WASHINGTON — The federal government’s budget deficit was $86.0 billion in December, up $8 billion or 10% from the $78.1 billion deficit a year ago, the Treasury Department reported Thursday.

The deficit is higher than the median $82.5 billion estimated by economists.

Outlays totaled $325.9 billion, $11 billion or 3.5% more than the $315.0 billion in December 2010.

Receipts were $240.0 billion, $3 billion or 1.3% higher than the $236.9 billion a year ago.

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