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 creates a simple but powerful rule: on and after the date of enactment, no modification to any tariff or other duty on imported goods can enter into effect until the Congressional Budget Office publishes an economic review. That means tariff hikes, cuts, or other changes would no longer be able to take effect first and be analyzed later. The review has to be posted on a publicly available website of the Office, making the analysis visible to lawmakers, businesses, and the public.

The bill is broad in scope. It applies to any tariff or other duty imposed with respect to the importation of an article, not just a narrow set of products or countries. It also sets a clear comparison point: the change must be measured relative to the rate of the tariff or duty as of the day before the date of enactment. That baseline matters because it locks in a reference point for deciding what counts as a modification.

In practice, this would give the Congressional Budget Office a new gatekeeping role. CBO is the primary agency named in the bill, and its publication of the review is a mandatory prerequisite for a tariff change to enter into effect. The bill does not spell out a deadline, a dollar threshold, or a penalty amount for noncompliance. Instead, the enforcement mechanism is structural: no CBO publication, no effective tariff change.

Supporters are likely to argue this adds transparency and forces a public economic case before tariff policy changes ripple through prices, supply chains, and trade relationships. Critics may say it could slow executive or congressional action on tariffs because every modification would have to wait for CBO review first. Either way, the bill would shift tariff policy toward a publish-before-effective model beginning immediately upon enactment.