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Kathy Baskin
Level 2
August 22, 2026
Question

How to enter a solo 401K contribution for a single shareholder c corporation

  • August 22, 2026
  • 3 replies
  • 79 views

Individual is sole shareholder of a c corporation.  He has W-2 wages of $75,000

Lacerte doesn’t want to let me enter it on screen 24 solo 401k because it shows diagnostic #3421 (no self employment earnings.

Please help, I’ve tried everything I know

3 replies

TaxGuyBill
August 23, 2026

Are you preparing the 1040?  If so, it really isn’t going to show up there.

If it was an Employee contribution to a Traditional 401k, Box 1 of the W-2 should have already been reduced by the employee deferral and the W-2 will have a code in Box 12 indicating the contribution (which could possibly trigger other things, such as the Saver’s Credit).

If it was an Employer contribution, that should have been a deduction on the 1120.

    Kathy BaskinAuthor
    Level 2
    August 23, 2026

    Thank you!

      Kathy BaskinAuthor
      Level 2
      August 23, 2026

      Thank you for your help

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