Let’s start at the beginning. What is a CP2000 Notice, and when is it generated? Here’s what happens. The IRS Automated Underreporter Unit (AUR) matches income reported on individual tax returns with the income that is reported to the IRS from various third parties (e.g., employers, financial institutions, and banks) and recorded in its wage and income transcript file. If there is a difference, the IRS “flags” the tax ... Bill Nemeth, EA