The federal income tax is a pay-as-you-go tax. This means you must pay the tax as you earn or receive income during the year.

As a wage earner, you pay federal income tax by having it withheld from your pay during the year. This is your "withholding." Your withholding is based on the number of allowances you claim when you file Form W-4, Employee's Withholding Allowance Certificate, with your employer.

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