Mark Cuban lays out why he believes Donald Trump 'won't and can't' release his taxes

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Mark Cuban

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Mark Cuban.

Billionaire business mogul Mark Cuban took to Twitter on Wednesday to explain why he thinks Republican nominee Donald Trump "won't and can't release his tax returns."

Cuban, the owner of the NBA's Dallas Mavericks and star of ABC's "Shark Tank," used a 2013 deposition from Trump - uploaded by The Washington Post as a part of their "Trump Revealed" project - to make his point.

In that deposition, Trump explained that he sets up single-use subchapter S corporations to develop projects, after being asked about the development of Trump properties in Las Vegas and Chicago. He said he does not use the Trump Organization for those types of projects.

As Cuban pointed out, with a subchapter S corporation, "the entire financial performance of his company becomes part of his tax return."

According to the Internal Revenue Service, S corporation shareholders must "report the flow-through of income and losses on their personal tax returns and are assessed tax at their individual income tax rates." And S corporations are responsible "for tax on certain built-in gains and passive income at the entity level."

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"His personal tax returns would show the financial performance of his development projects," Cuban wrote. "Not good given how much he gets sued."

"It may also explain why reducing pass-through taxes is important to him," he continued. "I say 'may' because taxes are only paid if he makes a profit."

Democratic nominee Hillary Clinton recently hit Trump in a major economic speech for his new tax position on what is known as pass-through income, calling it the "Trump loophole" and arguing that the tax break is extremely beneficial to Trump.

Pass-through income "passes through" the business to the individual returns of its owners. CNBC's Robert Frank cast the loophole as the biggest tax break for the wealthy in Trump's plan. Though analyses have shown that a plan similar to Trump's would aid small businesses, most of its benefits would go to wealthier business owners.

Pass-through income today is taxed at individual rates, with a ceiling of 39.6%. Trump's plan will slash the tax rate for this income to 15%.

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An analysis by the Center on Budget and Policy Priorities showed that the vast majority of pass-through income goes to the top 1% of earners, with the top 400 earners in 2013 acquiring 20% of their total income this way. For those 400 people, that came out to slightly more than $94 million each on average.

Trump has repeatedly insisted he will not release his tax returns until after an audit by the IRS is completed, which he said may or may not be before the November election. Every major party presidential candidate since 1976 has made their tax returns public.

Cuban endorsed Clinton at a rally in Pittsburgh, his hometown, last month. In that rally, he referred to Trump as a "jagoff" - a demeaning slang term frequently used in western Pennsylvania - during the event. Cuban has ripped Trump repeatedly on social media in recent months.

Earlier in the cycle, Cuban expressed interest in serving as either Trump's or Clinton's running mate before souring on the real-estate magnate's candidacy. In a Monday tweet, he wrote that he knew there "was no chance" being picked as a running mate "was happening."

Read Cuban's tweets below:

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