> The percentage of people itemizing was 30%, but with the Trump Tax Cut which capped state and local deductions (i.e. lowered the maximum allowable deduction, effectively increasing taxes on a large number of people) this was predicted to drop to 10%.

11.4% of tax filers itemized in 2018:

https://www.irs.gov/statistics/soi-tax-stats-tax-stats-at-a-...