This chapter discusses how to pay your U.S. income tax as you earn or receive income during the year. In general, the federal income tax is a pay as you go tax. There are two ways to pay as you go.

1. Withholding. If you are an employee, your employer probably withholds income tax from your pay. Tax may also be withheld from certain other income--including pensions, bonuses, commissions, and gambling winnings. In each case, the amount withheld is paid to the U.S. Treasury in your name.
2. Estimated tax. If you do not pay your tax through withholding, or do not pay enough tax that way, you might have to pay estimated tax. People who are in business for themselves generally will have to pay their tax this way. You may have to pay estimated tax if you receive income such as dividends, interest, rent, and royalties. Estimated tax is used to pay not only income tax, but self-employment tax and alternative minimum tax as well.

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