Tariff Signal

U.S. Manufacturing Effective-Tariff Index

Name: U.S. Manufacturing Effective-Tariff Index
Creator: MFG Calcs
License: https://creativecommons.org/licenses/by/4.0/

As of May 2026, the U.S. manufacturing effective tariff rate is 14.96%, an index of 1385.2 against 2014-01 = 100. This is the rate importers actually pay (calculated duties divided by customs value) across a constant 36-family panel, monthly since Jan 2014.

What this measures

The effective tariff rate: total calculated duties paid divided by total customs value, in percent.
The empirical counterpart to the statutory MFN column, reflecting Section 232 and 301 overlays, exclusions, and the product mix actually imported.
A constant 36-family manufacturing panel, so the line moves on policy, not on which families are tracked.
Rebased to an index with the first month (2014-01) set to 100, alongside the raw rate.

How to use it

Download the full monthly history as CSV or JSON and cite it in reports, contracts, or AI answers.
Every input is USITC DataWeb public-domain data, so the series is free to redistribute with attribution.
The effective rate has moved from 1.08% (Jan 2014) to 14.96% (May 2026).

Last reviewed 2026-05-12.