Customs deadlines, September 2026 to February 2027

Proclamation 11055 applies a 100 percent duty to unmanned aircraft systems over 25 kg maximum takeoff weight, thermal-imaging UAS, docking stations and critical components (Annex I), and 25 percent to UAS at or under 25 kg (Annex II). It bites on goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern time on September 3, 2026. Some trading partners have lower negotiated rates, so read the annexes rather than assuming the headline number. Clause 7 carries a delayed implementation: for companies on the Department of War's Blue UAS Cleared List, the Blue UAS Framework, or the FCC's Conditional Approval List on September 2, 2026, the effective date in clause 1 runs 180 days from the date of the proclamation. Read that clause before assuming the September 3 date applies to you.

CBP's notice for the "Court-Ordered Refunds Under the International Emergency Economic Powers Act Worksheet" is open for public comment until September 8, 2026. The notice describes the refund mechanism: importers submit CSV files of entry summary numbers through the ACE Portal, and CBP processes them in its CAPE tool so multiple entry summaries for one importer produce a single refund. CBP estimates 330,000 respondents for CSV submissions and 33,000 for replacements. The refunds follow the Supreme Court's February 20, 2026 decision in Learning Resources, Inc. v. Trump, which held that tariffs imposed under IEEPA were unlawful.

CBP is reviewing the CBP Form 5106 information on file for importers of record. From September 18, 2026, where the data is inaccurate or incomplete, CBP will void the IOR number, "rendering it invalid for any purpose, including entering imported merchandise into the United States." There is no cure period before the void. CBP then sends written notice to the importer's most recently submitted email address explaining the basis and how to request reestablishment. Two fields cause most of the trouble. The email address "must be valid and belong to the IOR", and "customs brokers or third parties may not supply their own email address." The physical address "must be the actual physical location of the business or individual. It cannot be a registered agent, customs broker, freight forwarder, P.O. box, a business service center."

CBP's test of a new electronic informal entry process for international mail commences on September 22, 2026 and runs until CBP concludes it by a later Federal Register announcement. Entry type 13 covers mail shipments valued at $2,500 or less, filed in ACE with twelve required data elements. The right to make entry is limited to the owner or purchaser of the merchandise, or a licensed customs broker properly appointed by the owner, purchaser or consignee.

Proclamation 11020 took effect on July 31, 2026 for the companies listed in its Annex III, and takes effect on September 29, 2026 for other companies. The proclamation carries company-specific terms, including a reduced rate for companies with approved onshoring plans that rises to 100 percent on April 2, 2030, and a zero rate for companies with most-favored-nation pricing agreements through January 20, 2029.

The merchandise processing fee ad valorem rate stays at 0.3464 percent. Only the dollar limits move: the FY2027 minimum rises to $34.58 and the maximum to $670.86. Informal entry and release fees are $2.77 automated, $8.30 manual, and $12.45 manual prepared by CBP. The annual customs broker permit user fee is $190.88.

The interim final rule that suspended the de minimis exemption for mail set a delayed compliance date: "The compliance date for 19 CFR 145.12(a)(2)(v) and (vi) is on October 22, 2026." After that date, mail shipments carrying partner government agency data requirements, duties under Chapter 98 or 99 of the HTSUS, or a claim for duty-free treatment under Chapter 98 or a free trade agreement must use formal entry rather than the informal postal process.

USTR's December 1, 2025 notice extended 178 product exclusions "through 11:59 p.m. eastern daylight time on November 9, 2026." They are claimed under HTSUS subheading 9903.88.69 (U.S. notes 20(vvv)(i) through (iv)) and 9903.88.70 (U.S. note 20(www)). As of September 2, 2026 no further extension has been published in the Federal Register.

Executive Order 14411, "Strengthening Customs Enforcement," was signed June 3, 2026. Its 180-day clock runs out on November 30, 2026. By then DHS is directed to issue or amend regulations on importer of record eligibility, minimum assets and bonding levels, and expanded data disclosures. For foreign importers of record, the order directs that they be prohibited from filing informal entry under 19 U.S.C. 1498, that they "may not rely on a continuous bond to meet the bond requirements for entry, except as permitted by CBP", and that they "be validated in CBP's Customs Trade Partnership Against Terrorism (CTPAT), if determined by CBP to be eligible, or use a CTPAT validated and licensed customs broker to file entries."

CBP published "Heightened Import Disclosures for Supply Chain Visibility" on September 2, 2026 at 91 FR 56408, as an advance notice of proposed rulemaking under docket USCBP-2026-1058, RIN 1685-AA47. An ANPRM contains no proposed regulatory text. CBP is asking for input on requiring foreign export documentation, on identifying the parties to an importation through enhanced identifiers, and on supply chain tracing technology. Comments must be received on or before December 1, 2026.

Proclamation 11052 applies to goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern time on December 4, 2026. It sets minimum import prices of $21 per kilogram for polysilicon, $100 per kilogram for polysilicon ingots and wafers, $0.22 per watt for solar cells and $0.38 per watt for solar modules, plus a 15 percent ad valorem duty on polysilicon ingots and derivatives, with exceptions for certain trading partners named in the proclamation.

The same drone proclamation carries a delayed second list. Its Annex III components take effect for goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern time on February 9, 2027.