IRS said increased enforcement of millionaires with tax debt netted $1 billion

The IRS has successfully collected over $1 billion in tax debt from wealthy individuals. Last year, the agency announced plans to intensify efforts to ensure that individuals earning more than $1 million annually pay their taxes. However, the IRS has faced resource constraints over the past decade, limiting its ability to pursue high-income individuals who owe taxes.

What income threshold did the IRS set for ensuring tax payments?

What challenges did the IRS face in the previous decade regarding high-income individuals?