President Joe Biden’s forthcoming capital gains tax hike proposal would affect only a 0.3% slice of U.S. taxpayers, a top economic aide said on Monday.

Biden is set this week to propose nearly doubling taxes on capital gains to 39.6% for people earning more than $1 million, Reuters has reported, in what would be the highest tax rate on investment gains since the 1920s.

The soon-to-be-announced tax hike will treat those investment gains as wages for top earners and applies only to about 500,000 households, according to Brian Deese, who runs Biden’s policy-writing National Economic Council.

ā€œWe need to do something about equalizing the taxation of work and wealth in this country,ā€ Deese told reporters. ā€œAnd that’s why the reforms that the president will lay out are focused on this top sliver of people.ā€

He said there is no evidence of a significant impact of those capital gains tax rates on long-term investment.

Still, wealth advisers have already started counseling clients on strategies to avoid being clobbered by the new levies, which would need to be approved by a closely divided Congress.

That political process and widespread business group opposition is widely expected to mean a lower tax rate than the White House initially proposes will ultimately be adopted.

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Currently, people earning more than $200,000 pay a capital gains rate of about 23.8%, including the 3.8% net investment tax which helps fund the Affordable Care Act, known as Obamacare.

Under the new plan, wealthy Americans could face an overall federal capital gains tax rate of 43.4% including the Obamacare tax. For some Americans living in New York and California, their total capital gains tax rate could exceed 50% when state taxes are included, according to the Tax Foundation.

(Reporting by Andrea Shalal and Trevor Hunnicutt;Editing by Chris Reese and Andrea Ricci)