Individual Returns:

Audits of all individual income tax returns
IRS Audits of Taxpayers Reporting > $1 Million in Income

Corporate Returns:

Audit rates for largest corporations
Audits of all corporations
IRS Audits of Corporations with $20 Billion or More Assets

Collection Enforcement:

Levies, liens and seizure activity resuming

Criminal Enforcement:

Odds of IRS referral for criminal prosecution