Question: w-2 what is box 12?
Answer: Each W2 Form box 12 code is either a single or double letter code. The W2 Box 12 codes are: ... C — Taxable costs of group-term life insurance over $50,000 (included in W-2 boxes 1,3 (up to Social Security wages base), and box 5. D — Elective deferral under a 401(k) cash or arrangement plan.