“They charge us a tax or tariff and we charge them,” Trump said during a press event in Oval Office.

The president said that under the plan, the U.S. will treat other countries’ non-tariff policies as unfair trade practices that warrant tariffs in response.

Those include value-added taxes, or VATs, and other practices that the office of the U.S. trade representative deems to be unfair trade limitations.

Trump said that foreign countries will not be allowed to send merchandise or other items to the U.S. through another country.

He also suggested that additional tariffs, including on auto imports, are on the way, Reuters reported.

“We want a level playing field,” Trump said.

VATs are consumption taxes levied at different stages of a supply chain. They are “trade neutral,” the nonpartisan Tax Foundation noted Wednesday in a report accusing the Trump administration of mistakenly blaming VATs for a lack of U.S. competitiveness in Europe.

The reciprocal tariffs will not go into effect immediately. Trump said that Howard Lutnick, his nominee for Commerce secretary, will lead the studies to determine the appropriate tariff levels for each affected country.

Lutnick said in the Oval Office that he expects those studies will be complete by April 1.

In a Truth Social post sent after the event, Trump said his plan will include provisions for “subsidies” and “Nonmonetary Tariffs and Trade Barriers” that other countries employ.

“America has helped many Countries throughout the years, at great financial cost. It is now time that these Countries remember this, and treat us fairly,” Trump wrote.

The new tariffs will follow duties Trump has already slapped on China, Canada and Mexico, as well as on imports of steel and aluminum. Trump’s tariffs on Canada and Mexico are currently on pause after both countries pledged to crack down on illegal crossings and drug trafficking at their respective borders with the U.S.