Although the American colonists fought for independence from British rule and British taxes, once the United States government formed, its main source of revenue was derived from placing customs and excise taxes on the same items that were taxed by Great Britain. In 1812, in an effort to support an expensive war effort, the U.S. government imposed the first sales tax, which was placed on gold, silverware, jewelry and watches. In 1817, internal taxes were terminated and the government relied on tariffs to support itself. It wasn't until 1862 that the United States imposed the first national income tax.
To support the Union Army, Congress passed tax laws in both 1861 and 1862. The office of Commissioner of Internal Revenue was established by the Tax Act of 1862, which stated that the commissioner would have the power to levy and collect taxes. The office was also given the authority to seize property and income in order to enforce the tax laws. These powers remain pretty much the same today, although the IRS will tell you that enforcement tactics have been toned down a bit.
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