This article reflects federal rules and general state rules as of June 2026 and covers tax year 2025 (returns filed in 2026). Tax law changes — confirm current figures before you file.
Quick Answer
Deferred comp shows up in different W-2 boxes by type. For tax year 2025, qualified deferrals (401(k), 403(b), 457(b)) appear in Box 12 with a letter code. Nonqualified deferred comp distributions appear in Box 1 and Box 11, while deferrals can hit Box 3 and Box 5 in an earlier year.
Your W-2 does not have one tidy line that says “deferred compensation,” and that gap causes most of the confusion. The same dollars can land in one box for income tax and a different box, in a different year, for Social Security and Medicare — and a single failed plan can trigger a 20% penalty in Box 12 Code Z.
This matters because the numbers feed straight onto your Form 1040, and the IRS matches your return to your W-2 line by line. About 60% of private-sector workers had access to a retirement plan in 2025, per the Bureau of Labor Statistics, so millions of W-2s carry one of these codes every season.
- 💰 How each deferred comp type maps to a specific W-2 box and code for 2025
- 🧾 Why Box 11 and Box 1 can show the same money while Box 3 and 5 do not
- ⏳ The FICA “special timing rule” that taxes deferrals years before you get paid
- ⚠️ How a 409A failure lands in Box 12 Code Z and adds a 20% penalty tax
- ✅ The exact steps to report each box correctly and avoid an IRS notice
What “Deferred Comp” Actually Means on a W-2
Deferred compensation is pay you earn now but receive later. The tax rules — and the W-2 boxes — split sharply by whether the plan is qualified or nonqualified, so the first job is figuring out which one you have.
A qualified plan follows IRS contribution limits and gets special tax protection. These are your everyday workplace plans: the 401(k), the 403(b) for schools and nonprofits, and the governmental 457(b). Money you defer into these is set aside in a trust the employer’s creditors cannot touch.
A nonqualified deferred compensation (NQDC) plan is a private agreement between you and your employer to pay you later, usually for highly paid staff. There is no protective trust, the money sits among the company’s general assets, and the rules in Section 409A control exactly when you can be paid. Enron’s collapse, where executives raced to pull deferred money before bankruptcy, is the reason 409A exists.
The consequence of mixing these up is real. If you treat a Box 11 nonqualified distribution like a 401(k) rollover, you can underreport income and draw an IRS CP2000 notice with tax, penalty, and interest. The misconception to drop: “deferred comp is all one thing.” It is not — and your W-2 proves it by using separate boxes. Your next step is to read the box that matches your plan type below.
Which Situation Applies to You?
The right section depends on your plan and your role. Use this to jump to your case.
- You contribute to a 401(k), 403(b), or governmental 457(b) → read “Qualified Plans: Box 12 Codes.”
- You defer salary or a bonus into a top-hat or executive plan → read “Nonqualified Deferred Comp: Box 11 and Box 1.”
- You retired and are now receiving prior deferrals → read “Box 11 on Distribution” and the FICA timing section.
- You were told your plan failed 409A → read “Box 12 Code Z and the 20% Penalty.”
- You are an HR or payroll preparer → read every section, plus “Mistakes to Avoid.”
Each path points to a worked example with real dollar figures so you can copy the math for your own return.
Qualified Plans: Box 12 Codes for 2025
For qualified plans, your elective deferrals are not in Box 1 — they were already subtracted before your taxable wages were calculated. Instead, they appear in Box 12 with a letter code that tells the IRS which plan received the money. This is why your Box 1 is often lower than your Box 3 and Box 5.
Here is what each common code means for tax year 2025, drawn from the IRS Box 12 code list.
Code D — 401(k) Elective Deferrals
Code D reports the salary you chose to put into a traditional 401(k). For 2025, the elective deferral limit is $23,500, with a catch-up of $7,500 if you are 50 or older. These dollars skip Box 1 but stay in Boxes 3 and 5, so you still pay Social Security and Medicare on them. The consequence of exceeding the limit is double taxation: the excess is taxed in the contribution year and again at distribution. If you switched jobs and over-contributed across two employers, request a corrective distribution before April 15, 2026.
