What is the duty rate for HTS 310430?

The current 2026 General duty rate for HTS 310430 is Free. Always verify with CBP before importing as Section 301, Section 232, and anti-dumping duties may also apply depending on country of origin.

What products are classified under HTS 310430?

HTS 310430 covers potassium sulfate. This 6-digit Harmonized Tariff Schedule subheading includes 1 8-digit and 10-digit statistical suffixes — see the full classification table on this page for the specific product descriptions and applicable duty rates.

Can I get duty-free treatment for goods classified under HTS 310430?

Many products under HTS 310430 qualify for duty-free treatment under US Free Trade Agreements (USMCA, KORUS, and others) if they meet the applicable rules of origin. Check the Special rate column for your country. FTA preferences require origin certification documentation.

How do I verify the correct HTS classification for my product?

Request a binding ruling from CBP's National Commodity Specialist Division for the most reliable classification. Classification depends on the product's composition, function, and the General Rules of Interpretation (GRI). Consult a licensed customs broker for complex classifications. Misclassification can result in retroactive duties and penalties.

How do I find the correct HTS code for my product?

Start with the General Rules of Interpretation (GRI) and identify your product's function, composition, and form. Check the Section Notes and Chapter Notes for your product's chapter. Use CBP's online CROSS database for published ruling precedents. For binding certainty, request a written ruling from CBP's National Commodity Specialist Division.

What additional duties might apply beyond the base MFN rate?

Three main categories of additional duties may apply: Section 301 tariffs (7.5-25% on Chinese-origin goods), Section 232 tariffs (10-25% on steel and aluminum), and anti-dumping/countervailing duties (ADD/CVD, which vary by product and country). Some products face multiple overlapping duties. Check all applicable trade remedies for your specific product and origin.

Can I reduce or eliminate import duties legally?

Yes, through several strategies: (1) Use Free Trade Agreements — USMCA, KORUS, and other FTAs provide duty-free treatment for qualifying goods; (2) Tariff engineering — legally modify your product's design or materials to qualify for a lower-duty classification; (3) Verify correct classification — overpayment due to misclassification is common and preventable; (4) Apply for Chapter 99 exclusions from Section 301 duties where available.

What is a CBP binding ruling and should I get one?

A CBP binding ruling is a written determination from CBP's National Commodity Specialist Division that establishes the correct HTS classification for your product. It is binding on CBP at all ports of entry. If you import high-value products or products with ambiguous classification, a binding ruling provides legal certainty and protects you from retroactive duty assessments.

How often do HTS duty rates change?

MFN duty rates are relatively stable, changing only through congressional legislation or trade agreement modifications. However, Section 301 tariff rates and exclusions change frequently — USTR updates exclusion lists periodically. Anti-dumping duties are reviewed every 5 years (sunset reviews) but can be modified at any time. Section 232 rates are adjusted by presidential proclamation. Check current rates before each import.

HTS Subheading 2026 Rates 1 sub-classifications

HTS Code 310430: Potassium sulfate — 2026 US Tariff Rates

Quick Answer

HTS 310430 = Potassium sulfate
Duty rate: Free · Unit: 31-digit · Column 1: Free

Complete Classification Table

All 8-digit and 10-digit tariff codes under HTS subheading 310430. 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
`3104.30.00.00`	Potassium sulfate	Free	—	Free

Quick Answer: HTS 310430 Duty Rates

HTS subheading 310430 (potassium sulfate) contains 1 sub-classification. 1 suffix carry duty-free General rates. Suffix 3104.30.00.00: General rate Free. Always verify with CBP — Section 301, Section 232, and ADD/CVD may apply.

Importing Under HTS 310430: What Importers Ask

Does this chemical product require TSCA certification?

Chemical products under this HTS chapter are subject to EPA TSCA (Toxic Substances Control Act) requirements. Verify your substance is listed on the TSCA Inventory. New chemicals require PMN (Pre-Manufacture Notice) submission to EPA at least 90 days before import.

How are pharmaceutical intermediates classified differently from finished drugs?

Pharmaceutical intermediates generally fall under Chapter 29 (organic chemicals), while finished dosage-form drugs fall under Chapter 30. The distinction affects both duty rates and FDA regulatory requirements — finished drugs face higher scrutiny under CDER/CBER.

What safety data sheet (SDS) requirements apply to chemical imports?

OSHA HazCom Standard requires SDS for hazardous chemical imports. CBP may hold shipments without proper SDS documentation. Ensure your foreign supplier provides GHS-compliant SDS in English. Certain chemicals also require EPA or DEA import certification.

At a Glance

All 1 sub-classifications under HTS 310430 are duty-free under the General rate — no tariff applies regardless of country of origin.
This code falls under a chapter covering products classified under this chapter.

What Importers Need to Know About HTS Chapter 31

This subheading falls under an HTS chapter covering products classified under this heading of the Harmonized Tariff Schedule. Importers of these products should be aware of the following trade compliance considerations:

Importers should verify classification with CBP or a licensed customs broker. Check whether Section 301, Section 232, or anti-dumping/countervailing duties apply to your product based on country of origin and specific HTS classification.

For the specific subheading HTS 310430, 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

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Official Sources

PoliteDraft recommends verifying duty rates directly with official government sources before filing import documentation.

PoliteDraft Editorial Team Trade Compliance Writer

Independent editors organize official USITC HTS data and explain how to check the exact suffix, unit, origin, and trade remedies. This site is a research reference, not a customs broker, attorney, or classification opinion.

Data source: USITC HTS 2026 Rev. 19 Last processed: 2026-09-15 Sub-classifications: 1

Related HTS Codes in This Section

310100 310210 310221 310229 310230 310240 310250 310260

Browse All HTS Codes in This Section

See the complete list of HTS subheadings under the same section as 310430.

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<strong>Editorial note:</strong> The first listed General rate for HTS 310430 (Potassium sulfate) is duty-free in this revision. Check every statistical suffix and the Special column for country-specific treatment before filing.