Sen. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) on Sunday released 15 years of her personal tax returns, more than any other 2020 presidential candidate.

Harris’s campaign released all returns for 2004 through 2018, each year that Harris has held public office.

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A campaign aide said that the decision to release the tax returns makes Harris “the most transparent candidate in the field when it comes to information about personal finances.”

"This is a stark contrast with President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, who refuses to release his tax returns,” the aide said.

The returns show that Harris and her husband, attorney Douglas Emhoff, reported an adjusted gross income last year of just under $1.9 million. The senator reported making $157,352 from her congressional salary, and a net income of $320,125 from sales of her book.

The couple paid over $2.2 million in federal taxes over the past five years, according to the returns.

Harris and her husband had a higher effective tax rate for 2018 than they did in 2017, though their income was also higher.

It is possible that they are among the roughly 5 percent of households who are expected to receive a tax increase in 2018 from President Trump's tax law. The law, which all Democratic lawmakers voted against, caps the state and local tax deduction at $10,000, and Harris and her husband had about $225,000 in state and local taxes in 2018.

In 2018, Harris and her husband donated $27,259 to charity, including $5,000 to Howard University, where the senator went to college, and $20 to Wikipedia.

A number of other 2020 hopefuls, including Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.), Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) and Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.), have released their tax returns in recent weeks. Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) is expected to release his returns on Monday.

The transparency push comes amid heightened congressional efforts to force the publication of President Trump’s financial information that he has refused to release voluntarily.

Earlier this month, House Democrats requested that the IRS provide six years of Trump’s personal and business tax returns.

Treasury Secretary Steven Mnuchin Steven Terner MnuchinOn The Money: Powell, Mnuchin stress limits of emergency loans | House seeks to salvage vote on spending bill | Economists tell lawmakers: Kill the virus to heal the economy Economists spanning spectrum say recovery depends on containing virus Powell, Mnuchin stress limits of current emergency lending programs MORE said Wednesday that the agency was still reviewing the demand and would not meet the deadline. House Ways and Means Committee Chairman Richard Neal Richard Edmund NealRep. Bill Pascrell named chair of House oversight panel Rep. Cedric Richmond set to join House Ways and Means Committee Coons beats back progressive Senate primary challenger in Delaware MORE (D-Mass.) gave the IRS a new deadline of April 23 to comply with the request.

The Trump administration has accused Democrats of using the requests to the IRS for political gain, claiming the demands do not serve a legislative purpose.

--Naomi Jagoda contributed to this report, which was updated at 10:13 a.m.