Although IRS audit continue to get reduced for various reasons (short-staffed for one) computer generated audits are rammed up:
2017 Individual audit rates overall was .6% (1 of 167)
Earned Income Credit filers: over 1%
Schedule C returns: 1% – 2.1%, especially with gross receipts over $25,000.
Income over $200,000 and no Schedule C: .8% audit rate
with a Schedule C over $200K 1.6%
Millionaires 4.4%
C Corps– 1%
S Corps .3% (lowest)
Partnerships .4%