When Kamala Harris ran for president in 2020, she released 15 years of her personal tax returns, the most of any 2020 presidential candidate. The disclosure offers a glimpse into how Harris, who has emerged as the front-runner for the Democratic presidential nomination after President Joe Biden's sudden withdrawal from the race, became a millionaire as a public servant.

After Harris, in 2014, married Doug Emhoff, who was then an entertainment lawyer, her net worth increased significantly due to the couple's combined assets, a review of her tax records and financial disclosures shows.

Before then, Harris' income came mostly from her public salaries as district attorney of San Francisco and attorney general of California.

Before she was married, the highest annual income reported by Harris was in 2010, when she reported earning $263,000. The next year, when she became attorney general, her reported income dropped to less than $160,000 a year in 2011, 2012 and 2013.

After marrying Emhoff -- whose clients have included retail giant Walmart and health care company Abbott Labs, as well as a Malibu real estate agent who found fame on "The Real Housewives of Beverly Hills" -- Harris' income went up significantly.

As a high-profile attorney for one of the world's largest companies, Emhoff earned more than $1 million per year and held dozens of investments and stocks, according to financial documents reviewed by ABC News.

In 2014, Emhoff owned shares of at least 30 stocks from companies including Home Depot, St. Jude Medical, Comcast, and American Express, according to his statement of economic interest, a form required for California employees.

After Harris announced she would run for U.S. Senate in 2015, Emhoff sold off many of his stocks, including CVS Health and Oracle. Harris won her Senate seat in 2016.

From 2015 until 2019, Emhoff reported dozens of publicly traded investments known as "excepted investment funds," according to annual reports filed by Harris when she was a senator.

As Harris' profile grew, so did her earnings. According to a 2018 annual report filed by Harris, she received an advance of more than $300,000 for her memoir, "The Truths We Hold," and she and Emhoff reported a gross joint income of $1,889,156 that year, according to tax returns.

Before Harris assumed the vice presidency in 2021, Emhoff announced in December 2020 that he would leave his law firm. He joined Georgetown University's law school as a member of faculty, where he has earned nearly $200,000 per year.

As a result of the move, the couple's income dropped significantly, from more than $3 million in 2019 to about $450,000 in 2023.

Nevertheless, with their real estate assets and pension, Forbes estimates Harris and Emhoff's net worth to be about $8 million, up from $7 million in 2021. Property records reviewed by ABC News show Harris sold her Washington, D.C., condo in 2021 for $1.85 million, and the couple currently owns a house in Brentwood, California, that Emhoff purchased in 2012 for $2.7 million.

If Harris becomes the Democratic presidential nominee, she will face former President Donald Trump, who has long fought to keep his tax records private.

Forbes, in its most recent accounting, estimates Trump's net worth to be $5.9 billion, which an earlier breakdown said consists of $2.5 billion mainly from his real estate properties, clubs and resorts, plus the value of his share of Truth Social's parent company, minus the $540 million in legal liabilities from his civil trials over the last year.