A large inflow of money into 529 college-savings plan is a potential sign that Congress will act soon to make permanent the tax advantages that these vehicles enjoy, according to The Wall Street Journal.

At the end of last year, assets in 529s swelled to $52.3 billion, a 50% increase from a year earlier, according to the nonprofit College Savings Foundation. While stock market gains were partly responsible for the huge inflow, the bulk of the money came from parents eager to take advantage of a college savings vehicle, whose tax-free status is set to expire on Dec. 31, 2010.

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