During World War II, the income tax was extended to most workers and the payroll-deduction system for taxes was adopted.

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Before World War II, the income tax was paid by a relatively small number of wealthy individuals. However, to finance the war effort, the U.S. government expanded the tax base to include most workers and introduced the payroll deduction system, where taxes were automatically deducted from workers' paychecks.

During World War II, the Income Tax Was Extended to Most