Sold company stock in 2021, got CP2000 in December, now CP3219A - total nightmare dealing with this

So it sounds like you're caught in a pretty common IRS timing issue. Here's what's likely happening: Your response to the CP2000 and the IRS sending the CP3219A probably crossed in the mail. The CP3219A is essentially the next step in the process if they don't receive a response to the CP2000. First, don't panic. If you already agreed to pay the additional tax from the CP2000, you should call the IRS at the number on your notice and explain that you've already responded to the previous notice. They'll be able to verify whether your response was received and processed. If you can't get through on the phone, send a written response to the address on the CP3219A explaining that you've already agreed to the assessment in response to the CP2000. Include copies of any documentation you sent previously. The good news is that since you agree with the assessment, you won't need to petition the tax court. But you do need to make sure the IRS knows you've agreed to pay so they don't escalate this further.

I went through almost the exact same situation last year with stock I sold. After weeks of stress and getting nowhere with the regular IRS number, I discovered taxr.ai (https://taxr.ai) which helped me figure out what was happening with my notices. It analyzes all your tax documents and gives you a clear explanation of what's happening and what steps to take. For me, it confirmed that my CP3219A was sent automatically before my CP2000 response was processed - exactly like what's happening to you. The site helped me draft a response letter that referenced my previous agreement, and explained exactly where to send it. Saved me from having to hire a tax professional for something that turned out to be pretty straightforward once I understood what was happening.

I was really skeptical about taxr.ai at first (mentioned above), but I was desperate with my own CP2000 situation involving stock sales where I had calculated my basis all wrong. Decided to give it a shot since I couldn't get any traction with the IRS phone lines. The service was actually legit - uploaded my notices and supporting documents, and within a day got a detailed explanation of exactly where my basis calculations were wrong and how to fix them. They even provided a template response letter that referenced the specific tax code sections relevant to my situation. Just sent everything in last month and got confirmation from the IRS that my case was resolved. Saved me from having to hire a CPA for what turned out to be fixable once I understood what was happening.

If you're still struggling to get through to the IRS, I finally got through using Claimyr (https://claimyr.com). After trying for weeks to call the IRS about my own CP3219A notice from stock sales that weren't reported correctly, I was ready to give up. Their service basically holds your place in the IRS phone queue and calls you when an agent picks up. You can see how it works in their demo video: https://youtu.be/_kiP6q8DX5c. I was super skeptical at first but I was out of options. Got connected to an IRS agent in about 45 minutes instead of the hours I was spending on hold getting nowhere. The agent confirmed my CP2000 response was in their system but hadn't been fully processed when the CP3219A automatically went out. They put a hold on further collection activity while they finished processing my original response.

I need to eat some humble pie here. After posting my skeptical comment about Claimyr above, I decided to try it anyway out of pure desperation with my own CP2000 situation. I figured it couldn't be worse than the 6 failed attempts I'd already made. It actually worked exactly as described. I got a call back in about 35 minutes with an IRS agent already on the line. The agent confirmed that my CP2000 response (for unreported stock sales) had been received but was still being processed. They put notes in my account to prevent further escalation while my response is being reviewed. The agent said this happens all the time with their automated notice system and my situation wasn't unusual. Saved myself countless hours of frustration, and probably saved me from getting a CP3219A like the original poster. Worth every penny for the time saved alone.

One thing nobody mentioned yet - you need to make sure you actually pay the amount you agreed to on the CP2000. Even if you responded agreeing to the assessment, if you didn't send the payment, they'll continue with collections. The CP3219A is basically saying "last chance before we really escalate this." Call the IRS (use one of the methods suggested above since getting through is a nightmare) and make sure: 1) your response was received, and 2) verify if your payment was received. If not, pay it ASAP. For future reference - stock sales are one of the biggest triggers for CP2000 notices because the basis reporting is so complicated. Always double check your 1099-B against the actual transactions.

Make sure you're calculating the correct cost basis for your stock sales. This is the #1 reason people get these notices for stock transactions. The IRS gets the sale price reported from brokerages but often doesn't get the correct purchase price, especially for employee stock options or RSUs. For the future, keep detailed records of all stock purchases, grants, and vesting schedules. The default basis reporting is frequently wrong for company stock plans and can trigger these kinds of notices.