Tax Policy Center reports generally:
About 65 percent of households paid less in individual income taxes in 2018 as a result of the TCJA. About 6 percent paid more. The rest paid about the same.
Results by income level are in Table 2 of the full report:
Bottom quintile (< $25k): 27% reduced; 1% increased
Second quintile ($25-47k): 65% reduced; 6%...