According to a 1962 article from United Press International, he also donated the entirety of the salary he earned during his 14 years in the House and Senate: During Kennedy’s six years as a congressman, eight years as a senator, and nearly two years as president, the total of his salary given to charity will approach $500,000. read more
Other presidents, like Herbert Hoover, also donated their presidential salaries to charity. And, George Washington may have turned away the $25,000 granted him, at least initially, according to the Snopes piece. read more