PT - JOURNAL ARTICLE AU - Larrimore, Jeff AU - Mortenson, Jacob AU - Splinter, David TI - Household Incomes in Tax Data AID - 10.3368/jhr.56.2.0718-9647R1 DP - 2021 Mar 31 TA - Journal of Human Resources PG - 600--631 VI - 56 IP - 2 4099 - http://jhr.uwpress.org/content/56/2/600.short 4100 - http://jhr.uwpress.org/content/56/2/600.full SO - J Hum Resour2021 Mar 31; 56 AB - A limitation of tax return data is the inability to identify members of separate tax units living in the same household. We overcome this obstacle and present the first set of entirely tax-based household income and inequality measures. We find using tax units as a proxy for households overstates household income inequality, as measured by Gini coefficients, by 13 percent. Consistent with previous findings, we also estimate that the CPS understates household income inequality by 5 percent. Compared to conventional tax-unit measures, the federal income tax code and earned income tax credit are less progressive when measured at the household level.