What are the codes in Box 12 of W2?
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There are 29 codes that can be reported in Box 12 of Form W2. And, these codes are to indicate the compensation and benefits offered to an employee. 

Here is the list of codes.

A - Uncollected social security or RRTA tax on tips.
B - Uncollected Medicare tax on tips.
C - Taxable cost of group-term insurance over $50,000 (included in box 1, 3 and, 5)
D - Elective deferrals to a section 401(k) cash (includes deferrals under a SIMPLE retirement account that is part of the 401(k) arrangement)
E - Elective deferrals to your 403(b) plan.
F - Elective deferrals under a section 408(k)(6) plan.
G - Elective deferrals and employer contributions to a section 457(b) deferred compensation plan.      
H - Elective deferrals to a section 501(c)(18)(D) tax-exempt organization plan. 
J -  Nontaxable sick pay
K - 20% excise tax on excess golden parachute payments
L - Substantiated employee business expense reimbursements (Nontaxable)   
M - Uncollected social security or RRTA tax on taxable cost of group-term life insurance over $50,000 (applicable only to former employees).       
N - Uncollected Medicare tax on taxable cost of group-term life insurance over $50,000 (applicable only to former employees).
P - Excludable moving expense reimbursements paid directly to a member of the U.S. Armed Forces (this is not included in box 1, 3, or 5)    
Q - Nontaxable combat pay. 
R - Employer contributions for Archer MSA.
S - Employee contributions under a section 408(p) SIMPLE plan