There are three types of US taxes, Federal, State & Local. These taxes are distributed to the different agencies that are responsible for each level of tax 
The 2007 individual federal income tax rates are between 10% and 35%, depending on income and family status.
Tax Forums
Here is a complete listing of what forms are responsible for what tax claim :- Form I-9, Employment Eligibility Verification
- Form SS-4, Application for Employer Identification Number
- Form SS-8, Determination of Worker Status
- Form W-2, Wage and Tax Statement
- Form W-2C, Corrected Wage and Tax Statement
- Form W-3, Transmittal of Wage and Tax Statements
- Form W-3C, Transmittal of Corrected Wage and Tax Statements
- Form W-2 and W-3 Instructions
- Form W-4, Employee's Withholding Allowance Certificate
- Form W-4P, Withholding Certificate for Pension or Annuity Payments
- Form W-5, Earned Income Credit Advance Payment Certificate
- Form W-9, Request for Taxpayer Identification Number and Certification
- Form 940, Employer's Annual Federal Unemployment Tax Return
- Form 940EZ, Employer's Annual Federal Unemployment Tax Return
- Form 941, Employer's Quarterly Federal Tax Return
- Form 941, Schedule B, Employer's Record of Federal Tax Liability
- Form 941C, Supporting Statement to Correct Information
- Form 943, Employer's Annual Tax Return for Agricultural Employees
- Form 1040ES, Estimated Tax for Individuals
- Form 1040, Schedule H, Household Employment Taxes
- Form 8850, Pre-Screening Notice and Certification Request for the Work Opportunity and Welfare-to-Work Credits