How Is Deferred Compensation Taxed? Income Tax, FICA, W-2 Box 11 and Social Security
How is deferred compensation taxed? Income tax is due at payout as ordinary wages, while FICA is usually due when you earn or vest. Here's how each tax works.
Deferred compensation from a non-qualified (409A) plan is taxed as ordinary income in the year it is paid to you, not the year you earn it. Social Security and Medicare (FICA) taxes work the other way: they are usually due when you earn or vest in the money, so the payout years are generally free of FICA.
That split timing is the single most important thing to understand about how NQDC is taxed. It means deferring postpones your income tax, but it does not save you any payroll tax, and it can change which state gets to tax the money.
This guide walks through each tax in order: federal income tax at payout, FICA at deferral, state tax, withholding, Social Security benefits, and the penalty if a plan breaks the rules. It covers private-employer NQDC plans, not the state and municipal 457(b) plans that are also called "deferred compensation." If you're new to these plans, start with what an NQDC plan is.
Income tax: due at payout, as ordinary income
When you elect to defer salary or bonus into an NQDC plan, that money is left out of your taxable wages for the year. You pay no federal income tax on it until it is paid out under the schedule you elected.
When the payout arrives, every dollar is taxed as ordinary income at your regular federal brackets. That includes the original deferrals and all the investment earnings credited along the way. There is no capital gains treatment, even if your account tracked a stock index fund.
A few related points matter:
- It is still wages. NQDC payouts to employees are reported on Form W-2, even years after you leave the company. Directors and independent contractors who defer fees generally receive a Form 1099 instead.
- No 10% early-withdrawal penalty. The 10% additional tax in IRC section 72(t) applies to qualified retirement plans, which do not include NQDC. A payout at 52 is taxed the same way as one at 67.
- No net investment income tax. Wages are not net investment income, so NQDC payouts are not subject to the 3.8% NIIT, according to the IRS NIIT questions and answers. Earnings in a taxable brokerage account can be.
Why W-2 box 11 shows an amount
Box 11 of Form W-2 reports NQDC distributions that are included in box 1. It also reports earlier deferrals that became FICA wages this year because they vested. Its purpose is to tell the Social Security Administration which part of your wages was really earned in a prior year.
Box 12 code Y (deferrals under a 409A plan) is optional for employers, so you may or may not see it. Box 12 code Z is a red flag: it reports income from a plan that failed 409A, covered below.
FICA: the special timing rule
Social Security and Medicare taxes follow a different clock. Under the FICA special timing rule, deferred amounts count as FICA wages at the later of:
- when you perform the services, or
- when your right to the money is no longer subject to a substantial risk of forfeiture (when it vests).
For ordinary elective deferrals of your own salary or bonus, which are usually vested immediately, that means FICA is due in the year you defer. Your employer withholds it from your other pay that year.
The nonduplication rule: earnings escape FICA
Once a deferral has been counted for FICA, the same regulation says neither that amount nor the income attributable to it is treated as FICA wages again. In an account-balance plan, attributable income generally covers earnings that track a real investment or a reasonable interest rate.
The practical result is that both the growth and the eventual payout are generally FICA-free. One caveat: if your employer fails to apply the special timing rule, the general rule applies, and FICA is due at payment on the principal plus earnings.
What a deferral really costs in FICA
Because FICA is due either way, deferring neither adds to nor saves on payroll tax compared with taking the cash. How much FICA applies depends on where your pay falls:
| Tax | Employee rate | Applies to |
|---|---|---|
| Social Security (OASDI) | 6.2% | Wages up to the 2027 wage base of $192,300 |
| Medicare | 1.45% | All wages, no cap |
| Additional Medicare Tax | 0.9% | Wages above $200,000 single or $250,000 married filing jointly (IRS Topic 560) |
If your other wages already exceed the Social Security wage base, a deferral costs only Medicare tax. Employers must withhold the 0.9% Additional Medicare Tax on wages above $200,000 regardless of filing status, and it applies to NQDC on the same timing as regular Medicare tax.
A worked example (illustrative and simplified)
Suppose you are single, earn a $400,000 salary in 2027 and defer $100,000 of it. This ignores bonuses, state tax and plan earnings.
- Social Security: your FICA wages are still $400,000, well above the $192,300 wage base, so you pay the maximum $11,922.60 whether or not you defer. The deferral adds nothing.
- Medicare: 1.45% of $100,000 = $1,450.
- Additional Medicare: your wages are above $200,000, so 0.9% of $100,000 = $900.
