There could be several reasons. Ask your employer why they put an amount in box 11.
From W-2 instructions:
"Box 11—Nonqualified plans.
The
purpose of box 11 is for the SSA to determine if any part of the amount
reported in box 1 or boxes 3 and/or 5 was earned
in a prior year. The SSA uses this information to
verify that they have properly applied the social security earnings test
and paid the correct amount of benefits.
Report distributions to an employee from a
nonqualified plan or nongovernmental section 457(b) plan in box 11. Also
report these distributions in box 1. Make only one
entry in this box. Distributions from governmental section 457(b) plans
must be reported on Form 1099-R, not in box 1 of
Form W-2."
**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.**
