Washington: US President Obama's filed tax returns show that the annual income of Barack and his wife Michelle has dropped by more than two-thirds to USD 1.73 in 2010 as against USD 5.5 million in 2009.

Obama and the First Lady filed their income tax return jointly and reported an adjusted gross income of USD 1,728,096, White House Press Secretary Jay Carney said in a blog posting on Monday, the last day of filing the tax returns for the year 2010.

"The vast majority of the family's income is the proceeds from the sale of the President's books. The Obamas paid USD 4, 53,770 in total federal tax," he said.

The family also reported donating USD 2, 45,075 – or about 14.2 percent of their adjusted gross income – to 36 different charities.  The largest reported gift to charity was a USD 1, 31,075 contributions to the Fisher House Foundation.

Carney said that the President is donating the after-tax proceeds from his children's book to a Fisher House scholarship fund for children of fallen and disabled soldiers.

The President and Michelle Obama also released their Illinois income tax return and reported paying USD 51,568 in state income taxes, the White House official said.

On the other hand, Vice President Joe Biden and his wife Jill Biden reported an adjusted gross income of USD 3, 79,178. The Bidens paid USD 86,626 in total federal taxes for 2010.

They contributed USD 5,350 to charity, in both monetary and in-kind donations, he added.