You can use resources to help determine your proper W-2 withholding allowances. You should review your current W-4. After reviewing you can visit the IRS.gov website and use their W-4 calculator.
Check Withholding to Avoid Underpayment or Overpayment of Tax
You may want to evaluate your w-4 withholding allowances for 2011. if you received a large refund or paid underpayment penalties with your 2010 tax return, it may be an indication that withholding allowances need to be adjusted. Often a change income or job can effect the withholding allowances.
