I allegedly didn't report.
On November 12 2020, I got a CP2000 notice from the IRS claiming that I didn't report $10,000 in Beneficiary IRA RMD distributions for 2018 taxes, thus under-reporting my taxable income by $10,000. So I owe $2,900 in taxes due to that and some secondary effects that I won't bother to go into and including $190 in penalty interest.
I promptly sent in all the details I could showing that indeed I had reported it. But about every 3 months they sent me a notice, e.g. "Before we resolve this matter, we need to process all of your information. We'll send you our complete response within 90 days"
Finally I got a letter 8/26/21 - "we're pleased to tell you that the information you provided resolved the tax issue in question and that our inquiry is now closed".
9 months is a long time to have a $2,900 tax bill plus ever-growing penalty hanging over one's head.
If this gets any worse, it's not going to help us in the midterms. Yes, its the Republicans who keep defunding the IRS more and more, but that's not who the voters are going to blame for this and the many many other issues the Repukes have caused.
Details: https://www.democraticunderground.com/11212509