How Pete Buttigieg made his money before he was a presidential hopeful

In a wealthy 2020 Democratic presidential field, Pete Buttigieg lags behind the pack.

The South Bend, Indiana, mayor makes a comfortable living. He and his husband, Chasten, earned $152,643 last year, according to tax returns.

Even so, Buttigieg made the least in 2018 out of the 13 Democratic presidential candidates who have released their tax returns. Former Vice President Joe Biden and his wife, Jill, led the field by raking in $4.5 million, according to tax returns. Sen. Kamala Harris of California and her husband, Douglas Emhoff, followed with $1.9 million.

[CNBC is looking at how top 2020 presidential candidates accumulated their wealth. Read more about how Joe BidenBernie SandersElizabeth Warren and Kamala Harris made their money.]

Sen. Elizabeth Warren of Massachusetts and her husband, Bruce Mann, took in $846,394. Sen. Bernie Sanders of Vermont, and his wife, Jane, made $561,293.