The IRS uses information reported on Form W-2 to identify employees with potential withholding compliance problems. What this means is that if a taxpayer chronically claims too many withholding allowances, and generates significant tax balances when they file their return, the IRS may “flag” them. In some cases, if a serious under withholding problem is found to exist for a particular employee, the IRS may issue a lock-in letter to the employer.
How employees get in trouble. While rare, some employees may actually qualify to be “exempt” from having federal income tax withheld from their checks. Unfortunately, most people who indicate to their employer that they are exempt from withholding, usually do so based upon the poor advice of fellow employees, friends or family members.
Form W-4, Employee’s Withholding Allowance Certificate, is used to indicate to your employer how much federal income tax you would like withheld from your paychecks. The greater the number on the W-4, the smaller the amount of taxes they will withhold. If you claim to be exempt, then no federal income taxes are taken out.