Some key features of the 2017 Tax Cuts and Jobs Act — including cutting the corporate tax rate to 21 percent — are permanent. But most of the breaks for individuals and households are temporary.

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The 2017 law created a generous deduction for business owners whose business income “passes through” to their personal income tax return (instead of being taxed as corporate income). The provision allows gig workers such as Uber drivers and dog walkers, partners in massive business interests, and others to deduct up to 20 percent of their business income. Some Republicans have concerns about the complex ways this deduction was structured and want to revise it in a 2025 tax bill. Others want to simply renew it to prevent it from expiring.

Extending current law would reduce revenue by $548 billion.