- Federal income tax now: none on the $100,000. Your taxable wages in W-2 box 1 drop to $300,000.
So about $2,350 of payroll tax applies to the deferral in 2027, the same amount you would pay if you took the cash. Years later, when the $100,000 plus its earnings is paid out, you owe ordinary federal income tax and any state tax, but no FICA and no NIIT.
The free NQDC calculator applies these rules year by year, including the wage base, for both the defer path and the take-the-cash path.
State income tax at payout
State income tax generally follows the federal timing: it is due when you are paid. The question is which state.
Usually, the state where you live when the payout arrives taxes it. But the state where you earned the money may also claim the right to tax a nonresident's payout. Federal law, 4 U.S.C. 114, blocks a former state from taxing a nonresident's NQDC only in specific cases, chiefly payouts in substantially equal installments over at least 10 years (or for life). Lump sums and shorter schedules are not protected.
If you plan to move before payouts start, read our guide to deferred compensation and state taxes when you move. It's also a key reason to think hard about lump sum vs installments.
Withholding at payout: watch for a shortfall
Because NQDC payouts are wages, your employer withholds federal income tax on them. Payouts are usually treated as supplemental wages, and many employers withhold at the flat supplemental rate described in IRS Publication 15: 22%, rising to a mandatory 37% on supplemental wages above $1 million in a year.
If your actual marginal rate is higher than 22%, that flat withholding can leave you owing tax in April, and possibly an underpayment penalty. People with a large lump sum or other high income in a payout year often plan for estimated payments or extra withholding. State withholding rules vary.
Effect on Social Security benefits
NQDC interacts with Social Security in two separate ways.
Benefit credit and the earnings test. According to the Social Security Administration's operations manual, deferred amounts are credited as Social Security wages when the services are performed or, if later, when they vest. Once credited, they are never counted again. Payouts of earlier-earned deferred compensation generally do not count against the retirement earnings test, though you may need to tell SSA about them (Form SSA-131).
Taxation of benefits. A payout does raise your adjusted gross income. Under the formula in IRS Publication 915, higher income can make up to 85% of your Social Security benefits taxable. So an NQDC installment that lands in the same years as your benefits can increase the tax on those benefits too. The calculator includes this effect when you enter expected Social Security income during payout.
If the plan violates 409A: 20% plus interest
The deferral only works if the plan follows IRC section 409A in both its written terms and its operation. That includes the deferral election deadlines, the permitted payment events and the ban on accelerating payments.
If a plan fails, all vested amounts deferred under it for that year and prior years become taxable immediately. On top of regular income tax, you owe an additional 20% tax plus a premium interest charge. The income is reported in W-2 box 1 and box 12 code Z. Compliance is the employer's job, but the tax falls on you, which is why the rules are worth knowing.
Your plan document governs how your own deferrals are taxed and paid, so check it, and consult a qualified tax or financial professional before relying on any of this for a decision.
Frequently asked questions
Is deferred compensation taxable?
Yes. NQDC is taxable as ordinary income in the year it is paid to you, including all earnings credited to your account. It is not tax-free, only tax-deferred. Social Security and Medicare taxes are usually paid earlier, in the year you defer or vest.
Is deferred compensation subject to FICA?
Yes, but usually at deferral, not payout. Under the special timing rule, deferrals count as FICA wages when earned or, if later, when vested. After that, the nonduplication rule generally keeps both the deferral and its earnings from being taxed for FICA again.
Is deferred compensation considered earned income?
It's treated as wages. That's why it appears on Form W-2 and is not subject to the 3.8% net investment income tax. For Social Security, it is credited as earnings in the year earned or vested, and later payouts generally don't count against the retirement earnings test.
Is there a penalty for withdrawing deferred compensation early?
There's no 10% early-withdrawal penalty, because NQDC is not a qualified retirement plan. But you can't withdraw whenever you want: payments may only occur on events allowed by 409A, such as separation from service or a fixed date. An improper early payment can trigger the 20% 409A penalty.
Does deferred compensation affect Social Security?
Deferrals are credited to your earnings record once, when earned or vested. Payouts generally don't reduce benefits under the earnings test, but they do raise your income, which can make more of your Social Security benefits taxable.
Why is my NQDC withholding less than my tax bill?
Payouts are often withheld at the 22% flat supplemental rate, which can be lower than your actual marginal rate. If you expect a large payout, you may want to plan estimated payments or extra withholding with a tax professional.