What Does Box 12 Code E Mean on a W-2?
403(b) contribution (typically nonprofits, schools) — what it means, whether it's taxable, and what to do with it.
By the Easy Guides Editorial Team · Updated for 2026
Code E in Box 12 of your W-2 means 403(b) contribution (typically nonprofits, schools). Tax treatment: Pre-tax (already excluded).
What Code E means
It works just like Code D but for a 403(b). Nothing extra to do at filing time; the tax benefit is already applied.
Does Code E affect my taxes?
Your pre-tax contribution to a 403(b) plan — common at schools, hospitals, and nonprofits. Like a 401(k), it's already excluded from your Box 1 wages.
Where to find Code E on your W-2
Box 12 has up to four slots — labeled 12a, 12b, 12c, and 12d. Each slot shows a letter code and a dollar amount. The 12a–12d labels are just line numbers; the actual code is the small letter next to the money. So "12a: E 5,000" means Code E with a $5,000 amount. When you file, enter the code and amount exactly as shown.