An entry for a dutiable import now commonly carries two classifications for the same goods. The first, from Chapters 1 to 97 of the HTSUS, describes the product. The second, from Chapter 99, carries the trade action: a Section 301 list, a Section 232 measure, an exclusion, reported as an additional subheading on the entry summary line. CBP assesses the additional duty from that second line. Get the product classification right and the Chapter 99 line wrong, missing, or paired with an exclusion that has expired, and the entry is wrong in the part that usually costs the most money.
How the two line reporting works
On the CBP Form 7501 entry summary, the Chapter 99 number is reported in addition to the primary classification, not instead of it, and the value and quantity reporting follows CBP's guidance for the specific action, which is not identical across programmes. Some actions require a second quantity in a specified unit, others key the additional rate to the customs value of the line, and steel and aluminium measures turn on content reporting that has changed more than once. The broker's software will prompt for what the action requires only if the filer has identified the action correctly in the first place. Software cannot rescue a line where nobody asked whether a Chapter 99 number belonged.
Exclusions are dated instruments
A Section 301 exclusion is not a property of a product. It is a grant, published in the Federal Register, with a product description, an effective window, and, for many, an expiry that has been extended unevenly across lists. Reporting the Chapter 99 line for an exclusion outside its window, or for a product that sits outside the exclusion's specific description while sharing its ten digit code with products inside it, creates the classic bad entry: duty underpaid at entry, discovered at audit or liquidation, collected with interest. Keep the exclusion citation, Federal Register volume and page, description, and dates, in the entry packet per product, refreshed whenever USTR publishes an extension notice.
Stacking order on a single line
Where more than one action applies, a line can carry a base MFN rate, a Section 301 additional rate, and a Section 232 measure, with antidumping or countervailing deposits assessed under their own case numbers on top. Each element is reported and calculated in its own way, and the total effective rate is the stack, never a single published number. Importers budgeting from a headline rate for their code are budgeting from fiction. The entry summary, read line by line, is the only document that states what was actually assessed, which is why landed cost reviews should start from entry data rather than from a tariff table on a website.
Reconcile Chapter 99 reporting monthly
Run a monthly reconciliation between the product master, the list of codes the company believes are subject to each action, and what was actually reported on entries in the month. Look for the three recurring failures: subject product entered with no Chapter 99 line, non subject product carrying one, and an exclusion line used past expiry. All three are cheaper as a post summary correction before liquidation than as a CBP collection afterwards. Confirm the treatment with a licensed customs broker before filing corrections, and keep the reconciliation itself. In a reasonable care review, a dated reconciliation log is evidence the importer was paying attention.
Keep reading
Related guides on this site: Section 301 Exclusions: How the Request Process Works and Why Most Fail Foreign Trade Zone Basics: What Admission Does and Does Not Do to Duty Answers for teams shipping Shopify orders across borders.
Frequently asked questions
What is a Chapter 99 subheading?
An HTSUS Chapter 99 number used to report additional duties, exclusions, and special measures, such as Section 301 and Section 232 actions, alongside the primary Chapters 1 to 97 classification on an entry.
Does an exclusion remove the need to report Chapter 99?
No. Excluded products are generally reported with the specific Chapter 99 subheading for the exclusion, within its effective dates and product description, so CBP can apply the excluded rate.
How are multiple tariff actions handled on one product?
They stack. The base rate and each applicable additional action are reported and calculated separately on the entry, and the total duty is the sum of the applicable elements.