HTS Code 291813: Salts and esters of tartaric acid: — 2026 US Tariff Rates
Data sourced from USITC 2026 Harmonized Tariff Schedule · Last verified May 31, 2026
Quick Answer
HTS 291813 = Salts and esters of tartaric acid:
Duty rate: Free · Unit: 29-digit · Column 1: Free
About This HTS Subheading
This 6-digit Harmonized Tariff Schedule subheading (291813) covers salts and esters of tartaric acid:. The table below lists all 8-digit and 10-digit statistical suffixes under this subheading, including General, Special (Free Trade Agreement), and Column 2 duty rates. Data is sourced from the official USITC 2026 Harmonized Tariff Schedule Revision 9. Always verify final classifications and duty rates with US Customs and Border Protection (CBP) before importing.
Complete Classification Table
All 8-digit and 10-digit tariff codes under HTS subheading 291813. Use this table to find the correct statistical suffix and applicable duty rate for your product.
| HTS Code | Full Description | General Rate | Special Rate | Column 2 Rate |
|---|---|---|---|---|
2918.13.10.00 |
Potassium antimony tartrate (Tartar emetic) | Free | — | 4% |
2918.13.20.00 |
Potassium bitartrate (Cream of tartar) | Free | — | 11% |
2918.13.30.00 |
Potassium sodium tartrate (Rochelle salts) | Free | — | 11.5% |
2918.13.50.00 |
Other | 4.4% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
Duty Estimator
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Quick Answer: HTS 291813 Duty Rates
HTS subheading 291813 (salts and esters of tartaric acid:) contains 4 sub-classifications.
3 suffixes carry duty-free General rates.
Suffix 2918.13.10.00: General rate Free.
Suffix 2918.13.20.00: General rate Free.
Suffix 2918.13.30.00: General rate Free.
Always verify with CBP — Section 301, Section 232, and ADD/CVD may apply.
What Importers Need to Know About HTS Chapter 29
This subheading falls under an HTS chapter covering organic chemicals including hydrocarbons, alcohols, acids, esters, amines, pharmaceutical intermediates, and laboratory reagents. Importers of these products should be aware of the following trade compliance considerations:
Organic chemical imports may be subject to TSCA, FDA (if pharmaceutical grade), or DEA (controlled precursors). Verify regulatory status for your specific compound.
For the specific subheading HTS 291813, we recommend you:
- Verify the correct 10-digit statistical suffix — even within a 6-digit subheading, duty rates can differ significantly between suffixes
- Check FTA eligibility — if your product qualifies for preferential treatment under USMCA, KORUS, or another FTA, you may reduce or eliminate duties by providing the required origin certification
- Monitor for trade remedy changes — Section 301, Section 232, and anti-dumping duties are updated periodically. A rate that was correct last quarter may have changed
- Consult CBP resources — for binding classification rulings, CBP's National Commodity Specialist Division provides written determinations
Frequently Asked Questions About HTS 291813
What is the import duty rate for products under HTS 291813?
Duty rates for HTS 291813 vary by the specific 8- or 10-digit statistical suffix and the country of origin. Suffix 2918.13.10.00 has a General rate of Free. Suffix 2918.13.20.00 has a General rate of Free. Suffix 2918.13.30.00 has a General rate of Free. Always verify the exact duty rate with US Customs and Border Protection before importing, as rates may change and additional trade remedies (Section 301, Section 232, anti-dumping) may apply depending on the country of origin.
Can I get duty-free treatment for goods classified under HTS 291813?
Yes — 3 statistical suffixes under HTS 291813 carry a General rate of Free. Additionally, many products qualify for duty-free treatment under Free Trade Agreements (USMCA, KORUS, and others) even if the General rate is not Free. Check the Special rate column for your specific country of origin. To claim FTA preferences, you must provide the required origin certification documentation.
How do I know if I am using the correct HTS classification?
The correct HTS classification depends on the specific product's composition, function, and in some cases its country of origin. For binding certainty, you can request a written ruling from CBP's National Commodity Specialist Division. Misclassification can result in retroactive duties, penalties under 19 USC §1592, and interest on underpaid amounts. For products classified under heading 291813, the key classification factors include the General Rules of Interpretation (GRI), Section Notes, and Chapter Notes. When in doubt, consult a licensed customs broker.
HTS Chapter 29 Classification Guide: Organic Chemicals
Chapter 29 covers organic chemicals including hydrocarbons, alcohols, acids, esters, amines, pharmaceutical intermediates, and laboratory reagents. This is the largest chapter by number of subheadings in the chemical section. Classification requires identifying the specific organic compound by its chemical structure and functional groups.
Common Misclassification Errors
- Classifying pharmaceutical end products under Chapter 29 — finished medicines and pharmaceutical preparations belong in Chapter 30, not Chapter 29
- Confusing isomers — the HTS often has separate subheadings for different isomers of the same compound, and incorrect isomer identification leads to misclassification
- Not checking for TSCA, FDA, and DEA regulatory requirements, which vary significantly depending on the specific compound and end use
Duty Calculation Tips for HTS 291813
Many organic chemical intermediates qualify for duty-free treatment. Section 301 List 2 (25%) applies to many Chinese-origin organic chemicals. Pharmaceutical intermediates may qualify for duty-free treatment under the WTO Pharmaceutical Agreement. TSCA, FDA, and DEA compliance must be verified for each compound. Consider sourcing from India and EU for lower duty burden.
Chapter 29 Frequently Asked Questions
How are organic chemicals classified differently from pharmaceutical products?
Organic chemicals (Chapter 29) are raw or intermediate chemical compounds. Pharmaceutical products (Chapter 30) are finished medicines, vaccines, and medical preparations. The distinction is based on the product's composition and presentation — a bulk chemical used as a pharmaceutical intermediate is Chapter 29; the same chemical put up as measured doses in retail packaging is Chapter 30.
Do organic chemical imports require TSCA compliance?
Yes. Most organic chemicals imported into the US must be listed on the TSCA Inventory or qualify for an exemption. Importers must certify TSCA compliance at entry. Chemicals not on the TSCA Inventory require EPA premanufacture notice (PMN) review before importation. This process can take 90+ days.
What is the WTO Pharmaceutical Agreement and how does it affect duty rates?
The WTO Pharmaceutical Agreement (also known as the Pharma Agreement) provides duty-free treatment for specified pharmaceutical products, active ingredients, and intermediates. Many organic chemicals used in pharmaceutical manufacturing qualify for duty-free treatment under this agreement, regardless of FTA status.
Are Chinese organic chemicals subject to Section 301 tariffs?
Yes. Many Chinese-origin organic chemicals face Section 301 List 2 additional duties of 25%. This includes many hydrocarbons, alcohols, carboxylic acids, and other compounds. Check the specific HTS subheading against USTR's tariff lists. Some pharmaceutical-grade chemicals may be excluded.
How do I classify a chemical that has multiple functional groups?
Organic chemicals with multiple functional groups are classified under the heading of the functional group that gives the compound its principal character, following the ordering of headings in Chapter 29. If the compound could fall under multiple headings, the heading occurring last in numerical order applies (GRI 3(c)). Consult a chemist for complex compounds.
This HTS classification data is programmatically parsed from the official 2026 US International Trade Commission (USITC) Harmonized Tariff Schedule Revision 9. The PoliteDraft data engine aggregates 8-digit and 10-digit statistical suffixes under their 6-digit subheading parents to create comprehensive, data-rich reference pages. Our editorial team reviews data parsing accuracy against the official USITC source files. This database is provided for informational and preliminary research purposes only. PoliteDraft is not a licensed customs broker or legal advisor.
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