“SOME” is not a technical term. It can mean between 1% and 99%. Look for 99% of new IRS audits to be against the middle class.
That number is too high. Many of the audits will be against poor people as well. It turns out that right now the IRS audits more families receiving the earned income tax credit than it does millionaires. From what I read hundreds of EITC audits happen for each audit of a millionaire.
That's the real goal of the IRS expansion bill - to go after poor and middle class families, particularly in rural areas.
Of course the IRS will audit the middle class--that's where the money is. They claim no one making less than $400,000 will be audited, but they will audit returns reporting $390,000 income, find $40,000 in unreported income and then claim the person made $430,000 so he's a legitimate target.
Taxpayers making in excess of $400,000 have their returns prepared by lawyers and CPA's who make fewer mistakes than the average Joe preparing his own return, so of course the IRS isn't going to waste their time on an almost perfect tax return. Just like they've done for the last 60 years.