Editorial policy and corrections

Standards we hold copy to

• Every factual claim about a code, a rate or a duty column traces to the USITC schedule or to a named CBP publication. Where we explain a rule, we link the authority so you can check it rather than take our word for it.
• We do not publish invented statistics, testimonials, case studies, credentials or success rates. If we have not verified a number, it does not appear on the site.
• Worked examples use real HTS codes and real published rates, with the code shown so the arithmetic can be reproduced.
• We distinguish clearly between what the schedule says and what it means in practice, and we flag the places where practitioners commonly get it wrong rather than restating definitions.

Review cadence

Guides carry a "last reviewed" date. They are re-read in full after each USITC revision and whenever a change in trade policy makes an example misleading. Data pages carry the date the underlying export was loaded — see the methodology page for what that stamp covers.

Corrections

If a rate, description or explanation on this site is wrong, tell us. Use the "report an error" link on any code page, the contact form, or email hello@pmdtc.org. Reports that identify a specific code get looked at first.

Data errors traceable to our processing are fixed and the page's stamp updated. Where the discrepancy is in the source export itself, we say so on the page rather than quietly overwriting the official text. Substantive corrections to a guide are noted at the foot of that guide rather than edited away.

Independence and funding

PMDTC publishes this reference free of charge. There are no sponsored code pages, no paid rankings, no broker referral commissions and no affiliate links in tariff content. If that ever changes, the disclosure will appear on this page before it appears anywhere else on the site.

Use of automation

Code pages are generated programmatically from the official dataset — that is how 29,847 reference pages exist at all. Explanatory writing, chapter introductions and guides are written and reviewed by people, and the derived logic behind rate inheritance and the calculator is documented in the methodology rather than left implicit.