AD/CVD Duty Lookup: Check Antidumping & Countervailing Duties Before You Order

Updated October 2026. Every figure below is recomputed from our structured extract of Federal Register antidumping and countervailing notices; sources are cited inline.

A buyer who checks the base HTS rate, adds Section 301, and calls the number final has still missed the layer that actually bankrupts margins: antidumping and countervailing duties, known together as AD/CVD. These are case-specific orders against particular products from particular countries, and they move on a different clock than the tariff schedule. In the roughly ninety days covered by our October 2026 extract, Federal Register notices added or revised 211 separate trade-remedy actions. One of them put a 90.8% cash deposit on Vietnamese welded stainless steel pressure pipe effective October 13, 2026 — two days after this page was finalized. This is the speed importers need to plan around.

1. What AD/CVD duties are — and why they behave differently

Antidumping (AD) duties offset goods sold in the US below their home-market fair value; countervailing (CVD) duties offset subsidies paid by a foreign government. Both are adjudicated per product and per country, not written into chapters 1–97 of the Harmonized Tariff Schedule. A supplier quote built on the base schedule can therefore be accurate in January and obsolete in October without the tariff schedule itself changing.

The mechanics differ from ordinary duties in three ways that matter commercially. First, the respondent pool is narrow: an order against “welded stainless steel pressure pipe from Vietnam” reaches only that product-origin combination, so exposure research must always pair an HS heading with an origin. Second, rates are company-specific in principle — exporters that cooperate get firm-specific rates, everyone else gets an “all others” rate that can be dramatically higher. Third, the amounts are collected as cash deposits at entry and trued up later, which means the invoice you pay at import is not necessarily the final bill. Our chapter-level map of US trade remedy actions by HS chapter covers the schedule-wide Chapter 99 layer; this guide is about the case layer beneath it.

2. The October 2026 snapshot in numbers

We maintain a structured pipeline over Federal Register documents mentioning antidumping or countervailing activity, deduplicated down to attributable case actions. The October 2026 edition holds 211 actions dated on or after July 13, 2026:

[1] Source: data/report-october-2026-stats.json (i6_adcv.rows, i6_adcv.programs, i6_adcv.stages, i6_adcv.n_countries, i6_adcv.country_counts_top12, i6_adcv.china_share_pct), generated 2026-10-11T03:47:03Z from data/adcv_cases.json.

The concentration is the story. Twelve origins account for 177 of the 211 actions — 83.9% by our own division of i6_adcv.top12_sum by i6_adcv.rows — and China alone accounts for more than the next four origins combined. If you source from China, Korea, India, Türkiye or Vietnam, AD/CVD screening is not an edge case for your business; it is a weekly probability. We keep per-origin breakdowns such as China AD/CVD actions current precisely because buyers rarely know which of their SKUs sit inside an active scope.

3. How big the rates got: median 37.53%, maximum 541.75%

Only 51 of the 211 actions — 24.2% — announce a single unambiguous percentage in their notice text, because review-type notices often list dozens of company-specific rates or defer arithmetic until later stages. Among those 51 rated measures, the median is 37.53% and the maximum is 541.75%. For scale, the entire dutiable base schedule has a median ad valorem rate of 6.4%. An AD/CVD order is thus not a surcharge; it routinely dwarfs everything else on the duty line combined.

Sources: data/report-october-2026-stats.json (i6_adcv.top_rated) cross-checked against the underlying records in data/adcv_cases.json (FR docs 2026-15473 eff. 2026-07-31; 2026-20383 eff. 2026-10-05; 2026-14470 eff. 2026-07-17).

Among the rated measures, 25 carry the margin basis and 26 carry cash_deposit, reflecting the two moments where a percentage becomes binding: the end of a review period and the start of a new deposit obligation.

4. Timing traps: the lifecycle that catches importers out

An AD/CVD obligation is not a number; it is a sequence. A case opens with a petition, moves through preliminary determinations, lands in final orders, and then lives indefinitely through annual administrative reviews — each stage resetting the operative rate. In our October extract, 75 actions are preliminary results and another 84 are final results, meaning well over half of the recent activity is actively re-pricing existing exposure rather than creating new orders. Three consequences follow for anyone buying across borders:

• The rate can change between booking and entry. Effective dates in the extract run from April 18 through October 13, 2026, clustering in late summer: 52 actions take effect in July, 58 in August, 64 in September, and 30 in the first half of October.
• Retroactivity exists. Under critical-circumstances findings, preliminary duties can reach entries up to 90 days before publication, so cargo already at sea can be billed on arrival.
• Deposits are reconciled later. A cash deposit is an estimate; the final liquidation can demand more, with interest. Sellers who priced a contract on the deposit rate treat the true-up as a surprise.

