WASHINGTON — President Obama and Michelle Obama paid $98,169 in taxes on $481,098 in adjusted income last year, tax returns the White House released Friday show. They paid an effective federal income tax rate of 20.4 percent and donated significantly less to charity than they did the year before.

The 42-page document, which included the couple’s Illinois state income tax return, shows the Obamas reported donating $59,251 to 32 charities, which helped lower their overall tax bill. The nearly $60,000 in donations represents 12.3 percent of their adjusted gross income.

But their charitable giving was down sharply from 2012, when the president and first lady reported giving away $150,034.

Their largest charitable gift last year, $8,751, went to the Fisher House Foundation, which supports military families. The Obamas gave the foundation $103,871 in 2012.

The joint tax returns, which the Obamas signed Tuesday, were posted on the White House website on Friday, four days before the April 15 income tax filing deadline.

Income from the sale of Obama’s best-selling books also declined significantly since 2012.

Obama received $31,139 from Random House and $85,041 from Dystel & Goderich Literary Management, for a total of $116,180 in book sales. That combined total compares with $273,739 in similar payments he received in 2012.

Overall, the Obamas had total tax payments of $117,277. They were entitled to a refund of $19,108, but applied it toward their 2014 tax bill instead of pocketing the money.