The breadth of the subpoena, issued Tuesday, underscores the wide-angle lens prosecutors are taking as they examine the younger Biden’s finances and international business ventures.
Hunter Biden's ties to Burisma in particular have long dogged the policy work and political aspirations of his father, Joe Biden, now the president-elect of the United States. It's unclear whether Hunter Biden's work at the Ukrainian company is a central part of the federal investigation or whether prosecutors are simply seeking information about all his sources of income in recent years.
The person was not authorized to discuss an ongoing investigation publicly and spoke to The Associated Press on condition of anonymity.
A lawyer for the younger Biden, George Mesires, did not immediately return a phone message seeking comment for this story and a spokesman for the Biden transition team declined to comment.
Hunter Biden confirmed Wednesday that his taxes are under federal investigation. The revelation comes at a delicate time for the president-elect, who is building out his Cabinet and will soon decide on his nominee to run the Justice Department, the same department overseeing the investigation into his son.
In addition to the Burisma-related request, the subpoena issued last week also seeks information on Hunter Biden's Chinese business dealings and other financial transactions.