If Congress lets a temporary payroll tax cut expire on Dec. 31, workers next year will pay another 2 percentage points of their income on the first $110,100 in wages.
NEW YORK (CNNMoney) -- In two weeks, the payroll tax cut that has saved workers an average of $1,000 this year will expire -- unless lawmakers in the next few days do what both parties swear they want to do and extend it.
This being Congress, however, there is no longer any such thing as simple.
For weeks now, both parties have agreed that the cut should be extended but have been at loggerheads over how to pay for it.
The Senate on Saturday passed a stop-gap bill that would extend the tax cut only through February.
But the bill's fate is highly uncertain. The House was expected to vote on it on Monday night. But the GOP pushed the matter to Tuesday.
Earlier Monday, House Speaker John Boehner predicted the Senate bill would be voted down since he and rank-and-file GOP members objected to the stopgap measure, which would ensure another fight in February, when primary season will be underway.
The failure by Congress to extend the cut would affect everyone's wallet and could hurt the economy.
The impact on your wallet: Thanks to the payroll tax cut, employees only had to pay 4.2% of their first $106,800 in wages into Social Security this year, instead of the normal 6.2%.
If the cut expires, workers in 2012 will pay the extra 2 percentage points of their income up to the wage cap, which next year will be $110,100.
That means low-income workers will pay several hundred dollars more than they're paying now, while high-income workers will pay roughly $2,340 more.
If the cut is extended as is, workers would see no difference in their payroll tax liability next year.
The economy: The payroll tax cut for individuals was originally passed at the end of 2010 to help boost the flagging economy.
Given the disappointingly slow pace of recovery since then, however, many politicians and economists have pushed to keep the tax cut in place for another year.
"This is the medicine that we can use in the near term to help strengthen the recovery and to help to provide insurance against shocks that might be coming," said Alan Krueger, chairman of the president's Council of Economic Advisers, during a White House press briefing earlier this month.
Were the tax cut to expire, many economists say it could take a bite out of their already modest economic growth forecasts for next year and result in job loss. If lawmakers don't extend the cut and they let long-term federal unemployment benefits expire, too, that could reduce economic growth by 1% to 1.5%, they say.
But relative to other ways to spur the economy, some say a general payroll tax cut isn't the best way since it isn't narrowly targeted to low and middle-income households, which are most likely to spend the extra savings.
"[M]any relatively high-income workers -- who are more likely to save rather than spend some of this windfall -- would benefit. And if the idea is to boost the economy by increasing demand for goods and services, giving the money to savers isn't helpful," Urban Institute resident fellow Howard Gleckman wrote in TaxVox.
The Congressional Budget Office estimates payroll tax cuts would generate between 10 and 90 cents in economic activity for every dollar of budgetary cost.
The tax cut could help increase production and jobs, CBO Director Douglas Elmendorf told the Senate Budget Committee earlier this month. But, he added, "those effects would be spread over time [since] CBO expects that the majority of the temporary increase in take-home pay would be saved rather than spent."
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