Steven Mnuchin, the Treasury secretary, said in an interview on the sidelines of the Group of 20 summit meeting in Argentina this month that his department was studying whether it could use its regulatory powers to allow Americans to account for inflation in determining capital gains tax liabilities. The Treasury Department could change the definition of “cost” for calculating capital gains, allowing taxpayers to adjust the initial value of an asset, such as a home or a share of stock, for inflation when it sells.
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Capital gains taxes are overwhelmingly paid by high earners, and they were untouched in the $1.5 trillion tax law that Mr. Trump signed last year. Independent analyses suggest that more than 97 percent of the benefits of indexing capital gains for inflation would go to the top 10 percent of income earners in America. Nearly two-thirds of the benefits would go to the super wealthy — the top 0.1 percent of American income earners.