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Part III

SECTION 4. DEFINITION OF W-2

Internal Revenue Bulletin 2019-31 · 2026-10-03 edition · updated 2026-10-04 · United States

WAGES AND CORRELATION WITH BOXES ON FORM W-2

.01 Definition of W-2 wages. Section 199A(g)(1)(B)(ii) provides that W-2 wages are determined in the same manner as under section 199A(b)(4) (without regard to section 199A(b)(4)(B)). Section 199A(b)(4)(A) provides that W-2 wages means, with respect to any person for any taxable year of such person, the sum of the amounts described in section 6051(a)(3) and (8) paid by such person with respect to employment of employees by such person during the calendar year ending during such taxable year. Thus, as also provided in §1.199A-11(b)(1), W-2 wages include: (i) the total amount of wages (as defined in section 3401(a)); (ii) the total amount of elective deferrals (within the meaning of section 402(g) (3)); (iii) the compensation deferred under section 457; and (iv) the amount of designated Roth contributions (as defined in section 402A).

.02 Correlation with Form W-2. On the 2018 Forms W-2, the elective deferrals under section 402(g)(3) and the amounts deferred under section 457 directly correlate to coded items reported in Box 12 on Form W-2. Box 12, Code D is for elective deferrals to a section 401(k) cash or deferred arrangement plan (including a SIMPLE 401(k) arrangement); Box 12, Code E is for elective deferrals under a section 403(b) salary reduction agreement; Box 12, Code F is for elective deferrals under a section 408(k)(6) salary reduction Simplified Employee Pension (SEP); Box 12, Code G is for elective deferrals and employer contributions (including nonelective deferrals) to any governmental or nongovernmental section 457(b) deferred compensation plan; Box 12, Code S is for employee salary reduction contributions under a section 408(p) SIMPLE (simple retirement account); Box 12, Code AA is for designated Roth contributions (as defined in section 402A) under a section 401(k) plan; and Box 12, Code BB is for designated Roth contributions (as defined in section 402A) under a section 403(b) salary reduction agreement. However, designated Roth contributions are also reported in Box 1, wages, tips,

other compensation and are subject to income tax withholding.

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