CP2100 Letters: What to Do When They Arrive

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Thursday, September 24, 2026 | 2:00PM-3:45PM Eastern Time

September means one thing for accounts payable and tax teams: CP2100 letters are hitting mailboxes. If you've received one before, you know the clock starts ticking the moment it arrives. If this is your first time, you're about to learn fast.

This webinar walks you through exactly what to do when a CP2100 letter shows up, from the moment you open the envelope to the final steps of compliance. We've rebuilt this session from the ground up with the latest guidance from the IRS, including a critical new wrinkle: the IRS now allows verification of EINs via online lookup, but can that verification be used to satisfy second B Notice requirements? We'll walk through the guidance and share why we don't think it can, and what that means for your process.

Whether you're a CP2100 veteran looking for an update or you're bracing for your first one, this session gives you the roadmap to respond correctly, on time, and with confidence.

Agenda:

  • What is a CP2100 letter, in general?
  • Why do we file 1099s? And how does the IRS use 1099s?
  • CP2100 letters — initial actions
  • B Notices
  • Backup withholding

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Featured Speaker

Jason Dinesen

Jason Dinesen, EA, is a distinguished tax professional and educator with a fervent passion for demystifying complex tax concepts. Jason is the founder of Dinesen Tax & Accounting, P.C. and Dinesen Tax Advisory, LLC in the tax and accounting world. He also is founder of Dinesen Media Ventures, which provides a diverse range of media content, ranging from continuing education programs for accountants and tax professionals, to podcast production to radio and journalism content. 

Recognized for his sharp tax interpretations, Jason is renowned for promptly analyzing the latest tax updates and IRS guidance, sharing his insights with the professional community. Over his career, he has educated more than 200,000 accounting, tax, and HR professionals on various topics. Form 1099 was the very first thing he ever taught on, on April 26th, 2012, at a Sheraton Hotel next to a Lowe's in West Des Moines, Iowa. He still teaches on 1099s and around 30 other tax topics.


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IOFM is committed to accessibility. Disability-related accommodation requests for the live event (such as providing live captioning) should be sent to [email protected] by close of business the day before the live webinar. A captioned recording of this webinar can be made available upon request to [email protected].


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