Box 11 non-qualified plans
Box 11 is used to define the parameters for Non-Qualified 457 plans.
An employee can have distributions or deferrals. Deferrals and federal distributions print in Box 11 of your W-2 CSV file. However, no information prints in Box 11 if an employee has both distributions and deferrals.
Distributions from section 457 plans of state and local agencies are reported on 1099-R forms, not W-2 forms. Do not use Box 11 to report these distributions.