Methodology

Data sources

If a file does not store a rate, Sourzi says so. We never fill a gap with a guess.

Sourzi shows what official files say. It is not customs or legal advice. For a binding answer, ask a licensed customs broker, a CBP ruling, or an Australian Border Force Tariff Advice.

File Date stored in the file How often it is checked Links stored in the file
US HTS chapters 28 to 39
us-hts-section-301.json
 2026-09-25T11:27:06.251Z Not stated in the file. https://hts.usitc.gov/reststop/exportList?from=2800&to=3999&format=JSON&styles=falsehttps://hts.usitc.gov/
US HTS heading 9903
us-hts-9903.json
 2026-09-26T14:51:49.417Z Not stated in the file. https://hts.usitc.gov/reststop/exportList?from=9903.00&to=9903.99&format=JSON&styles=falsehttps://hts.usitc.gov/
Section 301 forced labor notice and the stored China line
us-section-301-forced-labor-2026.json
 2026-09-26T14:51:49.417Z Not stated in the file. https://hts.usitc.gov/reststop/exportList?from=9903.00&to=9903.99&format=JSON&styles=falsehttps://www.federalregister.gov/documents/2026/07/28/2026-15181/notice-of-actions-in-section-301-investigations-of-acts-policies-and-practices-of-various-economies
China 12.5 percent line and the exception headings
us-hts-9903-china-forced-labor.json
 2026-09-26T14:51:49.417Z Not stated in the file. https://www.federalregister.gov/documents/2026/07/28/2026-15181/notice-of-actions-in-section-301-investigations-of-acts-policies-and-practices-of-various-economieshttps://www.govinfo.gov/content/pkg/FR-2026-07-28/pdf/2026-15181.pdfhttps://hts.usitc.gov/reststop/exportList?from=9903.00&to=9903.99&format=JSON&styles=falsehttps://hts.usitc.gov/
Heading 9903 footnote map
us-hts-9903-footnote-map.json
 2026-09-26T14:51:49.417Z Not stated in the file. https://hts.usitc.gov/reststop/exportList?from=2800&to=3999&format=JSON&styles=falsehttps://hts.usitc.gov/reststop/exportList?from=9903.00&to=9903.99&format=JSON&styles=falsehttps://hts.usitc.gov/https://ustr.gov/issue-areas/enforcement/section-301-investigations
Heading 9903.88.69 and 9903.88.70 exclusion windows
us-hts-9903-exclusions.json
 2026-09-26T14:51:49.417Z Not stated in the file. https://hts.usitc.gov/reststop/exportList?from=9903.00&to=9903.99&format=JSON&styles=falsehttps://hts.usitc.gov/https://hts.usitc.gov/reststop/exportList?from=2800&to=3999&format=JSON&styles=false
US anti dumping and countervailing orders, China
us-ad-cvd-orders.json
 2026-05-16T23:32:23.566Z Not stated in the file. https://legacy.trade.gov/enforcement/operations/scope/country/china/index.asp
Australia tariff lines
au-tariff-codes.json
 2026-05-16T22:20:11.276Z Not stated in the file. https://www.abf.gov.au/importing-exporting-and-manufacturing/tariff-classification/current-tariff
Australia anti dumping measures
au-ad-measures.json
 2026-05-16T22:23:52.350Z Not stated in the file. https://www.industry.gov.au/anti-dumping-commission/measures-and-decisions/current-measures
DFAT consolidated sanctions list
dfat-sanctions.json
 2026-09-25T11:15:48.246Z Not stated in the file. https://www.dfat.gov.au/international-relations/security/sanctions/consolidated-list
EU REACH Candidate List and Annex XIV
eu-reach-svhc-annex-xiv.json
 2026-05-16T23:47:04.384Z Not stated in the file. https://echa.europa.eu/candidate-list-tablehttps://echa.europa.eu/authorisation-list
AICIS inventory rows
aicis-inventory.json
 2026-05-16T22:31:02.582Z Not stated in the file. https://www.industrialchemicals.gov.au/business/inventory-aicis
AICIS inventory snapshot
aicis-inventory-snapshot.json
 2026-06-08T06:23:27Z Not stated in the file. https://services.industrialchemicals.gov.au/search-inventory/https://services.industrialchemicals.gov.au/_entity/annotation/f6ad25ac-2cf5-938b-9280-52b0b49279b3https://www.industrialchemicals.gov.au/news-and-notices/available-now-download-latest-inventory-snapshot-2-june-2026
EPA non-confidential TSCA inventory
epa-tsca-inventory.json
 2026-07-22 Not stated in the file. https://www.epa.gov/system/files/other-files/2026-05/csv-non-cbi-tsca-inventory.zip
PubChem name to CAS cache
pubchem-name-cas.json
 2026-09-27 Not stated in the file. https://pubchem.ncbi.nlm.nih.gov/rest/pug
CAS flags from stored files
chemical-flags.json
 The file does not store a date. Not stated in the file. The file does not store a link.
EPA TSCA import statements
epa-tsca-import-wording.json
 Last updated on September 8, 2026 Not stated in the file. https://www.epa.gov/tsca-import-export-requirements/tsca-requirements-importing-chemicals
DHS UFLPA Entity List
dhs-uflpa-entity-list.json
 07/31/2026 Not stated in the file. https://www.dhs.gov/uflpa-entity-list
EU CBAM Annex I codes
eu-cbam-scope.json
 2026-05-17T00:57:28.534Z Not stated in the file. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32023R0956https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism_en
China VAT export rebate descriptions
china-vat-export-rebates.json
 2026-05-17T01:05:54.671Z Not stated in the file. http://www.chinatax.gov.cn/http://gss.mof.gov.cn/http://www.customs.gov.cn/https://hts.usitc.gov/reststop/exportList
Korea tariff descriptions
korea-kcs-tariff.json
 2026-05-17T01:11:15.704Z Not stated in the file. https://unipass.customs.go.kr/https://fta.go.kr/https://www.customs.go.kr/https://hts.usitc.gov/reststop/exportList

