American Citizens and residents are taxed on worldwide income and allowed a credit for foreign taxes. Income subject to tax is determined under tax accounting rules, not financial accounting principles, and includes almost all income from whatever source. Federal tax rates vary from 10% to 39.6% of taxable income. State and local tax rates vary widely by jurisdiction, from 0% to 13.30% of income.
The United States is one of two countries in the world that taxes its nonresident citizens on worldwide income, in the same manner and rates as residents. Taxes in America are very high and you can see the position of American tax payer in the below image who are not rich… lol