In recent years, the IRS has cut staff by 24,000 employees. Its revenue agents in Fiscal Year 2010 numbered 14,000. By FY 2017, they had been reduced to fewer than 10,000, the lowest level since 1953. The agency budget is down 16 percent since 2011. Because of shrinking resources, the IRS audit rate has fallen by half to 630,000 fewer last year than in 2011. Yet the return rate on audits is profitable — every audit-dollar spent returns $6. For incomes of $1 million or more, one in six used to get audited; now it’s fewer than 1 in 20.