US consumer debt up in Dec. on student, auto loans AP 2/7/2013 9:58:31 PM (AP) US consumer debt up in Dec. on student, auto loansBy MARTIN CRUTSINGERAP Economics WriterWASHINGTONAmericans stepped up borrowing in December to buy cars and attend school. But they cut back sharply on credit card use, continuing a trend that could hold back growth this year.Consumer borrowing rose $14.6 billion in December from November to a total of $2.78 trillion, the Federal Reserve said Thursday. That's the highest level on record.The increase was driven entirely by gains in student and auto loans. Borrowing in the category that measures those loans increased $18.2 billion to $1.93 trillion. That's the biggest monthly gain since November 2001.Credit card debt, however, fell $3.6 billion to total roughly $850 billion. Total credit card debt has declined 17 percent since July 2008.Americans have been relying less on their credit cards since the Great Recession. And December's decline could also be a signal that consumers were worried about higher Social Security taxes that began lowering take-home pay this year."High unemployment and the increase in payroll taxes will leave households reluctant to run up big credit card balances," said Paul Edelstein, director of financial economics at Global Insight. "An unwillingness to take on this form of debt will limit the speed at which consumer spending will grow this year."The Federal Reserve's monthly consumer credit report does not separate auto loans from student loans. But according to quarterly data compiled by the Federal Reserve Bank of New York, student loan debt has been the biggest driver of borrowing since the recession.Student loans have risen 63 percent since mid-2008 to total $956 billion as of September of 2012, according to the New York Fed. The increase partly reflects high unemployment, which has led many Americans to seek better education and skills in a more competitive labor market.Auto loans are slightly lower than their total level in mid-2008. But they have risen roughly 9.4 percent since mid-2010 to total $750 billion as of September, according to the New York Fed report.U.S. automakers are coming off their best year for sales in five years, helped by extremely low interest rates that have encouraged more borrowing.Analysts expect credit card debt to stay weak this year. That could slow consumer spending and keep growth weak.One reason is that Americans will have smaller paychecks. Congress and the White House reached an agreement last month to prevent income taxes from rising on most Americans. But the deal did not extend a temporary cut in Social Security taxes, which expired on Jan. 1.The two percentage point increase means a person earning $50,000 a year will have about $1,000 less to spend in 2013. A household with two high-paid workers will have up to $4,500 less.Most economists expect the tax increase could trim the economy's growth by about one-half a percentage point this year.Consumers spent more in December, according to a government report last week, though the increase was slower than in November. Consumer spending drives about 70 percent of the economy.The overall economy actually shrank in the October-December period, dipping at an annual rate of 0.1 percent. It was the first quarterly decline since the recession was ending in the summer of 2009.The Federal Reserve's borrowing report covers auto loans, student loans and credit cards. It excludes mortgages, home equity loans and other loans tied to real estate.