Deferred Compensation on W-2: Box 11, Box 12, and Code Z

Deferred compensation on a W-2 appears in two different places depending on the type of plan. Contributions to a qualified retirement plan such as a 401(k), 403(b), governmental 457(b), or SIMPLE IRA show up in Box 12 next to a letter code that identifies the plan. Non-qualified deferred compensation uses Box 11, and in certain situations it also lands in Box 1 and Box 12 with Code Z. The box your deferral sits in determines whether it reduced your taxable wages, whether FICA has already been collected on it, and whether the IRS is treating it as a routine contribution or a penalty event.

Box 12: Qualified Plan Deferrals

Box 12 is informational. The IRS uses it to confirm that you stayed within the annual contribution limit for your plan type, and the amount shown explains why Box 1 (taxable wages) is lower than your gross pay when you made pre-tax contributions.¹

The letter code tells you which kind of plan the deferral went into:

Code D — elective deferrals to a 401(k) plan.
Code E — elective deferrals to a 403(b) plan, common at public schools and certain nonprofits.
Code G — deferrals and employer contributions to a governmental or nongovernmental 457(b) plan.
Code S — employee salary reduction contributions to a SIMPLE IRA.
Code AA — designated Roth contributions to a 401(k).
Code BB — designated Roth contributions to a 403(b).
Code EE — designated Roth contributions to a governmental 457(b).
Code W — employer and employee contributions to a Health Savings Account made through the employer.

Pre-tax codes (D, E, G, S) reduce the figure in Box 1 but not the figures in Box 3 (Social Security wages) or Box 5 (Medicare wages), because FICA still applies to the deferred amount. Roth codes (AA, BB, EE) use after-tax dollars, so the contribution is already included in Boxes 1, 3, and 5.¹

Employer matching and profit-sharing contributions to a 401(k) or 403(b) do not appear in Box 12. The plan administrator tracks those separately. Box 12 shows only amounts you elected to defer out of your own paycheck.

2026 Limits to Check Your Box 12 Figure Against

For 2026, the standard elective deferral limit for 401(k), 403(b), and governmental 457(b) plans is $24,500.² Participants age 50 or older can add an $8,000 catch-up, for $32,500 total. Under the SECURE 2.0 Act’s enhanced catch-up, participants aged 60 through 63 can add $11,250 instead, for $35,750. SIMPLE IRA salary reduction contributions are capped at $17,000, with certain employers permitted an enhanced $18,100 limit. HSA contributions reported under Code W are capped at $4,400 for self-only coverage and $8,750 for family coverage.³

Starting January 1, 2026, catch-up contributions follow a new rule for higher earners. If your FICA wages from the same employer (Box 3 of your prior-year W-2) exceeded $150,000, your catch-up contributions must be made as designated Roth contributions. The catch-up portion will appear under Code AA, BB, or EE rather than D, E, or G, and it will be included in your Box 1 taxable wages. Employees at or below $150,000 can continue making pre-tax catch-up contributions. The threshold is indexed and tested each year against the preceding year’s wages, so verify your 2025 Box 3 figure before relying on pre-tax catch-up treatment for 2026.

Box 11: Non-Qualified Deferred Compensation

Non-qualified deferred compensation (NQDC) uses Box 11, labeled “Nonqualified plans.” Its purpose is narrower than most people assume. Box 11 tells the Social Security Administration whether any portion of the wages shown in Box 1, Box 3, or Box 5 was actually earned in a prior year, so the SSA can allocate earnings to the correct years when calculating future Social Security benefits.⁴

When an NQDC plan complies with Section 409A, the deferred amount stays out of Box 1 during the deferral years. No income tax impact appears on the W-2 until the money is distributed. At distribution, the payout is reported as wages in Box 1, and Box 11 flags the portion that is attributable to work performed in earlier years.

Why Box 3 and Box 5 Can Include NQDC Before Box 1 Does

Deferred compensation is subject to Social Security and Medicare taxes long before it is subject to income tax. Under the FICA special timing rule, NQDC becomes subject to FICA at the later of when you performed the services or when the substantial risk of forfeiture lapses.⁵

In practice, your W-2 can include the NQDC amount in Box 3 and Box 5 while excluding it from Box 1. The 2026 Social Security wage base is $184,500, so an NQDC amount only increases Box 3 if your total wages have not already hit that cap.⁶ Medicare has no wage cap, so Box 5 always reflects the deferred amount. Your employer tracks the early FICA taxation so that the same dollars are not taxed again when distribution eventually occurs.

