Republican presidential candidate Mitt Romney paid about three million US dollars in federal income taxes in 2010.
Mr Romney's tax returns show most of his 21.7 million US dollars income came from his investments.
He also gave nearly three million US dollars combined to charitable causes and the Mormon Church, helping reduce his effective tax rate to about 14%.
The former Massachusetts governor has been under pressure in recent weeks to release his tax returns.
Rival Newt Gingrich made public his returns on Saturday, showing he paid almost one million US dollars in income taxes.
Mr Romney's taxes were first reported early this morning in The Wall Street Journal and The Washington Post, which received an advanced copy of the candidate's return.
Mr Romney's campaign plans to discuss his returns in depth with reporters this morning.