ABSTRACTA fundamental property of accrual accounting is to smooth temporary timing fluctuations in operating cash flows, indicating an inherent negative correlation between accruals and cash flows. We show that the overall correlation between accruals and cash flows has dramatically declined in magnitude over the past half century and has largely disappeared in more recent years. The adjusted R 2 from regressing (changes in) accruals on (changes in) cash flows drops from about 70% (90%) in the 1960s to near zero (under 20%) in more recent years. In exploring potential reasons for the observed attenuation, we find that increases in non‐timing‐related accrual recognition, as proxied by one‐time and nonoperating items and the frequency of loss firm‐years, explain the majority of the overall decline. On the other hand, temporal changes in the matching between revenues and expenses, and the growth of intangible‐intensive industries play only a limited role in explaining the observed attenuation. Finally, the relative decline of the timing role of accruals does not appear to be associated with an increase in the asymmetrically timely loss recognition role.