H.R. 4326: To require the Congressional Budget Office to conduct an economic review of the economic impact of tariff modifications before implementation.

H.R. 4326 sets one rule: starting the day it becomes law, no change to any tariff or import duty can take effect until the Congressional Budget Office posts an economic review on a public website.

That applies to any tariff change, in either direction. A hike, a cut, a tweak — all of it waits for CBO to publish its analysis first. The review has to live on a publicly available CBO website, so lawmakers, businesses, and the public can all read it instead of relying on after-the-fact summaries.

The bill is deliberately broad. It covers any tariff or duty on an imported article, not a single country, industry, or product line. It also pins down a yardstick: a change is measured against whatever the rate was the day before the bill became law, which fixes a reference point for deciding what even counts as a modification.

There's no deadline, no dollar threshold, and no fine written into the text. The enforcement is structural — if CBO hasn't published the review, the tariff change simply can't take effect.

Supporters, led by sponsor Josh Gottheimer, frame this as forcing a public economic case before tariff policy ripples into prices and supply chains. Critics are likely to argue it slows the executive branch and Congress down, since every modification would have to wait on CBO. Either way, the bill would push tariff policy toward a publish-before-effective model.