A large portion of that auditing is fraud/error involved in earned income tax credits, where you get paid special credits to make less money. Also for various

A large portion of that auditing is fraud/error involved in earned income tax credits, where you get paid special credits to make less money. Also for various reasons, being poor can often go hand in hand with being both unable to file a return in a way that looks correct and being unable to hire a professional to do it on your behalf. There is an incentive to look poor even if you are not so poor, when filing taxes. It's those who file as poor who aren't so poor, not those who are as poor as they say, that are the more likely culprit of these audits.