Code E and Code BB — 403(b) Plans
Code E reports traditional 403(b) deferrals; Code BB reports Roth 403(b) deferrals. The same $23,500 limit applies for 2025. Roth amounts (Code BB) are included in Box 1 because you pay tax now for tax-free growth later. A common misconception is that the 403(b) limit is separate from a 401(k) limit at the same job — it is not; they share one employee limit. If you contribute to both, track the combined total to avoid an excess.
Code G — Governmental 457(b)
Code G reports both your deferrals and any employer contributions to a governmental 457(b) plan, with a 2025 limit of $23,500. A key feature: a 457(b) has no early-withdrawal 10% penalty once you separate from service, unlike a 401(k). The consequence of ignoring this is paying a penalty you never owed. If you are a government employee leaving your job, confirm your distribution is coded correctly before you file.
Code AA and EE — Roth Versions
Code AA reports designated Roth contributions to a 401(k); Code EE reports designated Roth contributions to a governmental 457(b). Because these are after-tax, they are already in Box 1. The benefit is qualified tax-free withdrawals in retirement. Many filers wrongly try to deduct these — you cannot, because you already paid tax. Keep your records to prove the contributions were Roth when you eventually withdraw.
Nonqualified Deferred Comp: Box 11 and Box 1
Nonqualified deferred comp is where the W-2 gets tricky, because the same dollars are taxed for income tax and for FICA (Social Security and Medicare) in different years. Box 11 is the box the Social Security Administration uses to line those years up.
According to the IRS Form W-2 instructions, Box 11 is used in two situations. First, it shows a distribution paid to you this year from an NQDC or nongovernmental 457(b) plan — and that amount is also included in Box 1 as taxable wages. Second, it shows a prior-year deferral that became taxable for Social Security and Medicare this year because it finally vested — and that amount is included in Box 3 and/or Box 5.
The purpose is to prevent the SSA from miscounting your earnings under the retirement earnings test. Box 11 tells the SSA, “this Box 1 money was actually earned in an earlier year,” so your benefits are calculated correctly. The consequence of a missing Box 11 is a benefits miscalculation that can cost a retiree real monthly income.
A frequent misconception: people see Box 11 and think it is extra income to add on top of Box 1. It is not — it is a subset already inside Box 1. Adding it again overstates your income and your tax. If your W-2 has Box 11 filled in, report the W-2 exactly as printed and let your software carry the amounts; do not manually add Box 11 to your wages.
The FICA Special Timing Rule (Why the Years Differ)
This rule is the single most misunderstood part of deferred comp reporting, and understanding it explains your whole W-2. Under the FICA special timing rule, amounts deferred under an NQDC plan are subject to Social Security and Medicare tax at the later of when you perform the services or when the money vests — not when it is paid.
That is years earlier than income tax, which applies only when the money is actually distributed. The practical effect usually helps high earners. If you already cross the 2025 Social Security wage base of $176,100 from your regular salary, the deferred amount escapes the 6.2% Social Security tax entirely, because you are already over the cap. Medicare’s 1.45% (plus the 0.9% additional Medicare tax on high earners) still applies, since Medicare has no wage cap.
The consequence of ignoring this rule is harsh. If FICA is not withheld at vesting, the entire balance plus all its growth gets hit with FICA at distribution — often a year when you have little other wage income to absorb the Social Security cap, so you pay 6.2% on dollars that could have been exempt. The misconception is that “FICA and income tax always happen together.” For nonqualified plans, they usually do not. Your action step: ask your employer’s benefits team which year your deferrals were taken into account for FICA, and keep that confirmation.
Worked Example: A High Earner Defers a Bonus
Numbers make this concrete. Meet Maria, a 2025 executive with a $250,000 salary who defers a $40,000 bonus into her company’s nonqualified plan, fully vested when earned.
