ReviewU.S. Customs and Border Protection · OtherEffective Sep 23, In force5/5 quoted sentences found in the source

Section 301 duties paid since July 1 on four excluded Chinese product lines can be claimed back by filing a correction from September 23

USTR amended four Section 301 China product exclusions so they match the ten-digit tariff numbers that changed on July 1, 2026, and CBP's systems accept the amended exclusions from noon on September 23. Importers who entered the covered goods between July 1 and September 22 and paid the Section 301 duty can file a Post Summary Correction from September 23 to get the duty back; entries past the correction window can be protested.

Accepted fromnoon on September 23, 2026
Refund routePost Summary Correction (PSC)
Exclusion heading9903.88.69

What the document says

Matched to source. The amended exclusions take effect in CBP's entry system at noon on September 23.
Matched to source. The exclusions apply to goods entered from July 1, when the tariff numbers changed.
Matched to source. Duty already paid can be recovered by a Post Summary Correction, or a protest if the correction window has closed.
Matched to source. CBP gives the worked example: entries from July 1 to September 22 get a correction filed from September 23.
Matched to source. The exclusion heading replaces the Section 301 duty heading on the entry line.

Who does this affect?: Importers of the pump parts and plastic articles covered by U.S. note 20(vvv) exclusions under heading 9903.88.69, and any importer whose broker has been paying Section 301 China duties on goods that qualify for an exclusion because the tariff number changed on July 1.
What it costs: The Section 301 China duties paid on entries filed July 1, 2026 through September 22, 2026 for the four amended exclusions, recoverable by Post Summary Correction filed on or after September 23, 2026.
What to check: If you import Chinese goods under statistical numbers 8413.91.9039, .9046, .9059, .9099, 3926.90.9915, or 3926.90.9920, ask your broker whether the entries since July 1 carried heading 9903.88.69 and, if not, whether a Post Summary Correction can be filed now; CBP's own example says a correction filed on or after September 23 recovers the duty.

The headline, summary, who, cost, and what-to-check lines are our reading of the document, not the document’s words and not advice.

Primary source

CSMS #69990649: GUIDANCE: Section 301 China Conforming Amendment