KEY POINTS
  • The nation's millionaires and billionaires are evading more than $150 billion a year in taxes, according to the head of the Internal Revenue Service.
  • The IRS, with billions of dollars in new funding from Congress, has launched a sweeping crackdown on wealthy individuals, partnerships and large companies, Commissioner Danny Werfel told CNBC.
  • "We have to make investments to make sure that whether you're a complicated filer who can afford to hire an army of lawyers and accountants, or a more simple filer who has one income and takes the standard deduction, the IRS is equally able to determine what's owed," he said.

A version of this article appeared in CNBC's Inside Wealth newsletter with Robert Frank, a weekly guide to the high-net-worth investor and consumer. Sign up to receive future editions, straight to your inbox.

The nation's millionaires and billionaires are evading more than $150 billion a year in taxes, adding to growing government deficits and creating a "lack of fairness" in the tax system, according to the head of the Internal Revenue Service.