Reply: Trends in US Income and Wealth Inequality: Revising After the Revisionists
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US federal tax rates remain progressive, with negligible rates for the bottom quintile, 11-16% for the middle quintile, and about 33% for the top 1%.
Just an FYI, David Splinter updated his work in response to a critique from PSZ and contrasts it with other high quality estimates (CBO) and finds that AS estimate of the pre-tax income of top one percent increasingly 3.6pp btw 1988-2015 is consistent with CBO 3.4pp.
He also confirms that the tax code has grown more progressive,”…. In AS, we found that top average tax rates have changed little since the early 1960s while bottom 50 percent average tax rates have fallen substantially... Between 1979 and 2016, top quintile rates decreased by about 1 percentage point, middle quintile rates decreased by about 5 percentage points, and bottom quintile rates decreased by about 8 percentage points. The larger decrease at the bottom of the distribution means tax progressivity increased….”
See his Figure 1, “…Mainstream estimates show that federal taxes are progressive in recent years. Figure 1 displays estimates of average tax rates by income from Piketty and Saez (2007), the Congressional Budget Office (CBO, 2019), the Joint Committee on Taxation (JCT), Treasury’s Office of Tax Analysis (OTA), and the Urban-Brookings Tax Policy Center (TPC). These estimates, as well as those from AS (which have lower levels due to the inclusion of additional untaxed income sources), are broadly consistent with one another: negative or negligible tax rates for the bottom income quintile, 11 to 16 percent for the middle quintile, and about 33 percent for the top one percent…..”

On the increase in 1% share of pre-tax income, "......Bricker et al. (2016) used Survey of Consumer Finance data. Between 1988 and 2012, they found a top one percent share increase of 3 percentage points (pp). The AS pre-tax increase of 3.6pp resembles thisand the PSZ pre-tax increase of 6pp exceeds it. The Congressional Budget Office (2019) used tax return and survey data. Between 1988 and 2015, CBO found that the top one percent share of pre-tax income increased 3.4pp. The AS pre-tax increase of 2.5pp is a bit lower and the PSZ pre-tax increase of 5pp exceeds it.16 Burkhauser et al. (2012) used internal Census data to overcome top-coding issues. Between 1967 and 2004, they found a top one percent share increase of 2pp. The AS pre-tax increase of 2pp is similar and the PSZ pre-tax increase of 5pp exceeds it..."
He also reiterates that the tax code has become more progressive, "….Recent estimates also show increasing tax progressivity. In AS, we found that top average tax rates have changed little since the early 1960s while bottom 50 percent average tax rates have fallen substantially... Between 1979 and 2016, top quintile rates decreased by about 1 percentage point, middle quintile rates decreased by about 5 percentage points, and bottom quintile rates decreased by about 8 percentage points. The larger decrease at the bottom of the distribution means tax progressivity increased. SZ contrasted this finding with the much higher marginal tax rates for individual income taxes in the 1960s. But very few people paid those top rates. For example, fewer than 500 tax returns paid the top marginal rate in 1962.15 The reason top average tax rates (total taxes of an income group divided by their income) are lower than expected in the 1960s is that a significant share of top one percent income was not reported on individual tax returns, largely due to corporate retained earnings. This explains why measures using national accounts by Pechman (1985), AS, and PSZ, found that the 1966 average federal income tax rate for the top one percent was between 14 and 16 percent. The stability of top tax burdens over time is because falling statutory rates were offset by an increasing share of top incomes being taxable...."

David Splinter, "Reply: Trends in US Income and Wealth Inequality: Revising After the Revisionists," Working Paper, November 17, 2020, http://www.davidsplinter.com/Splinter2020-SaezZucmanReply.pdf


