Yes, you report 401(k) withdrawals and employer contributions on your tax return, but the exact line depends on whether the money came out or stayed in

If you took money out of your 401(k) during the year, you must report it on your tax return. Your employer or plan administrator sends you a Form 1099-R in January showing how much you withdrew and how much was withheld for taxes. You enter this information on your Form 1040. If you did not withdraw anything — the money just sat there growing — you do not report the account itself, but you do report any earnings it generated if the account is not tax-deferred.

The confusion usually comes from mixing up three different situations: money you took out (always report), money your employer put in (report only if it was not deducted from your paycheck), and money still in the account (do not report unless you owe a penalty). This guide walks through each one so you know exactly what line to use and when.

Key Takeaways

  • Withdrawals from a traditional 401(k) go on line 5a of Form 1040 as taxable income, using the 1099-R your plan sends you.
  • Employer contributions that were deducted from your paycheck do not get reported again on your tax return — they are already accounted for in your W-2.
  • If you withdrew money before age 59½ without a may have access to reason, you owe a 10 percent penalty on top of income tax, reported on Form 5329.
  • Roth 401(k) withdrawals of contributions (not earnings) are never taxable, but earnings withdrawals are taxable unless you meet the five-year rule and age 59½.
  • If you left your job and did not roll over or withdraw your 401(k) within the required timeframe, you may owe taxes and penalties even if you did not touch the money.

Traditional 401(k) withdrawals and Form 1099-R

When you withdraw money from a traditional 401(k), your plan administrator files a Form 1099-R with the IRS and sends you a copy by January 31. This form shows the total amount withdrawn in Box 1 and the amount withheld for federal income tax in Box 4. You use Box 1 to report the withdrawal on your tax return.

On your Form 1040, you enter the amount from Box 1 of the 1099-R on line 5a (labeled "IRA distributions"). Despite the label saying "IRA," this line is where 401(k) withdrawals go. If the withdrawal was a direct rollover to another 401(k) or IRA — meaning the money went straight from one account to the other without you touching it — the 1099-R will show this in Box 7, and you do not report it as taxable income. Only withdrawals you actually received count as taxable income.

The amount withheld (Box 4) is not separate from the taxable amount — it is tax already paid on your behalf. When you file, the IRS credits you for this withholding. If too much was withheld, you get a refund. If too little was withheld, you owe more tax when you file.

Employer contributions already shown on your W-2

Money your employer put into your 401(k) was already reported to the IRS on your W-2 form in Box 12 (with a code "D" for 401(k) contributions). You do not report this amount again on your tax return. The W-2 is the official record that this money was deducted from your taxable wages, so it has already reduced your income for the year.

The only time you report employer contributions on your tax return is if your employer made a contribution that was not deducted from your paycheck — this is rare and would be noted in your plan documents. If you are unsure whether a contribution was already deducted, check your W-2 Box 12 or ask your employer's payroll department.

Early withdrawal penalties on Form 5329

If you withdrew money from your 401(k) before you turned 59½, you owe a 10 percent early withdrawal penalty on top of regular income tax, unless you meet a narrow list of exceptions. The exceptions include withdrawals due to disability, medical expenses over 7.5 percent of your adjusted gross income, a series of equal payments (called a SEPP), or a may have access to domestic relations order from a divorce.

You report this penalty on Form 5329 (Additional Taxes on may have access to Plans). Your 1099-R will show in Box 7 whether the withdrawal qualifies for an exception. If Box 7 is blank or shows a code other than an exception code, you owe the penalty. You calculate the penalty (10 percent of the taxable withdrawal amount) on Form 5329 and add it to your tax bill when you file Form 1040.

Some employers withhold the penalty automatically, but many do not. Even if tax was withheld from your withdrawal, the penalty may not have been. Check your 1099-R carefully and calculate what you owe before you file.

Roth 401(k) contributions versus earnings

A Roth 401(k) withdrawal is reported on the same 1099-R as a traditional 401(k) withdrawal, but the tax treatment is different. Money you contributed to a Roth 401(k) (your own contributions, not employer matches) can be withdrawn tax-free at any time. Earnings on those contributions are taxable unless you meet two conditions: the account has been open for at least five years, and you are at least 59½ years old.

Your 1099-R will break down the withdrawal into contributions and earnings in Boxes 1 and 2a. Only the earnings portion (Box 2a) is taxable income. If you withdrew earnings before age 59½ and the account is less than five years old, you also owe the 10 percent early withdrawal penalty on the earnings portion. Report this the same way as a traditional 401(k) penalty — on Form 5329.

Loans from your 401(k) and repayment

If you borrowed money from your 401(k) and repaid it on schedule, you do not report anything on your tax return. The loan itself is not taxable income, and the repayment is not a deduction. However, if you left your job before repaying the loan, the outstanding balance is treated as a withdrawal and reported on a 1099-R. You then owe income tax and possibly the 10 percent early withdrawal penalty on that amount.

Some plans allow you a grace period (usually 60 days) to repay a loan after you leave your job. If you repay within that window, the 1099-R may be corrected or not issued. If you miss the important date, the loan is treated as a taxable distribution. Check your plan documents or call your plan administrator to understand your specific loan repayment rules.

Required minimum distributions and Form 1099-R

Once you turn 73 (as of 2023; this age changes based on federal law), you must withdraw a minimum amount from your 401(k) each year, called a required minimum distribution (RMD). This withdrawal is reported on a 1099-R and is taxable income. You report it on line 5a of Form 1040, the same line as other 401(k) withdrawals.

If you do not take your RMD, you owe a penalty equal to 25 percent of the amount you should have withdrawn (this penalty was reduced from 50 percent in 2023). You report this penalty on Form 5329. The IRS calculates your RMD based on your account balance and life expectancy; your plan administrator usually tells you the amount you must withdraw each year.

Frequently Asked Questions

Do I report my 401(k) balance on my tax return?

No. The account balance itself is never reported on your tax return. You only report money that came out of the account during the year. The balance stays between you and your plan administrator unless you withdraw it or owe a required minimum distribution.

What if I did not receive a 1099-R but I withdrew money?

Contact your plan administrator or former employer when ready. The 1099-R must be issued by January 31. If it was lost or delayed, ask for a duplicate. Do not file your tax return without it — the IRS will have a copy, and if your return does not match, you may face penalties and interest.

Can I deduct 401(k) contributions on my tax return?

No. Contributions to a traditional 401(k) are deducted from your paycheck before taxes, so they are already excluded from your taxable income on your W-2. You do not deduct them again. Roth 401(k) contributions are made with after-tax money and are never deductible.

What happens if I roll over my 401(k) to an IRA?

A direct rollover (money transferred straight from the 401(k) plan to an IRA) is not taxable and is not reported as income on your tax return. The 1099-R will show it as a rollover in Box 7. If you took the money yourself and deposited it within 60 days, it is still not taxable, but the 1099-R will show it as a distribution, and you must report the rollover on Form 8606 to avoid being taxed twice.

Do I owe taxes on 401(k) money if I did not withdraw it?

Not on the account itself. You owe taxes only on money that left the account. However, if you are subject to a required minimum distribution and did not take it, you owe a penalty. If you left your job and your employer cashed out your 401(k) without your permission (usually allowed only for balances under $5,000), that cashout is reported on a 1099-R and is taxable.