Box 12 on your W-2 is used for reporting various types of compensation, benefits, and deductions that don't fit into the other standard wage and tax boxes.
You might see these codes listed on lines labeled 12a, 12b, 12c, or 12d. Those lowercase letters are just the physical line numbers on the printed form; the capital letter is the actual IRS code.
Here is the complete list of IRS Box 12 codes and what they represent:
A - Uncollected Social Security or RRTA tax on tips.
AA - Designated Roth contributions under a 401(k) plan.
B - Uncollected Medicare tax on tips.
BB - Designated Roth contributions under a 403(b) plan.
C - Taxable cost of group-term life insurance over $50,000 (already included in Box 1 wages).
D - Elective deferrals to a 401(k) cash or deferred arrangement (including a SIMPLE 401(k)).
DD - Cost of employer-sponsored health coverage (this is for information only and is not taxable).
E - Elective deferrals under a 403(b) salary reduction agreement.
EE - Designated Roth contributions under a governmental Section 457(b) plan.
F - Elective deferrals under a Section 408(k)(6) salary reduction SEP.
FF - Permitted benefits under a qualified small employer health reimbursement arrangement (QSEHRA).
G - Elective deferrals and employer contributions to a Section 457(b) deferred compensation plan.
GG - Income from qualified equity grants under Section 83(i).
H - Elective deferrals to a Section 501(c)(18)(D) tax-exempt organization plan.
HH - Aggregate deferrals under Section 83(i) elections.
II - Medicaid waiver payments excluded from gross income.
J - Nontaxable sick pay (information only).
K - 20% excise tax on excess golden parachute payments.
L - Substantiated employee business expense reimbursements (nontaxable).
M - Uncollected Social Security or RRTA tax on the taxable cost of group-term life insurance over $50,000 (for former employees only).
N - Uncollected Medicare tax on the taxable cost of group-term life insurance over $50,000 (for former employees only).
P - Excludable moving expense reimbursements paid directly to a member of the U.S. Armed Forces.
Q - Nontaxable combat pay.
R - Employer contributions to your Archer MSA.
S - Employee salary reduction contributions under a Section 408(p) SIMPLE retirement plan.
T - Employer-provided adoption benefits (not included in Box 1).
V - Income from the exercise of nonstatutory stock option(s) (already included in Box 1 wages).
W - Employer contributions (including your pre-tax cafeteria plan contributions) to your Health Savings Account (HSA).
Y - Deferrals under a Section 409A nonqualified deferred compensation plan.
Z - Income under a nonqualified deferred compensation plan that fails to satisfy Section 409A.
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