Key Takeaways
- ROA equals net income divided by average total assets, expressed as a percentage.
- Auditors use ROA under ISA 520 to identify unexpected fluctuations that may signal misstatement in either the income statement or the balance sheet.
- A year-on-year ROA shift exceeding 2–3 percentage points on a stable business warrants documented investigation before the auditor accepts the figure.
- Failing to disaggregate ROA by segment or business unit masks offsetting movements that individually exceed materiality.
What is return on assets (ROA)?
A client's ROA drops two points year-on-year, and the engagement team shrugs because the consolidated number still sits inside the industry band. Three months later, the frozen-foods segment posts a write-down that blows through materiality. That's the scenario ISA 520 analytical procedures are supposed to prevent, and ROA is one of the ratios best suited to catching it early.
ROA connects profitability to the asset base in a single figure, making it sensitive to misstatements on both sides of that equation. A declining ROA can indicate overstated assets (impairment not recognised) or understated income. An improving ROA might reflect aggressive capitalisation policies that inflate profit by deferring costs into the balance sheet. ISA 520.5 requires the auditor to design and perform analytical procedures as substantive procedures when the auditor has determined they'll be effective.
The auditor develops an expectation of what ROA should be ( ISA 520.5 (a)) and compares the recorded ratio to that expectation. Differences exceeding the threshold set during planning require investigation. ISA 520.7 states that the auditor must obtain sufficient and appropriate audit evidence when analytical procedures identify fluctuations inconsistent with the expectation. For ROA, the expectation typically draws on prior-year ROA and industry benchmarks, adjusted for known business changes such as acquisitions or disposals. The DuPont decomposition (splitting ROA into net profit margin multiplied by asset turnover) sharpens the analysis by isolating whether a movement originates from margin changes or asset-base changes.
Worked example: Rossi Alimentari S.p.A.
Client: Italian food production company, FY2025, revenue €67M, IFRS reporter. Rossi reports net income of €4.02M for FY2025. Total assets at 31 December 2024 were €38M; total assets at 31 December 2025 are €42M. The prior-year net income was €3.8M.
Step 1: Calculate ROA for both years
FY2025 ROA = €4.02M / ((€38M + €42M) / 2) = €4.02M / €40M = 10.05%. FY2024 ROA = €3.8M / ((€35M + €38M) / 2) = €3.8M / €36.5M = 10.41%.
Step 2: Develop the auditor's expectation
Rossi's business is stable (no acquisitions, no disposals, no new product lines, no factory closures). The auditor's expectation is that ROA should remain within 0.5 percentage points of the prior year, absent known changes. The industry benchmark for mid-size European food producers is 8–11%.
Step 3: Compare and investigate
Recorded FY2025 ROA is 10.05% against an expected range of 9.9–10.9% (prior-year ROA plus or minus 0.5 percentage points). The recorded ratio falls within the expected range. No further investigation of the ratio itself is required at this level of aggregation.
Step 4: Disaggregate for segment-level insight
Rossi operates two segments: fresh products (revenue €45M) and frozen products (revenue €22M). Segment-level ROA reveals fresh products at 12.3% (up from 11.1%) and frozen products at 5.8% (down from 8.9%). The aggregate ratio masks a 3.1 percentage-point decline in the frozen segment that exceeds the 2 percentage-point threshold for investigation.
If the team had stopped at the consolidated number, the frozen-segment deterioration would have sailed through. Nobody wants to be the one explaining that to a quality reviewer six months later.
Why it matters in practice
At firms like ours, teams apply ROA as an analytical procedure at the consolidated level only and don't disaggregate by segment or business unit. ISA 520 .A13 states that analytical procedures applied to disaggregated data may be more effective than those applied to aggregated financial information. Offsetting segment movements (one improving, one deteriorating) can cancel each other at group level, hiding misstatements that individually exceed performance materiality. That's not analytical procedure work. That's a SALY tick box exercise dressed up as analysis.
The expectation and the acceptable threshold are just as often undocumented. ISA 520.5 (b) requires the auditor to determine the amount of difference from the expectation that's acceptable without further investigation. The FRC (Audit Quality Review 2023/24) flagged insufficient documentation of the auditor's expected value and the precision of analytical procedures as a recurring deficiency across smaller firms.
ROA vs. return on equity (ROE)
| Dimension | ROA | ROE |
|---|---|---|
| Formula | Net income / average total assets | Net income / average shareholders' equity |
| What it measures | How efficiently the entity uses all assets (debt-funded and equity-funded) to generate profit | How efficiently the entity generates returns for shareholders specifically |
| Sensitivity to leverage | Unaffected by capital structure; debt does not distort the ratio | Directly affected by leverage; adding debt can inflate ROE without improving operations |
| Audit use case | Compare operating efficiency across entities with different financing; detect asset-side misstatements | Evaluate equity-side reasonableness; assess going concern indicators when ROE turns negative |
On engagements with significant debt, this distinction matters more than most teams realise. A leveraged entity can show a strong ROE while its ROA reveals declining asset productivity. If the auditor relies only on ROE, the going concern risk from deteriorating asset returns may go unnoticed until the entity can no longer service its debt.
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Frequently asked questions
How do I document ROA as an analytical procedure?
Record four elements: the expectation and its basis (ISA 520.5(a)), the threshold for investigation (ISA 520.5(b)), the recorded value, and the conclusion. If the recorded ROA falls outside the threshold, document the corroborating procedure performed and the evidence obtained per ISA 520.7.
Does ROA work as an analytical procedure for capital-intensive industries?
ROA is less precise for entities with large asset bases that dwarf annual income (real estate, infrastructure). In those sectors, small changes in asset revaluation or depreciation policy produce large ROA swings unrelated to operational performance. ISA 520.A5 notes that the suitability of a particular analytical procedure depends on the nature of the assertion. For capital-intensive entities, asset turnover or return on equity may isolate operational changes more effectively.
When should I use ROA instead of return on equity?
Use ROA when the audit objective relates to asset efficiency or when comparing entities with different capital structures, since ROA is unaffected by the debt-to-equity mix. Return on equity (ROE) reflects returns to shareholders after financing costs and is more useful when the audit focus is on equity-side assertions. ISA 520.A4 permits the auditor to select whichever ratio produces the most meaningful comparison for the engagement.