Because Maria’s $250,000 salary already exceeds the 2025 Social Security wage base of $176,100, the special timing rule means her $40,000 deferral owes no Social Security tax — she is already over the cap. She does owe Medicare: $40,000 × 1.45% = $580, plus the 0.9% additional Medicare tax on amounts over $200,000, which her salary already triggers. So her 2025 W-2 reflects FICA on the deferral now, but the $40,000 is not in Box 1 this year.
Fast-forward to 2032, when Maria retires and receives the $40,000 plus $10,000 of growth, totaling $50,000. That year her W-2 shows $50,000 in Box 1 (income tax now applies) and $50,000 in Box 11 (telling the SSA it was earned earlier). She pays no FICA again on it, because she already did in 2025. Had her employer skipped the special timing rule, she would owe Social Security tax on $50,000 in 2032 — a costly mistake on her retirement income.
Box 12 Code Z and the 20% Penalty
If a nonqualified plan fails Section 409A, the W-2 reporting changes dramatically and the cost spikes. The deferred amount becomes taxable immediately, gets reported in Box 1, and the failed amount is also flagged in Box 12 using Code Z, per the IRS retirement-plan code guidance.
Code Z is a warning label. It tells the IRS that this income failed 409A and is subject to an additional 20% federal tax on top of your normal income tax, plus a premium-interest charge. A failure can come from something as simple as letting an executive change a payout date improperly or paying early. The consequence is severe: an employee who failed 409A on $100,000 owes ordinary income tax plus a $20,000 penalty plus interest — for income they may not even control yet.
The misconception is that Code Z is just informational like other Box 12 codes. It is not; it carries a real penalty most tax software will not calculate for you. If your W-2 shows Code Z, do not ignore it — gather your plan documents and consult a tax professional before filing, because the IRS audits these payments closely.
Three Common Scenarios
These are the three situations that send filers searching for answers. Each shows how the box plays out.
Scenario 1: Active 401(k) Contributor
| What Happens on Your W-2 | What It Means for You |
|---|---|
| Box 1 is lower than Box 3 and Box 5 | Your deferrals were excluded from income tax but not FICA |
| Box 12 shows Code D with your deferral total | Confirm it does not exceed $23,500 for 2025 |
| No Box 11 entry | Nothing to reconcile with the SSA |
Scenario 2: Executive Deferring Salary
| What Happens on Your W-2 | What It Means for You |
|---|---|
| Deferral missing from Box 1 in the deferral year | Income tax is postponed until distribution |
| Boxes 3 and 5 may include the deferral at vesting | FICA applied early under the special timing rule |
| Box 11 used only when distribution or vesting hits | The SSA aligns the right earnings year |
Scenario 3: Retiree Receiving a Distribution
| What Happens on Your W-2 | What It Means for You |
|---|---|
| Box 1 shows the full distribution amount | Income tax is due this year |
| Box 11 matches the Box 1 distribution | Already counted in Box 1 — do not add it again |
| Boxes 3 and 5 are blank for that money | FICA was already paid in the earlier vesting year |
Named Examples
David, a teacher, defers $10,000 into his 403(b) in 2025. His W-2 shows Code E for $10,000, his Box 1 is reduced by that amount, and Boxes 3 and 5 still include it. David files normally; his software handles the exclusion automatically, and he owes no extra step.
Priya, a city engineer, contributes $15,000 to her governmental 457(b). Her W-2 shows Code G. When she leaves city employment at 48 and takes a distribution, she owes income tax but no 10% early-withdrawal penalty, a 457(b) advantage she confirms before filing so she does not overpay.
Robert, a retired executive, receives a $120,000 nonqualified payout in 2025. His W-2 lists $120,000 in Box 1 and $120,000 in Box 11, with Boxes 3 and 5 blank because FICA was paid years earlier at vesting. Robert reports the W-2 as printed and resists the urge to add Box 11 on top of Box 1.
