Americans who sell items through Internet auction sites could be in for an unpleasant surprise at tax time next year, thanks to an IRS proposal designed to identify taxpayers who don’t report income from those sales.

The U.S. Treasury Department wants Congress to force auction sites like eBay, Amazon.com and uBid.com to turn over the identities and Social Security numbers of a large portion of their users to the IRS—so tax collectors know how much each person made through online selling.

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