Every President since 1977 has publicly released his full tax returns.
Unfortunately, the law doesn't require them to.
http://www.taxhistory.org/www/website.nsf/web/presidentialtaxreturns
Individual income tax returns — including those of public figures — are private information, protected by law from unauthorized disclosure. Indeed, the Internal Revenue Service is barred from releasing any taxpayer information whatsoever, except to authorized agencies and individuals.
Like all other citizens, U.S. presidents enjoy this protection of their privacy. Since the early 1970s, however, most presidents have chosen to release their returns publicly. In the hope of making this information more widely available, the Tax History Project at Tax Analysts has compiled an archive of presidential tax returns.
In addition, we have made available returns from recent candidates for president, including those running in party primaries. The Tax History Project is currently compiling a more complete archive of candidate returns, and we welcome suggestions on who to include and where to find additional returns.
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