Are you an early filer or do you like to wait? I guess some of that depends on whether you are getting money back or you owe! When my clients owe money to the government and we have gone down every route there could possibly be to reduce their taxes, I remind them about their missed October tax planning appointment and we usually look at their withholdings.
An employer requires you to give them information on how much tax needs to be withheld from your paycheck. Based on the information that is provided to them, the employer then proceeds to withhold & submit income taxes on your behalf to the Internal Revenue Service. This information from you is obtained by means of the Form W-4. Read more