WASHINGTON—The oldest tax return released by Democratic presidential candidate Bernie Sanders offers a lesson in the perils of do-it-yourself tax preparation. The handwritten document contained four mistakes: three that reduced Mr. Sanders’s reported taxes and one that increased them. Had his 2009 returns been prepared correctly, Mr. Sanders should have paid $4,479 more than he did, according to Illinois accountant Glen Birnbaum, who analyzed the returns at the request of The Wall Street Journal.

Source: Wall Street Journal May 08, 2019 09:30 UTC