Final answer:
The highest tax bracket in the United States is currently 37%.
Step-by-step explanation:
The highest tax bracket in the United States is determined by the Internal Revenue Service (IRS) and it changes over time as tax laws are revised. Currently, as of the tax year 2021, the highest income tax bracket in the United States is 37%. This means that individuals or households earning above a certain income threshold are subject to a 37% federal income tax rate on their taxable income.
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