Foreign currency that was purchased 10 years ago and revalued would be taxed as ordinary income.
There are seven tax brackets for most ordinary income: 10 percent, 12 percent, 22 percent, 24 percent, 32 percent, 35 percent and 37 percent. The percentage you use depends upon your income. As you move up the pay scale, you also move up the tax scale, since the U.S. has a progressive tax system.
Here is a TurboTax article about tax brackets.
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