W2 box 12 code Z

Hello,

 

My W2 for tax year 2023 has a code Z in box 12 indicating a section 409(A) violation. TurboTax (any edition) does not support the calculations needed to compute the penalty. Has anyone else experienced this, and have any pointers/references for how I should calculate the penalties? Any referrals to qualified tax professionals that would assist me with this (for a fee, of course)? All the local CPA's I contacted declined.

 

Thanks.