Because of that complexity, the corporate minimum tax has faced substantial skepticism. It is less efficient than simply eliminating deductions or raising the corporate tax rate and could open the door for companies to find new ways to make their income appear lower to reduce their tax bills.
Similar versions of the idea have been floated by Mr. Biden during his presidential campaign and by Senator Elizabeth Warren, Democrat of Massachusetts. They have been promoted as a way to restore fairness to a tax system that has allowed major corporations to dramatically lower their tax bills through deductions and other accounting measures.
According to an early estimate from the nonpartisan Joint Committee on Taxation, the tax would most likely apply to about 150 companies annually, and the bulk of them would be manufacturers. That spurred an outcry from manufacturing companies and Republicans, who have been opposed to any policies that scale back the tax cuts that they enacted five years ago.
Although many Democrats acknowledge that the corporate minimum tax was not their first choice of tax hikes, they have embraced it as a political winner. Senator Ron Wyden of Oregon, the chairman of the Senate Finance Committee, shared Joint Committee on Taxation data on Thursday indicating that in 2019, about 100 to 125 corporations reported financial statement income greater than $1 billion, yet their effective tax rates were lower than 5 percent. The average income reported on financial statements to shareholders was nearly $9 billion, but they paid an average effective tax rate of just 1.1 percent.
“Companies are paying rock-bottom rates while reporting record profits to their shareholders,” Mr. Wyden said.
told the Senate Finance Committee last year. “This behavioral response poses serious risks for financial accounting and the capital markets.”
Other opponents of the new tax have expressed concerns that it would give more control over the U.S. tax base to the Financial Accounting Standards Board, an independent organization that sets accounting rules.
“The potential politicization of the F.A.S.B. will likely lead to lower-quality financial accounting standards and lower-quality financial accounting earnings,” Ms. Hanlon and Jeffrey L. Hoopes, a University of North Carolina professor, wrote in a letter to members of Congress last year that was signed by more than 260 accounting academics.
the chief economist of the manufacturing association. “Arizona’s manufacturing voters are clearly saying that this tax will hurt our economy.”
Ms. Sinema has expressed opposition to increasing tax rates and had reservations about a proposal to scale back the special tax treatment that hedge fund managers and private equity executives receive for “carried interest.” Democrats scrapped the proposal at her urging.
When an earlier version of a corporate minimum tax was proposed last October, Ms. Sinema issued an approving statement.
“This proposal represents a common sense step toward ensuring that highly profitable corporations — which sometimes can avoid the current corporate tax rate — pay a reasonable minimum corporate tax on their profits, just as everyday Arizonans and Arizona small businesses do,” she said. In announcing that she would back an amended version of the climate and tax bill on Thursday, Ms. Sinema noted that it would “protect advanced manufacturing.”
That won plaudits from business groups on Friday.
“Taxing capital expenditures — investments in new buildings, factories, equipment, etc. — is one of the most economically destructive ways you can raise taxes,” Neil Bradley, chief policy officer of the U.S. Chamber of Commerce, said in a statement. He added, “While we look forward to reviewing the new proposed bill, Senator Sinema deserves credit for recognizing this and fighting for changes.”
Emily Cochrane contributed reporting.
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