An increase in Social Security taxes is leaving Americans with less take-home pay -- and a more negative outlook for the U.S. economy.
The Conference Board said Tuesday that its index of consumer confidence plunged 8.1 points in January from December to 58.6. That's the lowest reading in 14 months and the third straight decline.
The tax increase will leave a household earning $50,000 a year with about $1,000 less to spend in 2013. A household with two high-paid workers will have up to $4,500 less.
The private research group said the tax hike was the key reason consumers felt less confident in January. The survey was conducted through Jan. 17, at which point most people began to realize their paychecks were lighter.
"It may take a while for confidence to rebound and consumers to recover from their initial paycheck shock," said Lynn Franco, The Conference Board's economist.
Consumers also said they felt less optimistic about their job prospects in the next six months. Taxes are rising at a time when hiring is limited and wages are barely growing. The combination is expected to hurt consumer spending and slow economic growth.
"Perhaps more important than the shock to confidence, the hit to income is also likely to show up in a slower pace of consumer spending in the first half of this year," said Thomas Feltmate, an economist at TD Economics.
The index has declined for three straight months since hitting a nearly five-year high of 73.1 in October 2012. It's still above the post-recession low of 40.9 reached in October 2011.
Consumers began to feel less optimistic at the end of the year when it appeared congressional Republicans and President Barack Obama were at an impasse over sharp spending cuts and tax increases. Obama reached a deal with Republicans on Jan. 1 that kept most Americans from seeing higher income taxes. But they postponed decisions on spending cuts and raising the nation's debt limit until later in the year. And they allowed the Social Security tax cut to expire.
"All the negative news about the dysfunction in Washington surrounding the 'fiscal cliff' negotiations contributed to the December plunge, and ongoing shenanigans concerning the debt ceiling and fiscal sanity in general continued to weigh in January," Joshua Shapiro, chief U.S. economist at MFR Inc., said in a note to clients.
Many economists predict economic growth slowed in the October-December quarter to an annual rate of around 1.2 percent. Most say the tax increase will hold back growth in the first quarter of 2013.