(ONLINE.WSJ) — President Barack Obama and first lady Michelle Obama paid $112,214 in federal income taxes for 2012 on adjusted gross income of $608,611, an effective rate of 18.4%, the White House said.

The first family’s adjusted gross income—the amount after certain deductions and exemptions—was down from $789,674 the Obamas reported in 2011, when they paid total federal taxes of $162,074, an effective rate of 20.5%.

The decline was due primarily to falling royalties from sales of books Mr. Obama has written, according to tax returns released Friday. The president’s book-related earnings peaked in 2009 when he garnered about $5.6 million from two publications, “The Audacity of Hope” and “Dreams From My Father.” The royalties have fallen over time, to just under $274,000 in 2012.

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