GOP presidential candidate John McCain released his 2006 and 2007 tax returns Friday, showing he earned more than $740,396 in the last two years combined—$45,261 of which comes from Social Security.

The Arizona senator also received $114,854 for his Navy pension.

During those two years McCain paid $157,231 in federal taxes.

McCain donates his royalties from books and Senate pay increases to charity, most of which has gone to the John and Cindy McCain Family Foundation.

The royalties from his books have totaled more than $1.8 million since 1998 and those from his pay increase more than $450,000.

A statement from the campaign about the tax form release states “Beginning in 1991, Senator McCain has also donated the increase in his Senate salary for that year and each subsequent year to charity because he opposed the Congressional pay increase at that time and pledged not to accept the pay raises.”

In 2006 the John and Cindy McCain Family Foundation dispersed $187,639 to various charities which supported education programs, animal welfare and rehabilitation for craniofacial abnormalities. In 2007, the foundation dispersed $78,250 to many of the same groups.

McCain’s wife, Cindy, is a millionairess, but she does not file jointly with her husband. The McCain campaign notes “Senator and Mrs. McCain have kept their personal finances separate throughout their 27-year marriage.”

Cindy McCain’s estimated worth is $100 million.