Sloan Accrual Ratio

Richard Sloan's seminal 1996 paper published in The Accounting Review documented what became known as the 'accrual anomaly': stocks of companies with high accrual components in their reported earnings subsequently underperformed stocks of companies whose earnings were primarily cash-based. The paper argued that investors systematically overestimated the persistence of accrual-based earnings and underestimated the persistence of cash-based earnings, creating a predictable mispricing that could be exploited.

The balance sheet version of the accrual ratio measures the change in net operating assets as a proportion of average total assets. Net operating assets equal total operating assets minus total operating liabilities — the net capital tied up in the operating business, excluding financing items. When net operating assets grow faster than earnings — meaning the business is absorbing capital through expanding receivables, inventory, or capitalized costs — the accrual ratio is high, signaling that earnings are being supported by non-cash accounting entries rather than cash generation.

The cash flow version of the accrual ratio is more directly interpretable: it computes net income minus operating cash flow, divided by average net operating assets. This version directly measures how much of reported net income represents accruals — the gap between what was reported and what was actually collected in cash. A company earning $100 million in net income while generating only $60 million in operating cash flow has $40 million in accruals, representing expenses recognized but not yet paid, or revenue recognized but not yet collected.

High accrual ratios can arise from legitimate business expansion — a rapidly growing company naturally accumulates more receivables as it scales — or from aggressive accounting practices such as premature revenue recognition, deferred expense capitalization, or reserve manipulation. Distinguishing growth-driven accruals from manipulation-driven accruals requires contextual analysis: examining whether receivables growth is consistent with revenue growth rates, whether inventory days are expanding without clear justification, and whether management guidance explains the working capital dynamics.

The accrual anomaly has been partially arbitraged away since Sloan's publication, as institutional investors and quantitative funds began systematically exploiting the signal. However, studies continue to find statistically significant predictive power for the accrual ratio across international markets, suggesting the underlying behavioral bias — overweighting accrual-based earnings persistence — persists in aggregate investor behavior.