It’s nice getting a couple thousand bucks back from the IRS each April, right?  Of course it is, but its nicer to not hand it over to them in the first place if its just going to be coming back to you in a refund.  When you allow your employer to withhold too much, you are essentially loaning your money to the government all year.  Your goal should be to have your employer withhold only enough to cover the taxes you actually owe.  The IRS Withholding Calculator can help you determine how many exemptions you should claim on your W-4.  You may need to go back to the IRS Withholding Calculator when you experience major changes in your life, such as marriage, divorce, death of a dependent, birth of a child, other personal financial changes, or changes in the law.

However, take care that you don’t underwithhold either because if your employer does not withhold enough, then you will find yourself owing the IRS.