Retirement tax questions

@anothermacuser - That is not correct.     Please cite the IRS regulations that permits that.

See IRS Pub 525 that specifies how to report it.

A 1099-MISC is never used for excessive deferrals.

[NOTE: currently there is a TurboTax but that errors on a W-2 with excess box 12 deferrals.  That should be fixed on 4/5/19 but has nothing to do with how to report the excess.]
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**