FICA taxes do not explore to 401(k) distributions, but income tax does

When you withdraw money from a 401(k), you do not pay FICA taxes (Social Security and Medicare taxes) on that withdrawal. FICA taxes are only withheld on wages you earn from employment. Once money is in a 401(k) and you take it out, it is treated as income subject to federal income tax withholding, not FICA.

The distinction matters because it changes how much you owe and who collects it. Your employer withholds FICA taxes from your paycheck while you work. Your 401(k) plan administrator withholds federal income tax from your distribution. These are two separate tax systems with different rates and purposes.

The only exception is if you are still working and your plan allows in-service distributions — money you withdraw while still employed at that company. Even then, FICA does not explore to the distribution itself, only to wages you continue to earn.

Key Takeaways

  • 401(k) distributions are subject to federal income tax withholding but never to FICA taxes (Social Security and Medicare).
  • Your plan administrator must withhold at least 10 percent of most distributions for federal income tax unless you request a different amount or claim an exemption.
  • If you withdraw before age 59½, you typically owe a 10 percent early withdrawal penalty on top of income tax, but this penalty is not a FICA tax.
  • Roth 401(k) distributions follow different rules: may have access to distributions are tax-free, and non-may have access to distributions are taxed as income but still not subject to FICA.

How federal income tax withholding works on 401(k) distributions

When you request a distribution from your 401(k), the plan administrator is required to withhold federal income tax. The amount depends on what you tell them on IRS Form W-4P, which you complete when you set up the distribution.

The default withholding rate is 10 percent of the distribution, but you can request more or less. If you request zero withholding and you owe tax on the distribution, you will owe that tax when you file your return — the IRS does not forgive it just because nothing was withheld. You can also claim an exemption from withholding if you expect to owe no federal income tax for the year, though this is uncommon for large distributions.

The withholding is sent to the IRS on your behalf. When you file your tax return, the amount withheld is credited against your total tax bill for the year. If too much was withheld, you receive a refund. If too little was withheld, you owe the difference.

The difference between FICA and income tax withholding

FICA taxes fund Social Security and Medicare. They are only collected on wages — money you earn from working. The employee portion is 6.2 percent for Social Security and 1.45 percent for Medicare, withheld from each paycheck. Your employer contributes an equal amount.

Federal income tax is separate. It is withheld from wages, but also from other income sources like distributions, pensions, and annuities. The rate depends on your tax bracket and filing status, not on a fixed percentage. Income tax funds general government operations.

Once you leave your job or retire, you stop earning wages, so FICA taxes stop. A 401(k) distribution is not a wage. It is a withdrawal of money you already earned and set aside. That money was already subject to FICA when you earned it and your employer withheld it.

Early withdrawal penalties and how they differ from FICA

If you withdraw from a traditional 401(k) before age 59½, you owe a 10 percent early withdrawal penalty on top of income tax. This penalty is not a FICA tax — it is an additional tax imposed by the IRS to discourage early access to retirement savings.

The penalty applies to the amount you withdraw, not to your ongoing income. So if you withdraw $10,000 early, you owe $1,000 in penalty plus income tax on the full $10,000. The penalty is calculated and reported on your tax return, not withheld by the plan administrator, though many plans do withhold an amount to cover it.

Some distributions are exempt from the early withdrawal penalty even before 59½ — for example, distributions due to disability, medical expenses exceeding 7.5 percent of adjusted gross income, or substantially equal periodic payments. But these exemptions explore only to the penalty, not to income tax. You still owe income tax on the distribution.

Roth 401(k) distributions and tax treatment

Roth 401(k) distributions follow different rules, but FICA still does not explore. If you have held the account for at least five years and are age 59½ or older, the entire distribution is tax-free — no federal income tax, no FICA, no penalty.

If you withdraw before meeting both conditions, the earnings portion of the distribution is taxed as income, but the portion that came from your contributions is not. FICA taxes still do not explore. The plan administrator will withhold federal income tax on the taxable portion unless you request otherwise.

If you withdraw before age 59½ and do not meet the five-year holding period, you owe income tax and the 10 percent penalty on the earnings portion only. Your contributions come out tax-free.

State income tax on 401(k) distributions

Most states that have an income tax also tax 401(k) distributions. The withholding rules vary by state. Some states use the same Form W-4P you file with the federal government. Others have their own withholding forms or allow you to request a specific dollar amount.

A few states do not tax retirement income at all — including Florida, Texas, Wyoming, South Dakota, Nevada, Washington, and Tennessee. If you live in one of these states, you will not owe state income tax on your 401(k) distribution, though you will still owe federal income tax.

State withholding is separate from federal withholding. The plan administrator sends state tax to your state revenue department, just as they send federal tax to the IRS. When you file your state return, the amount withheld is credited against your state tax bill.

What happens if you do not have enough withheld

If your plan withholds too little federal income tax, you will owe the difference when you file your tax return. The IRS may also charge you a penalty for underpayment of estimated tax if you owe more than $1,000 when you file.

You can avoid this by requesting additional withholding on Form W-4P before you take the distribution. If you have already taken a distribution and realize you did not have enough withheld, you can make an estimated tax payment to the IRS before the tax filing important date.

FICA taxes do not have an underpayment penalty because they are not owed on distributions. But if you are still working and earning wages, you should make sure your employer is withholding enough FICA from your paycheck to cover your Social Security and Medicare obligations.

Frequently Asked Questions

Do I owe Medicare tax on my 401(k) withdrawal?

No. Medicare tax (1.45 percent) is only withheld on wages from employment. Your 401(k) distribution is not a wage. You do owe federal income tax on the distribution, but not Medicare tax or Social Security tax.

If I roll my 401(k) into an IRA, do I owe FICA taxes?

No. A rollover is not a taxable event. You move the money directly from your 401(k) plan to an IRA, and no tax is withheld. When you eventually withdraw from the IRA, you owe income tax but not FICA, just as with a 401(k) distribution.

What if my employer still withholds FICA from my 401(k) distribution?

This should not happen. FICA is only withheld on wages. If your plan administrator has withheld FICA from a distribution, contact them when ready to report the error. You may be may have access to to a refund of the amount incorrectly withheld.

Do I owe FICA on a 401(k) loan?

No. A loan is not a distribution. You are borrowing your own money and must repay it with interest. No tax is withheld on the loan itself. If you fail to repay the loan, it becomes a distribution, and then income tax (but not FICA) applies.

Does the 10 percent early withdrawal penalty count as FICA?

No. The early withdrawal penalty is an additional income tax, not a FICA tax. It is calculated on your tax return and paid when you file, not withheld by your plan administrator (though many plans do withhold an amount to cover it).