The reason for this is almost entirely the Earned Income Tax Credit. The IRS estimates 21-26% of all EITC claims are improper. The rules are quite complex, which results in more errors and it is relatively straightforward for the IRS to detect certain classes of mistake or fraud through automation (i.e. to detect if the same child was claimed as a dependent by two different people on their return). Congress made the…
They ignore much larger sums. The real reason they’re targeted is that, quite simply, they’re unable to fight back. It’s the equivalent of searching for your keys under the streetlight.
> A critical limitation in the IRS’s ability to audit millionaires is the availability of IRS revenue agents. Only this class of auditors, given sufficient training and experience, are qualified to examine complex tax returns – the types of returns typically filed by high-income individuals and large-scale businesses.
> With severe budget constraints, IRS has tended to trade off the replacement of revenue agents with hiring more tax examiners. These certainly are paid less, but they are also less knowledgeable. While revenue agents used to outnumber tax examiners, this has slowly shifted over time.