Employers have a legal responsibility to collect and pay over to the Internal Revenue Service (IRS) taxes withheld from their employees' wages.

In most cases, you still owe the taxes to the IRS even if your employer or payroll department was the one who messed up by not withholding enough taxes during the year. The one exception is if your employer either intentionally or accidentally misclassified you as an independent contractor when you are an employee.

If your employer didn't withhold the correct amount of federal tax, contact your employer to have the correct amount withheld for the future. When you file your return, you'll owe the amounts your employer should have withheld during the year as unpaid taxes.

401(k), 403(b), and other qualified workplace retirement plans: Plan providers typically withhold 20% on taxable distributions—unless the withdrawal is made to satisfy the annual required minimum distributions (RMDs) mandated by the IRS, which conform to IRA withholding rules.

Employers generally must withhold federal income tax from employees' wages.

A payer must withhold 20% of an eligible rollover distribution unless the payee elected to have the distribution paid in a direct rollover to an eligible retirement plan, including an IRA. In the case of a payee who does not elect such a direct rollover, the payee cannot elect no withholding for the distribution.

Taxes on Pension Income You will owe federal income tax at your regular rate as you receive the money from pension annuities and periodic pension payments. But if you take a direct lump-sum payout from your pension instead, you must pay the total tax due when you file your return for the year you receive the money.