How to Report Each Box on Your 1040
The reporting is straightforward once you know which box you have. Enter your W-2 exactly as printed into your software or onto your return, and the amounts flow to the right lines.
Box 1 wages, including any nonqualified distribution, go to Form 1040, line 1a. A nonqualified pension or 457 amount shown in Box 11 is also reflected on Schedule 1, line 8t, but your software pulls this from the W-2 — you do not enter it twice, as the IRS Schedule 1 instructions describe. Box 12 codes are entered into the Box 12 section of your software, which applies each code’s effect. For a Code Z amount, you must add the 20% additional tax on Schedule 2, since most software will not compute it for you.
If you turned 62 by year-end and had both a deferral and a distribution in the same year, your employer should file Form SSA-131 with the SSA and give you a copy, per the Form W-2 instructions. Keep it with your records to protect your benefit calculation.
Federal vs. State Reporting
Start with federal, then check your state, because states do not all follow federal timing. The W-2 boxes are federal, but Box 16 (state wages) can differ from Box 1.
Most states with an income tax follow the federal treatment of 401(k) and 403(b) deferrals, excluding them from state wages too. Nonqualified deferred comp is murkier: some states tax deferrals when earned, while federal law taxes them at distribution. Federal law (the “source tax” rule, 4 U.S.C. 114) does bar a state from taxing your nonqualified retirement distributions after you move away, if paid over your life or at least 10 years.
| Federal Treatment | State Variation to Check |
|---|---|
| Box 1 excludes 401(k)/403(b) deferrals | Box 16 usually matches, but confirm |
| NQDC taxed at distribution | Some states tax at vesting instead |
| No state income tax in 9 states | Texas, Florida, and others tax none of it |
The nine no-income-tax states — including Texas, Florida, Tennessee, and Washington — do not tax any of this at the state level, which is a complete and valuable answer if you live there. Your action: compare Box 1 to Box 16, and if they differ on deferred comp, ask your payroll department why before you file your state return.
Mistakes to Avoid
Each of these errors carries a specific cost.
- Adding Box 11 to Box 1. This double-counts income and inflates your tax bill by hundreds or thousands of dollars.
- Trying to deduct Roth codes (AA, BB, EE). These are after-tax; claiming a deduction triggers an IRS adjustment and possible penalty.
- Ignoring Box 12 Code Z. Skipping the 20% additional tax leads to a large IRS bill plus interest later.
- Exceeding the $23,500 elective limit across two jobs. The excess is taxed twice unless you fix it by April 15, 2026.
- Assuming a 457(b) has a 10% early penalty. It does not after separation; overpaying gives the IRS money you do not owe.
- Treating an NQDC distribution as a tax-free rollover. It is fully taxable wages and cannot be rolled into an IRA.
- Forgetting state differences. Filing Box 1 as your state wage when Box 16 differs causes a state notice.
- Missing Form SSA-131 when over 62. Without it, the SSA may reduce your benefits incorrectly.
Do’s and Don’ts
- Do report your W-2 exactly as printed, because the IRS matches it to your return automatically.
- Do verify your Box 12 deferral stays within the 2025 limit, to avoid double taxation.
- Do keep plan documents for nonqualified comp, because 409A questions can surface years later.
- Do compare Box 1 to Box 16, since a mismatch flags a state filing issue.
- Do consult a professional for Code Z, because the 20% penalty is easy to miscalculate.
- Don’t add Box 11 to your wages, because it is already inside Box 1.
- Don’t assume FICA and income tax hit the same year, because nonqualified plans split them.
- Don’t roll an NQDC distribution into an IRA, because it is not eligible and the attempt is taxable.
- Don’t guess at state conformity, because rules vary and guessing misleads your return.
- Don’t discard Form SSA-131, because it protects your Social Security benefit amount.
Pros and Cons of Deferred Comp
- Pro: Tax deferral lets investments grow before income tax applies, boosting long-term value.
- Pro: The FICA special timing rule can exempt deferrals from Social Security tax for high earners over the wage base.
