No, your solo 401-K contribution would be entered on Form 1040, schedule 1.This would be your schedule C net income less one half of your self-employment tax and your retirement plan contribution for yourself.
Internet research will indicate that there are alternative methods of treating this, but the authoratative IRS interpretation can be found in the IRS article.
You can learn more in this IRS article.
[Edited 6:36 AM 2/20/26 PST]
@hbb8344
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
