A new $1.9 billion NFL stadium being planned for Las Vegas could get even more expensive if Republicans in Congress succeed in pushing through a ban on tax-exempt bonds for stadiums in professional sports.

The ban would apply to bonds issued after Nov. 2, according to the Republican tax reform plan unveiled Thursday in the House of Representatives. If it passes, that would affect the financing of the Las Vegas stadium, though it’s not clear how much.

“I am not sure,” said Jeremy Aguero, an analyst who works for the Las Vegas Stadium Authority, which will own and oversee the stadium. “We are evaluating the potential impact if the bonds were converted from tax-exempt municipal bonds to taxable municipal bonds.”

Aguero told USA TODAY Sports on Friday that none of the tax-exempt bonds planned for the stadium have been issued yet.

The Oakland Raiders have been approved to relocate to Las Vegas when the stadium is scheduled to open in 2020.

The project calls for a record $750 million in public funding from an increase in local hotel taxes. Aguero said he couldn’t quantify how much of the stadium cost would be reliant on tax-exempt bonds.

“That will be a function of the amount of pay-go funds generated in advance of the bond issuance and whether there is a single or multiple issuances,” he said.

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Under no circumstances will the public contribution exceed $750 million, according to the Las Vegas Stadium Authority. If the stadium cost goes up, another funding source may need to be to be found.

It could be a big problem. Hypothetically, if the room tax secured $750 million in tax-exempt bonds, sports consultant Marc Ganis estimated the legislation could increase the stadium cost by roughly $100 million. That’s because he said the interest rates would increase if the bonds were taxable instead of tax-exempt.

“If they haven’t gotten it done yet, they’ve now told their bond lawyers and Wall Street, `Get it done right now and beat the new tax code,’” Ganis said.

The current proposal says it's too late for that. The bill would ban tax-exempt bonds after Nov. 2, 2017. But much could change, and the bill might not pass.

“Room tax collections will either be used to pay project costs directly or Clark County will issue stadium bonds on behalf of the (stadium authority) that will be secured by the hotel room tax,” the stadium authority’s website said.

Ganis said this proposal by Congress is designed to “stop and punish” tax-exempt financing for pro sports stadiums. An official estimate for Congress said that eliminating this tax break only would raise tax revenues by $200 million over 2018-2027.

“This is because some people think it is simply wrong for millionaire athletes and billionaire owners to benefit from tax-exempt financing,” Ganis said. “That’s why this is happening. It has nothing to do with raising revenue. The amount they have identified is so small that it is almost invisible.”

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