Does measured top income inequality reflect business income reclassification?
Core argument: Most of the post-2000 increase in top income shares is concentrated above the 99.99th percentile (~$7.2m in 2012), and excluding that group leaves top income shares with little growth over the past 20 years.
Since 2000, top income inequality trends have diverged based on income type. Total income measures show a rise in top income shares, while wage and salary income measures show no post-2000 increase. The key driver is S-corporation income, which complicates interpretation as it often represents income previously classified under C-corporations. This shift does not reflect new earnings but a reclassification of existing income. The majority of the increase in top income shares is concentrated at extremely high levels, specifically above the 99.99th percentile (~$7.2m in 2012). Excluding these, top income shares have seen little growth over the past 20 years, indicating that the perceived rise in inequality is largely due to changes at the very top of the income distribution.


