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The $1.4 trillion item on President Donald Trump’s wish list -- a package of tax cuts for businesses and individuals that he has said he wants to sign before year’s end -- is headed into the legislative equivalent of a Black Friday scrum next week.

Senate Republican leaders plan a make-or-break floor vote on their bill as soon as Thursday -- a dramatic moment that will come only after a marathon debate that could go all night. Democrats are expected to try to delay or derail the measure, and the GOP must hold together at least 50 votes from its thin, 52-vote majority in order to prevail.

Their chances improved this week when Republican Senator Lisa Murkowski of Alaska said she’ll support repealing the “individual mandate” imposed by Obamacare -- a provision that Senate tax writers are counting on to help finance the tax cuts. Murkowski had earlier signaled some reservations about the provision; and her support was widely viewed as a positive sign for the tax bill’s chances.

Trump is scheduled to address Senate Republicans at their weekly luncheon Tuesday afternoon on taxes and the legislative agenda for the rest of the year, according to a statement from Senator John Barrasso, chairman of the Senate Republican Policy Committee.

The White House previously announced that the president would talk with Republican and Democratic congressional leaders at the White House the same day about an agreement on spending to keep the government open after funding expires on Dec. 8. David Popp, a spokesman for Senate Majority Leader Mitch McConnell, and Drew Hammill, a spokesman for House Democratic leader Nancy Pelosi, both said that meeting is still on the schedule.

If the tax bill clears the Senate -- a step that’s by no means guaranteed -- lawmakers in both chambers would have to hammer out a compromise between their differing bills, a process that presents potential pitfalls of its own. For now, though, much of the Senate’s attention will focus on its legislation’s price tag.

Three GOP senators -- Bob Corker of Tennessee, Jeff Flake of Arizona and James Lankford of Oklahoma -- have cited concerns about how the measure would affect federal deficits. Independent studies of the legislation have found that -- contrary to its backers’ arguments -- its tax cuts won’t stimulate enough growth to pay for themselves. Both the Senate bill, and one that cleared the House earlier this month, would reduce federal revenue over a decade by roughly $1.4 trillion, according to the Joint Committee on Taxation.

On Wednesday, a report from the Penn Wharton Budget Model at the University of Pennsylvania said the bill would reduce federal revenue in each year from 2028 to 2033. That finding would mean it doesn’t comply with a key budget rule that Senate Republican leaders want to use to pass their bill with a simple majority over Democrats’ objections.

Budget Rule

In essence, that rule holds that any bill approved via that fast-track process can’t add to the deficit outside a 10-year budget window. The JCT has already found that the Senate bill would generate a surplus in its 10th year because it has set several tax breaks for businesses and individuals to expire.

But JCT hasn’t yet weighed in publicly on the revenue effects in subsequent years. Senate GOP leaders have expressed confidence that their proposal will satisfy the rule ultimately.

Another potential stumbling block stems from the fact that Congress is trying to act on complex tax legislation under a tight, self-imposed timeline in order to deliver on promises from Trump, House Speaker Paul Ryan and McConnell.

For example, Republican Senator Ron Johnson of Wisconsin has said he can’t support the current Senate bill because it would give corporations a tax advantage -- a large rate cut to 20 percent from 35 percent -- that other, closely held businesses wouldn’t get.

‘Change the Most’

His concern centers on the Senate’s plan for large partnerships, limited liability companies, sole proprietorships and other so-called “pass-through” businesses. Under current law, these businesses simply pass their earnings to their owners, who pay income taxes at their individual rates -- currently, as high as 39.6 percent, depending on how much they earn.

Read more: A QuickTake guide to the tax-cut debate

The Senate bill would provide pass-through owners with a 17.4 percent deduction for income -- but in combination with other provisions, that would result in an effective top tax rate for business income that’s more than 10 percentage points higher than the proposed corporate tax rate.

The House bill would use an entirely different approach, setting a top tax rate of 25 percent for pass-through business income, but then limiting how much of a business’s earnings could qualify for that rate.

Reconciling those differences -- and addressing Johnson’s concern -- may be a complicated process. “That’s part of the equation that could change the most over the next few weeks,” Isaac Boltansky, senior vice president and policy analyst at Compass Point Research and Trading LLC, told Bloomberg Tax. “No one is planning around it yet. There is uncertainty across the board.”

Meanwhile, the Obamacare issue looms in the background -- threatening at least one GOP senator’s vote. Susan Collins of Maine said earlier this week that tax bill “needs work,” and “I think there will be changes.”

The 2010 Affordable Care Act -- popularly known as Obamacare -- contained a provision requiring individuals to buy health insurance or pay a federal penalty. Removing that penalty in 2019, as the Senate tax bill proposes to do, would generate an estimated $318 billion in savings by 2027, according to the Congressional Budget Office. The savings would stem from about 13 million Americans dropping their coverage, eliminating the need for federal subsidies to help them afford it.

Because many of the newly uninsured would be younger, healthier people, insurance premiums would rise 10 percent in most years, the nonpartisan fiscal scorekeeper found.

— With assistance by John Voskuhl, and Laura Davison

( Updates with Trump’s visit to Capitol with Senate Republicans in fourth paragraph. )