http://www.irs.gov/Individuals/IRS-Withholding-Calculator
Complete Description:If you are an employee, the Withholding Calculator can help you determine whether you need to give your employer a new Form W-4, Employee's Withholding Allowance Certificate to avoid having too much or too little Federal income tax withheld from your pay. You can use your results from the calculator to help fill out the form.
Funding Agency: Board of Governors of the Federal Reserve System
Type: Calculator;
Language: English
Audience: Individual