"How would you assess the quality of this company's earnings?" is a question that trips up candidates who only know how to read an income statement top to bottom. It's really testing something different: can you connect the income statement to the cash flow statement and spot when they're telling two different stories?

Step 1: State What You're Comparing

Start by naming the two numbers you're going to compare and why: net income (the accrual-accounting profit figure) and cash flow from operations (the actual cash the business generated). Say explicitly that a gap between them, if it's growing, is the first thing worth investigating.

Step 2: Calculate the Accruals Ratio

The formula is straightforward: (Net Income − Cash Flow from Operations) ÷ Average Total Assets. Walk through it out loud with the numbers you're given — for example, in our full worked case, a company's accruals ratio moves from 0.6% to 4.5% across two years, even though net income itself rose. State the result, then immediately interpret it: a rising accruals ratio means a growing share of profit is coming from accounting judgment rather than cash generation.

Step 3: Check Cash Conversion and the Growth Divergence

Next, calculate cash flow from operations divided by net income for each period, and compare the year-over-year growth rate of net income to the year-over-year growth rate of free cash flow (cash flow from operations minus CapEx). In the same worked example, net income grows 16.7% while free cash flow falls 33.3% — a textbook divergence that a strong candidate will flag immediately as the core red flag, not a footnote.

Step 4: Don't Stop at the Numbers

A candidate who only recites ratios sounds like a calculator. Add the qualitative layer: mention that you'd also check for an auditor change, a qualified or emphasis-of-matter opinion, a late filing, related-party transactions, or a prior restatement — signals that often move in the same direction as the ratios, sometimes earlier.

Common Mistakes to Avoid

Don't focus only on net income growth and skip the cash flow statement entirely — that's the single most common failure in this question. Don't treat one weak year as automatic proof of manipulation; ask whether it's explained by legitimate growth-driven working capital investment instead, a distinction covered in depth in our working capital deep dive. And don't forget to average beginning and ending total assets in the accruals ratio denominator rather than using a single period-end balance.

Bringing It Together

A strong answer takes about 90 seconds: name the comparison, calculate the accruals ratio and cash conversion ratio, flag the growth divergence between net income and free cash flow, then layer in the qualitative signals. For the complete numbers, formulas, and follow-up questions an interviewer might ask next, work through the full Earnings Quality: Red Flags case.