The U.S. Secret Service does more than protect Vice President Joseph R. Biden Jr. — the agency also pays him rent.

Since April, Mr. Biden has collected more than $13,000 from the agency charged with protecting him and his family for use of a rental cottage adjacent to the waterfront home he owns in a Wilmington, Del., suburb.

Mr. Biden, listed not as vice president in federal purchasing documents but as a “vendor,” is eligible for up to $66,000 by the time the government contract expires in the fall of 2013, the records show.

Officials say the arrangement came about when a previous tenant moved out of the cottage and the Secret Service moved in.