Box 12-D — Code D — Elective deferrals to a 401(k)
Traditional (pre-tax) elective deferrals to a section 401(k) cash or deferred arrangement.
What it means
Code D amounts are generally already excluded from Box 1. They count toward the annual elective deferral limit ($24,500 for 2026 under age 50, plus catch-up if eligible). They do not represent a second deduction on Form 1040.
Related glossary: 401k