The US Treasury posted a $292.65 billion budget deficit in May compared with the $283.1 billion deficit expected in a survey compiled by Bloomberg, but smaller than the $315.65 billion budget deficit a year earlier.
The monthly surplus was $215.02 billion in the April tax month.
Through the first eight months of the fiscal year, the deficit was $1.246 trillion, smaller than the $1.364 trillion deficit in the same period a year ago.