The U.S. first implemented a progressive income tax system in 1862 to fund the Civil War, but the modern framework took shape with the 16th Amendment in 1913. The amendment gave the federal ...

The country’s first income tax was signed into law in 1862 by President Abraham Lincoln to help pay for Civil War expenses. But it wasn’t until 1913 that the states ratified the 16th Amendment ...

The Constitution grants Congress the power to tax, and that authority ... wouldn’t be established until 1862, when the Office of the Commissioner of Internal Revenue under the Treasury ...