Most other Democratic contenders have pledged to release their tax returns soon.
But the royalties from that book have slowed, and in 2018 Sanders and his wife made $561,293. The retail giant reported $11 billion in USA revenue and claimed a federal income tax rebate of $129 million, giving Jeff Bezos an effective tax rate of -1 percent.
The US$1.7m ($2.5m) puts them in America's highest income brackets, according to tax returns released by the presidential candidate today.
The 2014 tax return shows his salary and an itemized list of deductions and income.
Sanders had faced mounting pressure to release his taxes, with critics saying the democratic socialist's millionaire status undercut his populist economic message.
"I guess the president watches your network a little bit, right?" Sanders has said that as far as his speaking fees go, he donates those to charity. "Hey, President Trump. My wife and I just released 10 years. Please do the same".
Democratic presidential candidate Sen. Bernie Sanders (I-Vt.) on Monday night. "Families in the US earning $421,926 or more a year are part of this group".
Sanders stressed that his wealth is a new development in an accompanying statement. "I consider paying more in taxes as my income rose to be both an obligation and an investment in our country". My view has always been that we need a progressive tax system which demands that the wealthiest people in this country finally start paying their fair share of taxes. Sanders is 77 and his wife is 69. By 2018, his wife, 69, was also taking Social Security, providing the couple with almost $52,000 for the year.
Sanders' status as a millionaire, which he acknowledged last week, was cemented in his 2017 statement.
Sanders and his wife disclosed $36,300 in charitable contributions in 2017, but their return does not detail each individual contribution.
Jane Sanders was a co-founder of the nonprofit, along with her son, David Driscoll, who became the institute's executive director.
A number of Sanders' rivals for the Democratic presidential nomination - including Sens.
Several in the growing field of Democratic 2020 contenders, including Senators Kirsten Gillibrand, Amy Klobuchar, Kamala Harris and Elizabeth Warren, and Governor Jay Inslee of Washington, have released their 2018 returns in recent weeks. He promised to release his 2018 return as soon as possible.
Warren released 10 years of her tax returns last year and followed with an 11th year of released returns last week.