Congress still hasn't dealt with the fiscal cliff and decided what tax rates will be in 2013, leaving companies in the dark about how much to withhold from workers' early January paychecks.
Here's why: Employers that issue paychecks in the first week of January have to cut those checks during Christmas week if not a little sooner.
Problem is, unless Congress passes a fiscal cliff deal by Thursday or Friday of next week, payroll processors will be left wondering how much they should withhold in taxes from employees.
"I wish I knew," said Dennis Danilewicz, senior director of disbursements services at the NYU Langone Medical Center.
Given that negotiations between President Obama and House Speaker John Boehner appear to be making little progress, it's very possible Congress won't pass anything next week.
Without official guidance from Washington, payroll administrators will likely stick to the 2012 withholding tables for paychecks in early January.
"They'll use what they have," said Michael O'Toole, the senior director of government relations for the American Payroll Association.
Indeed, they won't have much of a choice.
Here's why: If the Bush tax cuts expire as scheduled, the lowest tax bracket -- 10% -- will disappear. And only the IRS can tell employers what the new income ranges would be for the 15% bracket and other brackets higher up the scale. (The Treasury Department didn't respond to CNNMoney's requests for comment.)
By sticking with the 2012 withholding tables, there likely would be little change in one's pay from this year at least in terms of income tax rates.
But, overall, workers will see their take-home pay reduced because processors will follow current law regarding the payroll tax, which funds Social Security.
For the past two years, the payroll tax rate -- normally 6.2% -- was reduced to 4.2%. In 2013, it's set to go back to 6.2% on the first $113,700 in wages, up from $110,100 currently.
Effectively that means someone making $50,000 might get about $83 less a month in their paychecks. Someone making twice that would see their pay reduced by roughly $167 a month.
And what if a deal isn't enacted until sometime in January?
"It could be two or three paychecks before you realize what you'll be paid [on a regular basis]," Danilewicz said.
This is especially true if lawmakers decide to extend the payroll tax cut at a rate below 6.2%. Or if they opt to instead create a new tax cut.
And it's especially true for people who make a lot of money because Democrats and Republicans disagree about whether to extend the portion of the Bush tax cuts that apply to income above $200,000 for individuals ($250,000 for married couples).
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