The audit rate for Americans earning more than $5 million a year plunged to just over 2% in 2019 from over 16% in 2010, according to a recent report from the Government Accountability Office, a federal watchdog. The report estimated that taxpayers underreported their income tax by a combined $245 billion a year between 2011 and 2013, and said that "taxpayers are more likely to voluntarily comply with the tax laws if they believe their return may be audited." The main reason for the decline, according to the report, is a lack of IRS funding. In fiscal year 2021, the agency's budget was $11.9 billion " $200 million less than its 2010 budget. The IRS also has seen its staffing levels fall to the same levels as 1973. The decline in funding and auditors means that taxpayers, and especially the top earners, are far less likely to get caught underpaying their taxes than a decade ago. Overall audit rates for American taxpayers fell to 0.2% in 2019 from 0.9% in 2010. The wealthy are still audited at a higher rate than the general taxpayer population. Yet their audit rates have declined at a much higher rate. The audit rate for taxpayers earning between $5 million and $10 million fell to 1.4% from 13.5%. Those earning more than $10 million saw their audit rate fall to 3.9% in 2019 from 21.2% in 2010, while audit rates for $10 million-plus earners ticked up slightly for the 2017 and 2018 tax years due to a Treasury Department mandate to impose audit rates of at least 8% on those making $10 million or more.