every footnote.

8. Closing: The Forward-Looking Summary

Financial reporting is fundamentally moving from "telling a story" to "providing a database." Investors and regulators no longer accept aggregated summaries. They demand the raw, disaggregated components of performance. With the 2025 taxonomies now live and the segment reporting mandates already in effect, the burden is on the preparer to ensure their systems are ready for this radical transparency.

Beyond the Core Ledger: U.S. GAAP Taxonomy Demands Extreme Revenue and Expense Disaggregation

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