DHS UFLPA Entity List

The page date stored in the file is 07/31/2026. The file has 3 lists and 205 rows. 193 names are distinct. A name can sit on more than one list. A miss is not a clearance.

  • Section 2(d)(2)(B)(i) 9 rows.
  • Section 2(d)(2)(B)(ii) 47 rows.
  • Section 2(d)(2)(B)(v) 149 rows.

Heading 9903 footnote map

A footnote on a chapters 28 to 39 line is joined to the heading 9903 row with the same code. The chapters file date stored in the map is 2026-09-25T11:27:06.251Z. The heading 9903 file date stored in the map is 2026-09-26T14:51:49.417Z. The map does not add a new date.

The map records 185 footnote citations on 184 chemical lines. The cited 9903 text names none of those lines. No percent is copied onto a chemical line.

The map file is /data/us-hts-9903-footnote-map.json.

9903.88.04

The footnote sits on the description column.

Chemical lines: 2931.90.90.10, 2931.90.90.21, 2931.90.90.25, 2931.90.90.29

The 9903 text names those lines: No.

General rate text: The duty provided in the applicable subheading + 25%

Stored description: Except as provided in headings 9903.88.33, 9903.88.34, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(g) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(g)

The stored rate is not copied onto the chemical lines.

9903.88.04

The footnote sits on the general column.

Chemical lines: 2931.90.90

The 9903 text names those lines: No.

General rate text: The duty provided in the applicable subheading + 25%

Stored description: Except as provided in headings 9903.88.33, 9903.88.34, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(g) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(g)

The stored rate is not copied onto the chemical lines.

9903.90.08

The footnote sits on the other column.

Chemical lines: 180 chemical lines. The codes are in the map file.

The 9903 text names those lines: No.

Other rate text: 35%

Stored description: Articles the product of the Russian Federation, as provided for in U.S. note 30(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 30(b) to this subchapter

The stored rate is not copied onto the chemical lines.

Subheadings named in heading 9903

The heading 9903 file names 8 subheadings in chapters 28 to 39. None of these stored descriptions say Section 301. The rate stays on the 9903 line. It is not copied onto the chemical general rate.

9903.08.04 names 3307.30.50

Bath preparations, other than bath salts (provided for in subheading 3307.30.50)

Stored general rate: 100%

The chapters file has no exact line for 3307.30.50. It stores 3307.30.50.00.

This rate is not copied onto the chemical general rate.

9903.27.02 names 2804.29.00

Rare gases, other than argon (provided for in subheading 2804.29.00)

Stored general rate: 100%

2804.29.00 is in the chapters file and stores general rate 3.7%. 4 longer codes sit under it: 2804.29.00.10, 2804.29.00.20, 2804.29.00.30, 2804.29.00.55.

This rate is not copied onto the chemical general rate.

9903.27.03 names 2825.60.00

Germanium oxides and zirconium dioxide (provided for in subheading 2825.60.00)

Stored general rate: 100%

2825.60.00 is in the chapters file and stores general rate 3.7%. 3 longer codes sit under it: 2825.60.00.10, 2825.60.00.20, 2825.60.00.50.

This rate is not copied onto the chemical general rate.

9903.27.04 names 2849.20.10

Carbides of silicon (provided for in subheading 2849.20.10 or 2849.20.20)

Stored general rate: 100%

The chapters file has no exact line for 2849.20.10. It stores 2849.20.10.00.

This rate is not copied onto the chemical general rate.

9903.27.04 names 2849.20.20

Carbides of silicon (provided for in subheading 2849.20.10 or 2849.20.20)

Stored general rate: 100%

The chapters file has no exact line for 2849.20.20. It stores 2849.20.20.00.

This rate is not copied onto the chemical general rate.

9903.27.05 names 3105.51.00

Other mineral or chemical fertilizers, containing nitrates and phosphates (provided for in subheading 3105.51.00)

Stored general rate: 100%

The chapters file has no exact line for 3105.51.00. It stores 3105.51.00.00.

This rate is not copied onto the chemical general rate.

