{
  "name": "U.S. Manufacturing Effective-Tariff Index",
  "slug": "us-manufacturing-effective-tariff-index",
  "url": "https://www.mfgcalcs.com/data/us-manufacturing-effective-tariff-index",
  "panel": "A constant 36-family manufacturing panel (families whose monthly archive reaches 2014-01), so panel composition is fixed. The series can still move with product, origin, preference, timing, and other import-mix changes.",
  "formula": "level = USITC Calculated Duties / covered customs value x 100, aggregated across complete panel observations each month. Months with incomplete duty-value coverage are excluded. index = level / level[base period] x 100.",
  "changes": "momPp and yoyPp are the month-over-month and year-over-year changes in the level, in percentage points.",
  "unit": "Level in percent; index unitless with base period = 100.",
  "basePeriod": "2014-01",
  "temporalCoverage": "2014-01/2026-06",
  "source": "U.S. International Trade Commission (USITC) DataWeb — Imports for Consumption: Customs Value and Calculated Duties.",
  "provenance": "Derived entirely from USITC DataWeb, a work of the U.S. government in the public domain. Redistributable; no attribution-encumbered inputs (unlike the MFG Calcs Pulse Index).",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "MFG Calcs (mfgcalcs.com), compiled from USITC DataWeb open data",
  "caveats": [
    "An empirical effective calculated-duty rate, not the statutory MFN column. A difference from MFN cannot by itself be attributed to Section 232, Section 301, or another legal program.",
    "Duties are as reported to USITC; monthly figures can be revised as later data lands.",
    "Pre-2018 months predate the Section 232/301 actions, so the early level is near zero by design, not by omission."
  ],
  "asOf": "2026-06"
}