Section 301 China tariffs: how to check if your HTS owes extra duty

You already have (or almost have) an 8- or 10-digit US HTS for a China-origin SKU. This page is a repeatable checklist: verify Section 301 coverage, map the Chapter 1–97 line to the Chapter 99 layer, and read exclusions or modifications for your entry date. Method guide only — not a pasted List 1–4A rate table.

Disclaimer: Educational. Whether Section 301 additional duties apply depends on correct classification, country of origin, the HTS and USTR actions in force on the date of entry, and any applicable exclusions. Confirm with the current USITC HTS, USTR materials, and your broker. Decision support only — not legal advice, not binding on CBP.

What Section 301 means for a China-origin import

Section 301 actions against China can impose additional duties on covered products of China, implemented through Chapter 99 (e.g. 9903.88 families and related U.S. notes). When coverage, origin, and entry date line up, that layer typically sits on top of the Chapter 1–97 Column 1 General rate — it does not replace ch.1–97 classification.

CN callout: 加征 = additional duty beyond the base General rate.

This page = how to check; not a frozen List rate table

USTR and USITC tools show whether a subheading is under an action or modification, which Chapter 99 heading is cited, and whether exclusions change the answer. Those fields move when notices and HTS revisions move. This article teaches where to look and in what order — not List percentages or “owes +X% forever.”

Prerequisite: a credible US HTS first

If you lack a defensible 8-digit rate line (and 10-digit for entry), finish classification first:

→ How to find your US HTS code and read the full duty stack

Return here once you have a candidate subheading to test.

What you need before you search

Correct US HTS (8-digit min; 10 for entry) — not China HS / Schedule B

USTR’s product search expects a US HTS subheading — typically the 8-digit legal rate line. Entry uses the full 10-digit number. A supplier’s China HS, a 6-digit international HS, or a US Schedule B export number is not a substitute. See USITC about the HTS.

Country of origin (301 keyed to origin, not export route)

These China Section 301 additionals are keyed to country of origin, not the last export port. Per CBP’s Section 301 Trade Remedies FAQs: additionals apply to products of the People’s Republic of China (ISO CN); duties follow origin, not export; and goods that are legitimately products of Hong Kong (HK) or Macau (MO) are not subject to those additionals. Do not invent edge cases beyond that FAQ; use a broker when origin is disputed.

CN callout: 原产地 drives the check; third-country routing alone does not rewrite China origin.

Planned entry date / HTS revision in force

Actions, modifications, exclusions, and Chapter 99 notes have effective dates. Confirm the HTS revision for your planned entry on hts.usitc.gov, and re-run USTR/USITC checks close to that date.

Step 1: Search the USTR Section 301 product tool

Open USTR; enter 8-digit

1. Open the USTR Section 301 product search.
2. Enter your 8-digit HTS subheading and search.

USTR identifies covered products by 8- or 10-digit HTS subheadings and returns whether the subheading is subject to the actions plus related duty information. For Lists, exclusions, and later changes: USTR China Section 301 tariff actions hub.

Read result fields — steps only, no everlasting rate %

Treat the result as a live snapshot:

• Which action or modification label appears (List-style labels or later modifications such as four-year review changes — as shown on the live screen).
• The subheading description.
• Any additional-duty indication for that hit.

Record the check date. For training, use a hypothetical or redacted example marked as of [date]; re-check live. Do not copy a percentage into a customer quote as permanent fact.

If no 8-digit yet → Costvanta / USITC / pillar, then return

Without a credible 8-digit, USTR cannot answer coverage. Confirm candidates on hts.usitc.gov, the pillar guide, or Costvanta (EN or CN), then return. Costvanta is decision support only — not a substitute for USTR/live HTS, and not accepted as-is by CBP (data sources).

Step 2: Cross-check with USITC China Tariffs mapping

What the table is (ch.1–97 → Ch.99)

USITC’s China Tariffs convenience file maps ch.1–97 subheadings to Chapter 99 heading(s) for China Section 301. Use it to find the cited Ch.99 provision, then open that provision in the legal text.

Example (confirm release= at use time): China Tariffs — 2026HTSRev1. As of 2026-10-13 Asia/Shanghai that release responds live; re-confirm before each use.

Confirm current release=; convenience mapping ≠ legal text

Per USITC’s HTS FAQs, convenience materials are aids; the authoritative text is the HTS. Confirm release= for your entry date; treat the map as a pointer only.

Open cited Ch.99 heading + U.S. notes in live HTS

On hts.usitc.gov, open the cited Chapter 99 heading and U.S. notes (exclusions, product limits, dates). Decide whether merchandise, origin, and entry date fall inside — or whether an exclusion takes them out.

Step 3: Read exclusions, endnotes, and modifications

Superscript endnotes / exclusion headings / U.S. note 20 style pointers

Ch.1–97 endnotes and “see …” pointers often lead to Chapter 99 exclusion headings or note structures (including U.S. note 20 style pointers). Follow every pointer in the current revision. An old “on the List” PDF is not proof the endnote still applies today.

CN callout: 排除 = limited carve-out with scope and dates, not a forever free pass.

Four-year review / later mods change results — re-check USTR + current HTS

Lists, exclusions, and the four-year review can change which action/modification the product search shows. Re-check USTR search and the live HTS; skip 2018–2019 blog List dumps.

Active exclusion ≠ forever — check effective dates

Exclusions expire, extend, or narrow. Read effective/expiration language in the FR notice and Chapter 99 notes. Escalate to a licensed broker when scope is unclear.

Step 4: How CBP thinks about reporting (awareness)

When 301 applies, report Ch.99 additional-duty classification with ch.1–97

When a Chapter 99 additional applies, CBP ACE sets the order of reporting on the entry summary line: Ch.98 (if any), then Ch.99 additionals (Section 301 Ch.99 first among the trade-remedy sequence described there), then other Ch.99 uses as applicable, then the ch.1–97 classification. Entered value is generally on the ch.1–97 line unless Ch.98 rules say otherwise.

