Is there a letter after the monetary amount? 12a is just a catchall box as is 12b,12c and 12d, most of them are non taxable
A - Uncollected social security or RRTA tax on tips.
B - Uncollected Medicare tax on tips.
C - Taxable cost of group-term life insurance over $50,000
D - Elective deferrals under a section 401(k)
E - Elective deferrals under a section 403(b)
F - Elective deferrals under a section 408(k)(6) SEP retirement plan
G - Elective deferrals and employer contributions
H - Elective deferrals to a section 501(c)(18)(D) tax-exempt organization retirement plan
J - Nontaxable sick pay
K - 20% excise tax on excess golden parachute payments
L - Employee business expense reimbursements (nontaxable and not included in Box 1). You can't deduct any of the expenses related to this reimbursement.
M - Uncollected social security or RRTA tax on taxable cost of group term life insurance over $50,000 (former employees only)
N - Uncollected Medicare tax on taxable cost of group term life insurance over $50,000 (former employees only)
P - Excludable moving expense reimbursements paid directly to a member of the U.S. Armed Forces (not included in boxes 1, 3, or 5)
Q - Nontaxable combat pay
R - Employer contributions to your Archer MSA
S - Employee salary reduction contributions under a section 408(p)
T - Adoption benefits (not included in box 1)
V - Income from exercise of non-statutory stock option
W - Contributions made through your employer to your Health Savings Account
Y - Deferrals under a section 409A non-qualified deferred compensation retirement plan.
Z - Income under section 409A on a non-qualified deferred compensation retirement plan
AA - Designated Roth contributions to a section 401(k) retirement plan
BB - Designated Roth contributions under a section 403(b) salary reduction agreement retirement plan
DD - Cost of employer-sponsored health coverage (nontaxable)
EE - Designated Roth contributions under a governmental section 457(b) plan
FF - Permitted benefits under a qualified small employer health reimbursement arrangement
GG - Income from qualified equity grants under section 83(i)
HH - Aggregate deferrals under section 83(i) elections as of the close of the calendar year
II - Medicaid waiver payments
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