@abctax55 "IF the IRS "assumes" cash flow equals reportable income and taxpayers are required to prove them wrong.... oy.

That's exactly what they do in many business audits.  

@sjrcpa "The tax cheats will go bankless, as many already do."

Those that are dealing only with cash are a small part of the problem. It's those who are selling goods or services to people who want to use plastic or checks that this is intended to discourage.