Box 12-C — Code C — Group-term life insurance
Taxable cost of group-term life insurance coverage over $50,000 (imputed income).
What it means
The amount in Code C is usually included in Boxes 1, 3, and 5. It is not cash you received; it is the IRS table cost of employer-provided coverage above $50,000. It can raise taxable wages slightly without increasing your paycheck.