Section 301 HTS Codes: China Lists, Nicaragua, and Legacy Aircraft Families

Informational only — not legal advice.

If your entry shows a 9903.88, 9903.89, 9903.91, or 9903.92 code, it falls under Section 301 — but these are not interchangeable. Each code family comes from a different USTR investigation, targets different goods, and carries different duty treatment.

The most common mistake: treating Section 301 as synonymous with 9903.88 and the China tariff lists. The China lists are the largest Section 301 family, but not the only one. Collapsing everything into “China 301” leads to misclassified Nicaragua and legacy aircraft lines.

Background on Section 301

Section 301 comes from the Trade Act of 1974. It allows the United States to respond when USTR finds that a foreign country is using acts, policies, or practices that are unreasonable, discriminatory, or otherwise burden U.S. commerce.

Each USTR investigation can generate its own Chapter 99 code family. The China tariff lists dominate the Section 301 footprint, but separate investigations have produced the Nicaragua line and the legacy large civil aircraft family — each with distinct code ranges and duty mechanics.

Current status

As of June 8, 2026:

• the China tariff lists (9903.88.*, 9903.91.*, 9903.92.*) remain the largest active Section 301 family
• the Nicaragua line (9903.89.01) is a separate, live investigation
• legacy aircraft codes (9903.89.05-.63) remain in the schedule
• USTR opened two new Section 301 investigation packages on March 17, 2026: one covering structural excess capacity in 16 economies, and one covering forced labor in 60 economies. USTR's June 2026 forced-labor notice proposes additional duties of 10% or 12.5%, with Annex A exclusions and comments due July 6. No final Chapter 99 HTS implementation code family has been assigned for that proposed action in the reviewed source set.
• USTR's May 6, 2026 China second four-year review notice starts continuation-request windows for existing China actions; it does not assign new Chapter 99 codes.
• USTR's June 2026 Brazil determination and proposed action, Vietnam IP investigation, and China Board of Trade comment process also do not assign final new Chapter 99 code families in this review.

June 2026 proposed-action watch

These items are important, but they should not be entered as current duties until USTR finalizes an action and CBP/USITC implementation language exists:

How to use this page with our HTS tool

1. Click the exact 9903.* code shown on the entry.
2. In the HTS tool, confirm whether it belongs to the China lists, the Nicaragua line, or the legacy aircraft family.
3. Compare it with the base Chapter 1-97 line and any other Chapter 99 overlays on the same entry line.
4. Do not assume “China” just because the code starts with 9903.89 or 9903.91.

Full Section 301 code list

China-focused lists

• 9903.88.01-.28: 9903.88.01, 9903.88.02, 9903.88.03, 9903.88.04, 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.09, 9903.88.10, 9903.88.11, 9903.88.12, 9903.88.13, 9903.88.14, 9903.88.15, 9903.88.16, 9903.88.17, 9903.88.18, 9903.88.19, 9903.88.20, 9903.88.21, 9903.88.22, 9903.88.23, 9903.88.24, 9903.88.25, 9903.88.26, 9903.88.27, 9903.88.28
• 9903.88.33-.70: 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.39, 9903.88.40, 9903.88.41, 9903.88.42, 9903.88.43, 9903.88.44, 9903.88.45, 9903.88.46, 9903.88.47, 9903.88.48, 9903.88.49, 9903.88.50, 9903.88.51, 9903.88.52, 9903.88.53, 9903.88.54, 9903.88.55, 9903.88.56, 9903.88.57, 9903.88.58, 9903.88.59, 9903.88.60, 9903.88.61, 9903.88.62, 9903.88.63, 9903.88.64, 9903.88.65, 9903.88.66, 9903.88.67, 9903.88.68, 9903.88.69, 9903.88.70
• 9903.91.01-.16: 9903.91.01, 9903.91.02, 9903.91.03, 9903.91.04, 9903.91.05, 9903.91.06, 9903.91.07, 9903.91.08, 9903.91.09, 9903.91.10, 9903.91.11, 9903.91.12, 9903.91.13, 9903.91.14, 9903.91.15, 9903.91.16
• 9903.92.10 and 9903.92.80: 9903.92.10, 9903.92.80

Nicaragua

• 9903.89.01: 9903.89.01

Legacy large civil aircraft family

• 9903.89.05-.63 (legacy aircraft pattern): 9903.89.05, 9903.89.07, 9903.89.10, 9903.89.13, 9903.89.16, 9903.89.19, 9903.89.22, 9903.89.25, 9903.89.28, 9903.89.31, 9903.89.34, 9903.89.37, 9903.89.40, 9903.89.43, 9903.89.46, 9903.89.49, 9903.89.50, 9903.89.52, 9903.89.55, 9903.89.57, 9903.89.59, 9903.89.61, 9903.89.63

Common confusions

• Section 301 is not synonymous with 9903.88 alone.
• The current CBP FAQ is China-focused, but the live schedule contains non-China Section 301 families too.
• Presence in the schedule does not, by itself, tell you whether a legacy family is still actively collectible on a given date.

Frequently Asked Questions

Is Section 301 just the 9903.88 China list?

No. While the China tariff lists (9903.88., 9903.91., 9903.92.*) are the most prominent, Section 301 under the Trade Act of 1974 also includes the Nicaragua line at 9903.89.01 and a legacy large civil aircraft family under 9903.89.05 through 9903.89.63. Treating Section 301 as synonymous with 9903.88 risks misclassifying live and legacy lines.

What HTS codes are part of Section 301?

Section 301 includes multiple Chapter 99 families: the China-focused lists at 9903.88.01-.28, 9903.88.33-.70, 9903.91.01-.16, and 9903.92.10/.80; the Nicaragua line at 9903.89.01; and a legacy large civil aircraft family at 9903.89.05 through 9903.89.63. Different investigations generate different code families.

Do the June 2026 Section 301 proposed actions have new HTS codes yet?

No final new Chapter 99 code family has been assigned in the reviewed June 8 source set for the forced-labor proposed action, Brazil proposed action, Vietnam IP investigation, or China Board of Trade comment process. Treat those as proposed or investigative tracks until USTR publishes final HTS implementation language.