Straight from the IRS found here:
http://www.irs.gov/newsroom/article/0,,id=204447,00.html
Check Your Withholding
How will the Making Work Pay tax credit affect you?
Most wage earners will benefit immediately or already have with a larger paycheck as a result of the changes made to the federal income tax withholding tables to implement the Making Work Pay tax credit. Some people may find that the changes built into the withholding tables result in less tax being withheld than they prefer.
If you're not eligible for the Making Work Pay tax credit, withholding changes could mean a smaller refund next spring. A limited number of people, including those who usually receive very small refunds, could in some situations owe a small amount rather than receiving a refund. Those who should pay particular attention to their withholding include:
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Pensioners (see more information under Pensioners, below)
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Married couples with two incomes
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Individuals with multiple jobs
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Dependents
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Some Social Security recipients who work
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Workers without valid Social Security numbers
The Making Work Pay tax credit, normally a maximum of $400 for working individuals and $800 for working married couples, is reduced by the amount of any Economic Recovery Payment ($250 per eligible recipient of Social Security, Supplemental Security Income, Railroad Retirement or Veteran's benefits) or Special Credit for Certain Government Retirees ($250 per eligible federal or state retiree) that you receive. If you are affected by this reduction, you should review your withholding to ensure that sufficient funds have been withheld to meet your tax obligation.
If you believe your current withholding is not appropriate for your personal situation, you can perform a quick check using the IRS withholding calculator. If you are not familiar with the withholding calculator, watch this IRS how-to video for instructions. When you have determined your correct withholding, make any adjustments by filing a revised Form W-4, Employee's Withholding Allowance Certificate, with your employer.
Pensioners
Pensioners do not qualify for the Making Work Pay credit, unless they receive earned income. However, because the February withholding tables also apply to pensioners, the IRS has provided pension plans with an optional adjustment procedure. If you are a pensioner with questions about your withholding, contact your pension plan administrator.
If desired, pensioners can adjust their withholding by filing Form W-4P, Withholding Certificate for Pension or Annuity Payments.
Self-Employed
Self-employed individuals can also benefit now from the Making Work Pay tax credit by evaluating their expected income tax liability, allowing for this tax credit if they are eligible, and making the appropriate adjustment in the amount of their regularly scheduled estimated tax payments.
