HTS 9903.05.28 · Chapter 99 measure
HTS 9903.05.28 applies a +10% additional duty on top of the base HTS rate. It is a Chapter 99 code used together with a base 10-digit HTS code and country of origin to compute total US import duty.
Except for products described in headings 9903.05.85–9903.05.92 and 9903.06.02–9903.06.03, articles the product of Cambodia, as provided for in U.S. note 52 to this subchapter
How the 12.5% is built.
The 12.50% on 9903.05.28 from China is built from 1 measure plus the base rate. Enter your email to see each one, the Chapter 99 subheading behind it, and the rate from every major trading partner.
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1Apply base HTS rateColumn 1 General (MFN) or Special (FTA)
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2Add Section 301 (if origin qualifies)Chapter 99 subheading layered on
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3Add Section 232 / 338 surchargesCountry- and product-scoped measures
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4Add MPF & HMF feesApplied to entered value
Rate by country of origin
Same HTS, very different landed cost. Here's how 9903.05.28 looks from the top trading partners — on a $10,000 shipment.
Same HTS, very different landed cost. Enter your email to see the base rate, the add-ons, and the duty on a $10,000 shipment for each of these origins.
Related HTS codes
Citations for 9903.05.28
FAQ for this HTS code.
What is Chapter 99?
Chapter 99 of the HTS contains temporary and additional duty provisions, including Section 301, Section 232, and IEEPA measures. These codes are reference codes that apply on top of a base HTS code.
Is this code used alone?
No. Chapter 99 codes apply in combination with a base product HTS code. You need both the base code and the Chapter 99 code (and country of origin) to compute total duty.
Why might the rate be "See 9903.xx.xx"?
Some additional measures are reference-only: the exact rate is listed under another Chapter 99 subheading. Use our resolve API with resolve_chapter_99=true to resolve these to numeric rates when available.
How do I calculate duties programmatically?
Use GET /api/v1/tariffs/resolve with hts, origin, and optional as_of. The API returns base tariffs and applicable additional measures. See the API documentation for resolve and query parameters.
Tariff programs explained
Temporary and additional duty provisions that stack on top of a base HTS code.
China list tariffs plus the forced-labor duty that extended Section 301 to roughly 55 origins in July 2026.
National-security tariffs on steel, aluminum, autos, and other covered goods.
Emergency tariffs by country of origin. Struck down February 2026; still returned for historical as_of queries and refunds.
An additional 50% on covered Canadian autos, alcohol, and dairy from 19 August 2026.
Footnotes & requirements
Footnote
See chapter 99 statistical note 1.
For developers
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