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Clinton and her husband Bill, the former president, reported $10.6 million in income for 2015.

They paid $3.6 million in federal income tax, according to the document, which was posted on her campaign .

Over the course of their careers, the Clintons have published all of their tax returns since 1977. Democrats repeatedly point to this as evidence of transparency on the part of the power couple. 

Clinton's running mate Tim Kaine also released his returns for the past 10 years on Friday.

"Donald Trump is hiding behind fake excuses and backtracking on his previous promises to release his tax returns," Clinton campaign communications director Jennifer Palmieri said, "What is he trying to hide?"

Trump has so far declined to release his, arguing that his tax returns for the past several years are being audited.

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But Democrats hint that the brash billionaire real estate mogul may be trying to hide that he pays little to no tax, makes less money than he claims or gives a negligible amount to charity.

Trump, 70, presented the Federal Election Commission with a mandatory personal financial disclosure form in May and says this is enough.

That document gave only an estimate of Trump's assets, liabilities and income. 

Trump has said he is worth more than $10 billion, but no one has been able to confirm this independently.

Forbes magazine estimates Trump is worth less than half that - $4.5 billion. 

In a report published on Friday, The New York Times said Trump had likely benefited from tax breaks available to real estate developers in past years, as in 1978 and 1979, when he paid no federal income tax at all, according to documents he made public in 1981 when applying for a casino license in New Jersey.

The Clintons' main sources of income were Bill Clinton's paid speeches, to the tune of $5.2 million, and a payment to Hillary Clinton from the publisher of her last book, Simon & Schuster, for $3 million.

Hillary Clinton, 68, gave dozens of paid speeches in 2013, 2014 and 2015 but gave up on that before launching her White House run in April 2015. 

The Clintons also donated $1 million to the non-profit foundation that bears their name.

The Clinton foundation had come under fire for receiving hefty donations from governments, including over $25 million from the Kingdom of Saudi Arabia.

Trump had publically urged Clinton to return the money, posting on his : "Crooked Hillary says we must call on Saudi Arabia and other countries to stop funding hate. I am calling on her to immediately return the $25 million plus she got from them for the Clinton Foundation!"

Other donors to the foundation include the UAE and Oman.