Millions of taxpayers started taking home more money in their paychecks this past April thanks to the Making Work Pay Tax Credit. However, changes to the IRS withholding tables cannot take into account single workers with multiple jobs or dual-income married couples for example. All these changes could mean a smaller refund or larger balance due next year. Now is the time to review and adjust your W-4 and ensure that you are withholding the correct amount. This IRS Withholding Calculator can help you avoid an unpleasant surprise come tax time.