The letter must include a reference to the penalty notice in question, the nature of the penalty, your reason for the abatement (along with supporting documents), and your contact information.

“Because this request usually must be made in writing, a formal letter is filed with the IRS — usually via Form 843 — requesting abatement and explaining the reason(s) that led to the ...

On the 5500 website, you have to log in and file a Form. 5500 will tell you as much when you try to file. Just had a plan sponsor send me a screenshot of that, together with a $40,000 penalty from ...

How to File Form 843: Claim for Refund and Request for Abatement . Form 843 requires basic information such as name, address, Social Security number, tax period, tax type, and return type.