Members of Congress tend to be far wealthier than the average American, and Ms. Warren is the first presidential hopeful to swiftly release her personal financial disclosure. Ethics rules require presidential candidates to release the financial disclosures within weeks of announcing their candidacy, though candidates are also allowed to ask for an extension (Texas Democrat Julian Castro already has).

[Check out the Democratic field with our candidate tracker.]

Like Ms. Warren, other Democratic contenders have pledged to be similarly transparent throughout the nomination process — in part because they want to draw sharp contrasts with President Trump. Mr. Trump has released his personal financial disclosure form, but a large portion of his financial history remains unknown. Unlike every other president in modern history, he has refused to release his tax returns.

Ms. Warren’s financial disclosure forms were first reported by The Center for Public Integrity in Washington. She has released 10 years of tax returns on her website, stretching back to her first year in public office.

In those forms, Ms. Warren and her husband reported an adjusted gross income of $913,000. The returns listed their total tax as about $268,000 and their total tax payments as $302,227. They were eligible for a refund of $34,000.

On the campaign trail, Ms. Warren frequently mentions her transparency regarding tax returns, and her policy proposal called the “Anti-Corruption and Public Integrity Act,” which would, among other things, require all candidates for federal office to release their taxes before taking office. That same proposal would “end lobbying as we know it,” Ms. Warren says, by eliminating foreign lobbying, ban stock trading from members of Congress, and not allow individuals to frequently rotate between public service jobs and lobbying firms.