U.S. federal tax rates for individuals and corporations are available in the U.S. Federal Tax Rates tables.
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1- Tax treaty
See 1- Tax treaty - 
  
2- Sojourning in the U.S.
See 2- Sojourning in the U.S. - 
  
3- U.S. real estate
See 3- U.S. real estate - 
  
4- U.S. estate taxes
See 4- U.S. estate taxes - 
  
5- Individual tax identification number
See 5- Individual tax identification number - 
  
6- Government health insurance plans
See 6- Government health insurance plans - 
  
7- Tax rates
See 7- Tax rates