The federal income tax is a pay-as-you-go tax. You pay the tax as you earn or receive income during the year.
If you're an employee, your employer probably withholds income tax from your paycheck and pays it to the IRS in your name.
If you don’t pay your taxes through withholding, or don’t pay enough tax that way, you may have to pay estimated tax. People who are self-employed generally pay their tax this way.
Avoid a surprise at tax time and check your withholding amount. Too little can lead to a tax bill or penalty. Too much can mean you won’t have use of the money until you receive a tax refund.
Note: You may use the results from the Tax Withholding Estimator. To change your tax withholding you should: