{
  "name": "U.S. Manufacturing MFN-Free and Reciprocal-Preference HTS Line Coverage",
  "slug": "us-manufacturing-duty-free-routes",
  "version": "2.0.0",
  "url": "https://www.mfgcalcs.com/signals/duty-free-routes",
  "formula": "MFN-Free = the General column is literally Free. Potential reciprocal-preference coverage = a program is attached to a Special rate that is literally Free. Potential base-schedule coverage = either condition. Chapter 99 reference share counts informational footnotes only and makes no applicability inference. All shares are unweighted HTS line counts.",
  "unit": "share of a family's HTS lines, percent.",
  "source": "U.S. International Trade Commission Harmonized Tariff Schedule (HTS) General, Special and footnote fields.",
  "provenance": "Derived entirely from the USITC HTS, a work of the U.S. government in the public domain. Redistributable.",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "MFG Calcs (mfgcalcs.com), compiled from USITC HTS open data",
  "caveats": [
    "These are unweighted shares of HTS rate lines, not shares of import value or observed preference claims.",
    "A Free special rate still requires program eligibility, rules of origin and a valid claim.",
    "Chapter 99 footnote references are informational and may point to an additional duty, an exclusion or another instruction; they do not establish applicability.",
    "Final liability can depend on classification, origin, entry date, exclusions, quotas, Column 2 and AD/CVD. This is not a customs ruling."
  ],
  "asOf": "2026"
}