Currently, an investor who bought stock for $1,000 in 1980 and sold it for $10,000 today would owe capital gains taxes on the increase in value of $9,000. But under the proposal pitched by Norquist and others, the calculation would start by adjusting up the value of the original purchase to account for inflation — which would reduce the amount of gain that’s taxable after selling the stock.

Although a 1992 Justice Department opinion found that such a change would require an act of Congress, Norquist and other conservatives want the Treasury Department to execute such a policy unilaterally if necessary, providing a major windfall for people selling stocks, art, businesses, homes and other assets.

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It is unclear if the administration is currently considering such a plan.