As America’s largest Wall Street banks continue to count the billions they’ve already raked in thanks to the Trump-GOP tax law, a government report published Monday shows that America’s millionaires—as well as many rich lawmakers and President Donald Trump himself—are getting ready to share a $17 billion windfall thanks to a last-minute loophole tucked into the Republican plan.

Marketed as relief for “small businesses,” the GOP tax law’s 20 percent deduction for owners of “pass-through” entities like law firms and hedge funds will overwhelmingly benefit the wealthiest Americans, according to an analysist by the Joint Committee on Taxation.

“In 2018, the lion’s share of the benefit—$17.4 billion, or 44.3 percent of the total—will go to roughly 200,000 Americans making $1 million or more who claim the pass-through deduction, the committee said. Another $3.6 billion, or 8.9 percent, will go to a similar number of taxpayers who earn $500,000 to $1 million,” NBC News noted on Monday, summarizing JCT’s findings. “By 2024, the tax deductions will amount to $60.3 billion, and those making $1 million or more will account for $31.6 billion (52.4 percent) of that.”