- Pro: A 457(b) avoids the 10% early-withdrawal penalty after you separate from service.
- Pro: Roth options (Codes AA, BB, EE) deliver tax-free qualified withdrawals later.
- Pro: Deferring income to a lower-bracket retirement year can cut your lifetime tax bill.
- Con: Nonqualified balances are unsecured and exposed to your employer’s bankruptcy.
- Con: A 409A failure adds a 20% penalty plus interest on top of regular tax.
- Con: You cannot roll nonqualified distributions into an IRA, limiting flexibility.
- Con: Distribution timing is locked in advance under 409A, so you lose access flexibility.
- Con: Complex W-2 reporting raises the odds of a filing error and an IRS notice.
What to Do Next
Take these steps in order before you file your 2025 return.
- Identify your plan type and find the matching box: Box 12 code for qualified plans, Box 11 and Box 1 for nonqualified.
- Enter every W-2 box exactly as printed into your tax software — never adjust or combine boxes yourself.
- If you see Code Z, gather plan documents and compute the 20% additional tax on Schedule 2.
- Compare Box 1 to Box 16 and resolve any deferred-comp mismatch with payroll before filing your state return.
- If you are over 62 with same-year deferral and distribution, get your Form SSA-131 copy from your employer.
- For any nonqualified plan, 409A question, or large distribution, call a CPA or tax attorney — these YMYL situations carry real penalties, and professional review typically costs a few hundred dollars against thousands in risk.
This article is educational and not a substitute for advice from a licensed tax professional for your specific situation.
FAQs
Is deferred comp included in Box 1 of my W-2?
It depends on the type. Qualified 401(k) and traditional 403(b) deferrals are excluded from Box 1 for 2025. Roth deferrals and nonqualified distributions are included in Box 1.
What is Box 11 on my W-2?
Box 11 reports nonqualified plan amounts. It shows distributions from a nonqualified or nongovernmental 457(b) plan, or prior-year deferrals now taxable for Social Security, so the SSA aligns the correct earnings year.
Do I add Box 11 to my wages?
No. Box 11 is already part of Box 1. Adding it again overstates your income and tax. Report your W-2 exactly as printed and let your software handle it.
What does Code D in Box 12 mean?
Code D is your 401(k) elective deferral. For 2025 the limit is $23,500, plus a $7,500 catch-up at age 50 or older. It is excluded from Box 1 but stays in Boxes 3 and 5.
What is Box 12 Code Z?
Code Z is income from a failed 409A plan. For 2025 it is taxed as ordinary income plus an additional 20% federal tax and premium interest. Most software will not calculate the penalty.
Why is my Box 1 lower than Box 3?
Because pretax deferrals reduce Box 1 but not FICA wages. Your 401(k) or 403(b) contributions skip income tax now yet still count for Social Security and Medicare in Boxes 3 and 5.
Is nonqualified deferred comp subject to FICA?
Yes. Under the special timing rule, it is subject to Social Security and Medicare at the later of when services are performed or when it vests — often years before income tax applies.
Can I roll a nonqualified distribution into an IRA?
No. Nonqualified deferred comp distributions are not eligible for rollover. The full amount is taxable wages in the year received and reported in Box 1.
Does my state tax deferred comp?
It varies by state. Many states follow federal treatment of 401(k) deferrals. Nine states, including Texas and Florida, have no income tax, so they tax none of it.
What is the Social Security wage base for 2025?
$176,100 for 2025. Wages above this are not subject to the 6.2% Social Security tax, which is why high earners’ deferrals can escape it under the special timing rule.
Do I get a penalty for over-contributing to my 401(k)?
Yes, if not corrected. Excess deferrals over the 2025 limit of $23,500 are taxed twice unless you request a corrective distribution by April 15, 2026.
What is Form SSA-131?
It is the Employer Report of Special Wage Payments. Your employer files it when you are 62 or older and had a same-year deferral and distribution, protecting your Social Security benefit calculation.