A substantial risk of forfeiture that lapses can also force the deferred amount into Box 1 even without a 409A violation. If your right to the compensation was contingent on continued employment or hitting performance goals, the amount is included in Box 1 once the condition is satisfied, whether or not cash has changed hands.

Code Z: When a 409A Plan Fails

Section 409A sets ground rules for non-qualified deferred compensation. Deferral elections must be made before the start of the year in which the compensation will be earned (six months before the end of the service period for performance-based pay tied to a period of at least 12 months). Distributions can only happen on separation from service, disability, death, a date or schedule fixed in the plan, a change in corporate ownership, or an unforeseeable emergency. Neither the employee nor the employer can accelerate the timing of a distribution beyond what the plan originally specified.⁷

When a plan violates any of these rules, the entire deferred balance, not just the current year’s deferral, becomes immediately taxable. The forced inclusion shows up in Box 1 as additional wages and simultaneously in Box 12 under Code Z, which flags income from a non-compliant 409A plan.⁸ On top of regular income tax, the employee owes a flat 20% penalty on the non-compliant amount plus interest calculated back to the year the compensation was originally deferred.⁷ A Code Z entry on a W-2 almost always means a bill that exceeds the cash in hand, because the tax is due on money that has not been paid out.

What the W-2 Shows at Distribution

NQDC paid to an employee is reported on the W-2, not on Form 1099-R.⁹ The distribution appears as wages in Box 1 in the year received. Because the income was never previously taxed (assuming 409A compliance), the full amount is subject to income tax at your marginal rate. Box 11 tells the SSA and IRS which portion of those Box 1 wages was already subject to FICA in a prior year, preventing double FICA.

NQDC distributions are not subject to the 10% early withdrawal penalty that applies to qualified plans, regardless of your age at distribution. They are treated as supplemental wages for withholding. For 2026, federal supplemental wage withholding is a flat 22%, or 37% on amounts over $1 million paid to the same employee during the calendar year.¹⁰ A large lump sum can push you into a higher bracket than the 22% default covers, so estimated tax payments may be needed to close the gap.

What Does Not Appear on the W-2

Distributions from qualified plans such as 401(k) and 403(b) accounts come on Form 1099-R, not on the W-2, because by then you are typically no longer an active employee of that payer. Distributions from a governmental 457(b) also use Form 1099-R.⁹

Non-qualified deferred compensation paid to an independent contractor uses Form 1099-MISC. Compliant deferrals of $600 or more for nonemployees go in Box 12 of the 1099-MISC; non-compliant 409A amounts go in Box 15.¹¹ If you receive deferred compensation as a contractor, you will not see any W-2 reporting for it at all.

Fixing a Wrong Box

Errors involving deferred compensation are common, especially where NQDC FICA timing differs from income tax timing. If your Box 12 code is wrong, Box 11 is missing, or Boxes 3 and 5 do not reflect the special timing rule, your employer must file a corrected Form W-2c with the Social Security Administration and give you a copy.¹² Compare the box amounts against your pay stubs and plan statements before filing your return; once a corrected W-2c arrives, use the corrected figures.

1
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
2
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026
3
Internal Revenue Service. Expanded Availability of Health Savings Accounts
4
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3 – Section: Box 11
5
eCFR. 26 CFR 31.3121(v)(2)-1 Treatment of Amounts Deferred Under Certain Nonqualified Deferred Compensation Plans
6
Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet
7
Office of the Law Revision Counsel. 26 USC 409A Inclusion in Gross Income of Deferred Compensation Under Nonqualified Deferred Compensation Plans
8
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3 – Section: Box 12 Code Z
9
Internal Revenue Service. Instructions for Forms 1099-R and 5498
10
Internal Revenue Service. 2026 Publication 15 – Section: Supplemental Wages
11
Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC
12
Internal Revenue Service. About Form W-2c, Corrected Wage and Tax Statements