Do you know tax calculation of USA?

Taxation in the United States is a complex system which may involve payment to at least four different levels of government and many methods of taxation. United States taxation includes local government, possibly including one or more of municipal, township, district and county governments. It also includes regional entities such as school and utility, and transit districts as well as including state and federal government. Methods of calculating income tax There are two required ways to calculate the U.S. income tax. The "regular tax" is based on the gross income minus any applicable deductions and then a marginal tax percentage is applied according to the taxpayer's income bracket. From this result, any applicable tax credits are subtracted and the result is the income tax owed. If the result is a negative number due to refundable tax credits and/or if the Federal Withholding Tax was greater than the income tax that was actually owed,the taxpayer is entitled to a tax refund. A taxpayer eligible for a refundable credit (such as the earned income tax credit) may receive a refund even without paying any federal income tax. The second way, the "Alternative Minimum Tax" (AMT) is based on the gross income, computed without regard to certain tax preference items (such as tax-exempt interest on certain private activity bonds) and with a reduced number of exemptions and deductions. This higher income base is taxed in two rate brackets, 26% and 28%, depending on taxpayer income The taxpayer pays the higher of the two computed tax liabilities.