The live example as we finalize this piece: the preliminary antidumping result on welded stainless steel pressure pipe from Vietnam sets a 90.8% cash deposit effective October 13, 2026 (Federal Register document 2026-20816, case A-552-816). Any importer with Vietnamese pipe in transit this week faces that number at entry, not the 0–5% range the base schedule suggests for stainless tube.

5. Five steps to check AD/CVD exposure before confirming an order

1. Nail the ten-digit classification. Scope rulings turn on precise descriptions; a sibling statistical suffix can fall outside the order entirely. If the classification itself is unclear, resolve it first with our guide on how to find your HS code.
2. Pair the product with the true country of origin. Transshipment does not launder AD/CVD exposure — orders follow the country of manufacture, and enforcement against circumvention through third countries keeps tightening.
3. Search active orders for that product-origin pair. Scan our per-origin dashboards (AD/CVD action index) or the official Commerce and ITC databases; record the case number, not just the product name.
4. Confirm the operative stage and rate. Read the most recent Federal Register notice for the case: a preliminary-result rate is provisional, a final-order rate governs ongoing entries, and amended orders supersede both. Note the effective-date language verbatim.
5. Add the layers and stress-test the price. Total duty = base HTS rate + applicable Chapter 99 add-ons + AD/CVD deposits. If the stack crosses 50%, renegotiate or re-quote before shipping — see our worked example of stacking turning 5.7% into 105.7% total duty for the same arithmetic applied to the Chapter 99 layer.

Frequently asked questions

What is the difference between antidumping duties and countervailing duties?

Antidumping (AD) duties offset products sold to the US below fair value; countervailing (CVD) duties offset foreign government subsidies. Both are assessed case by case against a specific product from a specific country, and many product-country combinations carry both programs at once.

How do I find out whether my product carries AD/CVD before ordering?

Search the product description and country of origin in the Department of Commerce and International Trade Commission case databases, then confirm the current cash-deposit rate in the Federal Register notice for the most recent review stage. Our own country pages collect currently active measures so you can scan your origin country in seconds.

Do antidumping and countervailing duties stack on top of normal tariffs?

Yes. AD/CVD deposits are assessed on top of the base HTS general rate and on top of any Chapter 99 additional duties that apply. Your total duty bill is the sum of all applicable layers, which is why a product with a 5% base rate can face a triple-digit percentage total.

What is a cash deposit rate in an antidumping case?

A cash deposit is the provisional payment an importer posts at entry while the case continues. Preliminary and final results of administrative reviews set new deposit percentages. If the final determination finds less dumping was occurring, part of the deposit is refunded; if it finds more, the importer owes the difference plus interest.

Can AD/CVD duties apply retroactively to shipments already en route?

In new investigations yes: when the preliminary determination includes a critical-circumstances finding, duties can reach entries made up to 90 days before the notice publishes. Goods loaded before the announcement can still be billed after arrival, so contract terms should allocate this risk explicitly.

Which countries face the most US AD/CVD actions right now?

China dominates by a wide margin: 75 of the 211 actions in our October 2026 extract, about 35.5%, name China as the origin. South Korea follows with 25 actions, India with 21, Türkiye with 11 and Vietnam with 8.

Sources and methodology

Case layer: our structured extract of Federal Register documents mentioning antidumping or countervailing activity, window starting 2026-07-13, retrieved 2026-10-11 via the Federal Register API and stored as data/adcv_cases.json (211 attributable actions; schema adcv_cases/v0). Rates are recorded only where a single unambiguous percentage appears near margin or deposit language — 51 of 211 rows — which is why aggregate statistics in this article distinguish rated from unrated measures. Review-type notices may omit HTS subheadings entirely, so only 12 of 211 rows carry machine-readable HS references; we state that limitation rather than impute classifications. Statistics referenced throughout come from data/report-october-2026-stats.json key i6_adcv. Base-schedule context (median 6.4%) comes from the USITC export behind data/hts.json as summarized in the same stats file under context_hts_base. Nothing in this article relies on projected or unpublished datasets.

This page covers the case-level AD/CVD layer. For the schedule-wide Chapter 99 additional-duty layer, see the chapter-level trade remedy map; for Section 301 exposure specifically, see our Section 301 explainer.