Non‐GAAP Earnings: A Consistency and Comparability Crisis?*

ABSTRACT We use a novel data set to examine the across‐time consistency and across‐firm comparability of firms' non‐GAAP earnings disclosures. Given widespread concern about non‐GAAP reporting among regulators, standard setters, the investor community, and academics, our investigation provides timely evidence on how managers' deviations from their own non‐GAAP disclosure history, or the reporting of industry peers, affects how well earnings inform on firm performance. We begin by identifying firms that change their non‐GAAP earnings definition from one year to the next. These deviations are uncommon, but when managers change the items they exclude in calculating non‐GAAP earnings, the changes generally enhance the information in earnings about firms' core performance. We also examine whether non‐GAAP earnings are more comparable than GAAP earnings and find that firms' non‐GAAP adjustments result in greater earnings comparability. Finally, we examine instances in which firms deviate from common sector‐wide definitions of non‐GAAP earnings. We find that these deviations also result in earnings metrics that better represent firms' core operations. Overall, our results suggest that when managers vary their non‐GAAP calculations, either across time or across firms, the resulting non‐GAAP metrics generally enhance the information in earnings about firms' ongoing performance. Thus, our analysis helps mitigate concerns about why managers might vary their non‐GAAP reporting calculations.