By Beth Reinhard, Christopher S. Stewart and Rebecca Ballhaus 

Republican Jeb Bush is one of the wealthiest candidates in the 2016 presidential field and pays far more in taxes than the typical American, according to 33 years' worth of tax returns released by his campaign on Tuesday, the most ever by a U.S. presidential candidate.

Mr. Bush said his total net worth is between $19 million and $22 million, 14 times what he reported when he left the Florida governor's office in 2007. That means Mr. Bush--who has earned more than $29 million since leaving office--is likely wealthier than many of his GOP rivals. Mr. Bush's net worth is most likely less than Democratic front-runner Hillary Clinton's, who, in addition to as much as $52 million in assets, has reported earning $25 million with her husband in speaking fees over a recent 16-month period.

His effective federal tax rate hovered around 36% over more than three decades of earnings. The average rate for middle-income households was projected to be 12% in 2013, the latest available data. The top 1% of U.S. earners paid an effective rate of 33%.

The tax rate paid by Mr. Bush, 62 years old, may help inoculate him from the kinds of political attacks faced by 2012 Republican nominee Mitt Romney, from both the Obama campaign and some of his GOP primary rivals. Because Mr. Romney's income came from his work at a private-equity firm, and was taxed at a lower rate, he paid an effective tax rate of 14% in 2011.

Mr. Bush told reporters at a briefing Tuesday that the U.S. needs to lower tax rates and eliminate deductions "that I apparently did not take full advantage of."

"I have to admit that it's a little daunting to be paying 40% of your income in taxes," said Mr. Bush, sitting next to two dictionary-sized binders containing 1,150 pages of tax documents. "It's not something I'm bragging about."

The document release paints a broad picture of Mr. Bush's income during much of his adult life. It rose before he was elected to office, fell during his eight years as Florida governor, then surged in recent years. Since 2007, he has given dozens of paid speeches, joined a private-equity firm, run a private consulting business and served on several corporate boards, including CorMatrix, Rayonier Inc., Swisher Hygiene Inc. and Tenet Healthcare Corp.

Between leaving the governor's mansion in 2007 and 2013, Mr. Bush and his wife, Columba, gave, on average, 1.5% of their income each year to charity. Their charitable giving soared last year, when they donated $308,000, according to a campaign spokesman--more than they had given in the previous three years combined.

In 2013, the Bushes gave $110,000 to charity, while earning $7.2 million. Mr. Bush's money went to the Urban League of Miami, Combat Wounded Veteran Challenge, Knights of Columbus, Ave Maria University and the Green Beret Foundation.

Mr. Romney and his wife, Ann, by contrast, gave more than 19% of their income to charity in 2011, the most recent year for which he has made his tax returns available. Mr. Romney's charitable giving, much of it to the Mormon Church, was unusually high for a presidential candidate.

Mr. Bush's voluntary release of tax information is aimed at reinforcing a broader message being pushed by his campaign--that he is more open with the public than his opponents, particularly Mrs. Clinton. She filed a financial-disclosure form required for presidential candidates but hasn't released any tax returns since her 2008 bid for the White House.

"My hope is to give people a sense of who I am, that my life is one that is not all about politics," Mr. Bush said.

A spokesman for Mrs. Clinton said she would be releasing recent tax documents and that she and former President Bill Clinton have disclosed 30 years' worth of returns through 2006.

Mr. Bush requested an extension to file his financial disclosure, which asks candidates for more details on the sources of their income and assets, but allows them to list dollar ranges instead of specific amounts.

Among the most notable findings of Mr. Bush's returns is his effective tax rate. In 2013 it was about 40%, higher than the 30% rate Mrs. Clinton's campaign said she paid in 2014 and more than double the rate in 2011 paid by Mr. Romney.

Mr. Bush paid a higher rate than most Americans because the bulk of his earnings were reported as ordinary income instead of investment income or income from private equity, which are both taxed at a lower rate.

Joseph Thorndike, a tax historian at newsletter Tax Analysts, said the high rate suggests Mr. Bush wanted to spare himself from criticism over his taxes.

"It's either poor tax planning or very good political planning," Mr. Thorndike said, referring to the overall tax rate. "It's surprising to me that a guy involved in partnerships and LLCs hasn't been able to structure his affairs more tax efficiently."

Mr. Bush's rate rose by about three percentage points after the fiscal-cliff budget deal at the end of 2012 that raised tax rates for high-income Americans. Assuming his income remained the same, that change could have cost Mr. Bush $200,000 in additional taxes in 2013.

Mr. Bush told reporters the bulk of his income in recent years came from two sources: speeches and consulting. He has earned nearly $10 million in speaking fees since 2007, he said, receiving as much as $40,000 per speech in the U.S. and as much as $75,000 overseas. "I made less than Chelsea Clinton," Mr. Bush quipped, referring to published reports that said she earned as much as $65,000 a speech.

Mrs. Clinton and the former president have reported income of $130 million from speaking fees since 2001.

Mr. Bush launched the Coral Gables, Fla., consulting business, Jeb Bush & Associates, with his eldest son not long after leaving the governor's office in 2007.

Over about six years as an adviser for the defunct Wall Street bank Lehman Bros. and later Barclays PLC, Mr. Bush earned, on average, between $1.3 million and $2 million.

The practice of making tax information public dates to 1952, when vice-presidential candidate Richard Nixon challenged opponents to release their returns. Not including the Clintons' combined 30 years, the previous record came from Republican Bob Dole, who over the course of three presidential and vice presidential campaigns released 28 years' worth.

The only other 2016 candidate who has released tax information so far is Republican Carly Fiorina, a former chief executive of Hewlett-Packard Co., who disclosed two years' of returns and a net worth of $59 million.

John D. McKinnon, Andrea Fuller and Rob Barry contributed to this article.

Write to Beth Reinhard at beth.reinhard@wsj.com, Christopher S. Stewart at christopher.stewart@wsj.com and Rebecca Ballhaus at Rebecca.Ballhaus@wsj.com

Corrections & Amplifications

An earlier version of one of the headlines attached to this article incorrectly said Jeb Bush's net worth is between $19 billion and $22 billion.