9903.27.06 names 3206.11.00

Pigments and preparations based on titanium dioxide (provided for in subheading 3206.11.00 or 3206.19.00)

Stored general rate: 100%

The chapters file has no exact line for 3206.11.00. It stores 3206.11.00.00.

This rate is not copied onto the chemical general rate.

9903.27.06 names 3206.19.00

Pigments and preparations based on titanium dioxide (provided for in subheading 3206.11.00 or 3206.19.00)

Stored general rate: 100%

The chapters file has no exact line for 3206.19.00. It stores 3206.19.00.00.

This rate is not copied onto the chemical general rate.

Exclusion windows

These lines are copied from the heading 9903 file dated 2026-09-26T14:51:49.417Z. An exclusion is shown on a chemical line only when the stored text names that line. These lines name 0 chemical subheadings. Chapters 28 to 39 footnotes cite them 0 times. No exclusion is shown on a chemical line.

9903.88.69

Effective with respect to entries on or after June 15, 2024 and through November 9, 2026, articles the product of China, as provided for in U.S. note 20(vvv) to this subchapter, each covered by an exclusion granted by the U.S. Trade Representative

Stored general rate: The duty provided in the applicable subheading

This exclusion is not shown on a chemical line.

9903.88.70

Effective with respect to entries on or after January 1, 2024, and through November 9, 2026, articles the product of China, as provided in U.S. note 20(www) to this subchapter, each covered by an exclusion granted by the U.S. Trade Representative

Stored general rate: The duty provided in the applicable subheading

This exclusion is not shown on a chemical line.

The file is /data/us-hts-9903-exclusions.json.

The PubChem cache stores the CAS strings PubChem returned for 5 names. The first string is not the only CAS. A miss is not a clearance.

The EPA non-confidential TSCA file dated 22 July 2026 has 86,741 rows. 42,698 are active and 44,043 are inactive. Those counts are the rows in the file, and they match the count stated on the EPA download page. A row is a listing. It is not a finding that a chemical is compliant, and a miss is not a clearance.

CAS flags from stored files

These flags use only files already stored. A miss in one file is not a clearance. Not stored yet: Australian drug precursor permit, US pesticide flag, dangerous goods class, forced labour sector list.

TSCA public CAS table. File date 2026-07-22. 70774 CAS rows.

AICIS snapshot. File date 2 June 2026. 39453 rows store a CAS number. 39363 distinct CAS numbers.

REACH Candidate List. File date 2023-01-17. The file count is 233. 214 distinct CAS numbers.

REACH Annex XIV. File date 2025-01-01. The file count is 43. 40 distinct CAS numbers.

formaldehyde. PubChem CID 712.

50-00-0. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

30525-89-4. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

citric acid. PubChem CID 311.

77-92-9. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

60267-61-0. Not in the public CAS table. Not in the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

benzene. PubChem CID 241.

71-43-2. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

26181-88-4. Not in the public CAS table. Not in the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

EDTA tetrasodium. PubChem CID 6144.

64-02-8. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

7379-28-4. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

139-33-3. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

8013-51-2. Not in the public CAS table. Not in the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

edetic acid. PubChem CID 6049.

139-33-3. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

60-00-4. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

688-55-1. Not in the public CAS table. Not in the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

6381-92-6. Not in the public CAS table. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

62-33-9. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

64-02-8. TSCA activity ACTIVE. In the AICIS snapshot. Not in the REACH Candidate List file. Not in the REACH Annex XIV file.

AICIS snapshot

The download name says the snapshot is as at 2 June 2026. The news page was published 15 June 2026. The workbook was created 2026-06-08T06:23:27Z.

The snapshot has 39823 data rows. 39453 store a CAS number. 370 do not. The curated AICIS file still has 317 rows. The snapshot does not replace it. A miss is not a clearance.

Public lookup

The lookup reads the stored duty files and the stored CAS files. It does not add a duty total. A CAS miss is not a clearance. Read the lookup page.

ChAFTA certificate notes

The notes file stores the DFAT item limit and the two page links. The fetched page text did not include a last updated line. The Australia tariff file still does not store a ChAFTA percent. The certificate check compares fields. It does not add a percent.

China chemicals tariff stack

The download lists every eight digit line and every ten digit line in the chapters file. It does not add a US total or an Australian total. Read the stack page.

No dated duty total

A dated China duty total is not printed. The chemical file stores a Column 1 general rate on some lines. The heading 9903 footnotes on those lines do not name the chemical code, so those percents stay on the 9903 row. Heading 9903.05.31 stores an additional 12.5 percent for articles the product of China, with exceptions, and does not name a chemical subheading. Headings 9903.88.69 and 9903.88.70 store exclusion windows and do not name a chemical subheading. The anti dumping file does not store a cash deposit percent. Those parts are not added together.

The chapters 28 to 39 file does not store a Section 301 percent. A heading 9903 percent is not copied onto a chemical line unless that 9903 description names the line. Heading 9903.05.31 stores an additional 12.5 percent for articles the product of China under U.S. note 52, with exceptions. The 28 July 2026 Federal Register notice 2026-15181 states a 12.5 percent Section 301 duty on products of China except Annex I and Annex II. That percent is not copied onto a chemical line.