Cite: CBP — Order of reporting multiple HTS in ACE. No invented sample line items or fake HTS strings here.

Point to CBP 301 FAQs for origin / Ch.98 — high-level only

For origin, Chapter 98 interaction, and related topics: CBP Section 301 FAQs (optional hub: Trade Remedies). High-level only: 301 is origin-based; Ch.98 claims can change how additionals apply — read the FAQ and HTS notes, do not improvise.

Full stack reminder

1. Base: Column 1 General on the Chapter 1–97 line.
2. Section 301 Ch.99 (tech-transfer): when coverage + China origin + date + no applicable exclusion line up (this page).
3. Forced-labor Section 301 (9903.05): a separate Chapter 99 family for covered origin economies — see the forced-labor 301 HTS check. China origin may need both checks.
4. Low-value entry path: de minimis suspension does not erase Chapter 99 — commercial parcels under $800 still need an appropriate entry and a 10-digit HTS. See the Section 321 de minimis / low-value entry guide.
5. Landed-cost spreadsheet: after you have General + Chapter 99 placeholders, separate product cost from customs value and apply live MPF/HMF — see How to calculate US import landed cost.
6. Other Ch.99 layers: if other trade-remedy or temporary provisions apply (for metals / derivatives, see the Section 232 metals check).

Effective duty burden is the combination that applies — not General alone. No stacked percentages are invented here. For reading the base line and the full-stack concept:

→ How to find your US HTS code and read the full duty stack

How this differs from Costvanta’s 30-for-30 Insight

The U.S.–China “30-for-30” product-list / HTS check matches a framework product list and Ex-Out limits. This article checks Section 301 additional-duty coverage via USTR → USITC map → live Ch.99 notes → CBP FAQ awareness.

Clear rule: ex-out list check ≠ full Section 301 check. Run both when both questions matter.

Worked mini-walkthrough

Primary: Advertising banner, outdoor, man-made fibers

SKU (hypothetical): Outdoor advertising banner, man-made fibers. Assume a candidate 8-digit from the pillar or Costvanta — not a permanent “on/off 301” fact.

As of 2026-10-13 Asia/Shanghai; re-check live:

1. Origin. China (CN) → continue. Not China → these 301 China additionals are the wrong layer (still verify base classification).
2. USTR. Enter the 8-digit on the USTR product search. Record hit, action/modification label, and date. Do not paste a duty % into quotes.
3. China Tariffs map. Same 8-digit in the USITC China Tariffs file (confirm release=). Note cited Ch.99 heading(s).
4. Live Ch.99 + notes. On hts.usitc.gov, match scope, exclusion headings, and dates to your banner (fiber, construction, printing, condition as imported).
5. Bucket (no %): covered path active → report applicable Ch.99 with ch.1–97 per ACE order and confirm rates only from live sources for that date; exclusion fits → document heading/note/dates/limits and broker-check if value is material; ambiguous → need broker (binding ruling if risk warrants).

Optional sidebar: stainless vacuum flask

Same path for a stainless vacuum flask with China origin: a trusted ch.1–97 code still needs USTR → map → Ch.99 notes → dates. Not a rate table; does not repeat Costvanta’s water-bottle Insight.

Contrast callout: 30-for-30 vs 301

If the same SKU also appears on a framework list in the 30-for-30 Insight, treat that as a separate eligibility question. List match / Ex-Out reading ≠ completion of the Section 301 coverage check above.

What to do next

1. Confirm candidate 8/10-digit HTS and rate structure on https://www.costvanta.com (decision support; verify officially).
2. Re-run USTR search and current China Tariffs / live HTS close to entry.
3. Read Ch.99 notes and exclusion dates before quoting.
4. Use a licensed broker when value, origin, or note scope is high risk; seek a CBP binding ruling when informal tools are not enough.
5. Bookmark data sources so the team knows what to re-verify on USTR/USITC.

CTA: Run the description on https://www.costvanta.com, then finish the 301 path on USTR and the live HTS.

FAQ

Can I use a supplier’s China HS code to search USTR?

No. USTR’s tool uses US HTS subheadings (8-digit search). Convert to a correct US HTS first via hts.usitc.gov, the pillar guide, or Costvanta candidates — then search USTR.

My code was on List 3 in 2019 — is that still true?

Not something this article can certify as eternal fact. Actions and modifications — including four-year review changes — update what the live USTR search shows. Re-check USTR search and the tariff actions hub for your entry date.

Does shipping from Vietnam avoid 301 if origin is China?

CBP’s FAQs emphasize that these Section 301 duties are based on country of origin, not country of export. Shipping route alone does not rewrite China origin. See CBP Section 301 FAQs. Origin disputes belong with a broker.

Is 30-for-30 the same as Section 301?

No. The 30-for-30 Insight covers a framework product-list / Ex-Out style check. This page covers Section 301 additional-duty coverage via USTR, USITC mapping, and Chapter 99. Ex-out list check ≠ full 301 check.

Does Costvanta replace checking USTR / Ch.99?

No. Costvanta helps confirm HTS candidates, path, and rate structure (homepage; data sources). You still verify Section 301 coverage and Chapter 99 legal text on USTR and USITC. Results are not accepted as-is by CBP and are not a binding determination.

Disclaimer: This guide is educational. Whether Section 301 additional duties apply depends on correct classification, country of origin, the HTS and USTR actions in force on the date of entry, and any applicable exclusions. Confirm with the current USITC HTS, USTR materials, and your broker. Costvanta is decision support only — not legal advice, not binding on CBP.