Antidumping and countervailing duties (AD/CVD) are the most financially dangerous corner of U.S. customs law, and also the most misunderstood. An importer can budget carefully for ordinary tariffs, clear a shipment cleanly, and still get hit years later with a duty bill several times the value of the goods. The rules do not work the way most importers assume, and the assumptions are what get people hurt. Here are ten facts every importer dealing in AD/CVD-sensitive products should understand.
For the full picture of how these duties and scope rulings work, see our practice page on antidumping and countervailing duties. This article is the quick orientation to what surprises importers most.
1. AD and CVD Solve Two Different Problems
Though they travel together, antidumping and countervailing duties address two distinct unfair-trade practices. Antidumping duties respond to “dumping” — a foreign producer selling goods in the U.S. below fair value or below the price it charges at home. Countervailing duties offset subsidies a foreign government provides to its producers. Both are meant to level a playing field distorted by conduct abroad, and a single product can be subject to both at once.
| Antidumping (AD) | Countervailing (CVD) | |
|---|---|---|
| Targets | Goods sold below fair value | Goods benefiting from foreign subsidies |
| Who’s at fault | The foreign producer’s pricing | The foreign government’s support |
| Set by | Dept. of Commerce (rate) + ITC (injury) | Dept. of Commerce (rate) + ITC (injury) |
2. The Duties Can Be Enormous
Ordinary tariffs are measured in single or low double digits. AD/CVD rates routinely run to 50%, 100%, or several hundred percent, because they are calibrated to offset the unfair pricing or subsidy — not to raise revenue. It is entirely possible for the duty on a shipment to exceed what the goods themselves are worth. That magnitude is why AD/CVD exposure can turn a routine import into a business-ending liability, and why it deserves attention before you place an order, not after the entry.
3. They Stack on Top of Every Other Duty
AD/CVD is not an alternative to other duties — it is an additional layer on top of them. A covered product still owes its ordinary duty rate, and it still owes any Section 301 China tariff or Section 232 steel or aluminum duty that applies, with the antidumping and countervailing duties added on top of all of it. Importers who mentally substitute one for another badly underestimate the total. The layers accumulate, and AD/CVD is usually the largest of them.
4. You Owe Them Even If You Didn’t Know
This is the fact that catches honest importers hardest. AD/CVD liability attaches to the product based on whether it falls within the scope of an order — not on whether you knew an order existed. As the importer of record, you are responsible for the duties regardless of your knowledge or intent. A supplier who assures you the goods are “duty-free” does not shift that liability, and neither does a genuine misunderstanding about what your product is. If it is covered, you owe.
5. The Rate at Entry Is Not the Final Bill
The United States uses a retrospective assessment system, and this trips up importers who assume the amount they pay at entry is settled. At entry you post estimated cash deposits at the rate then in effect. But the final duty is determined later — often through an administrative review, sometimes years after import — and it can be higher than what you deposited. If the reviewed rate goes up, you owe the difference on entries you thought were long closed.
Your AD/CVD liability can grow after the goods are sold
Because the deposit at entry is only an estimate, an importer can sell through the inventory, book the profit, and then face a supplemental duty bill when the final rate is assessed at a higher level. Planning for AD/CVD means budgeting for the possibility that the real cost lands later — and larger — than the entry suggested.
6. The Rate Depends on the Specific Producer
AD/CVD rates are not one number per country. Commerce assigns rates to individual producers and exporters, and there is usually a separate “all-others” rate for everyone not individually examined. Two factories in the same country can carry very different rates — which means who you buy from, not just what and where, can dramatically change your duty. Sourcing from a producer with a low assigned rate, and correctly documenting that the goods are actually theirs, is a legitimate and important part of managing AD/CVD cost.
7. Whether You’re Covered Is a “Scope” Question
AD/CVD orders apply to specific products described in the order’s scope language, and the single most important question for any importer is whether a given product falls inside or outside that language. The answer is not always obvious — scope descriptions can be technical, and small product differences can matter. When coverage is genuinely unclear, an importer can request a scope ruling from Commerce to get a determination, rather than guessing and hoping. Our page on AD/CVD duties and scope rulings covers how that process works, and a binding ruling can resolve related classification questions.
8. Routing Around an Order Is Evasion — With Teeth
Because the duties are so steep, some suppliers try to disguise covered goods — most commonly by transshipping Chinese-origin products through a third country and relabeling the origin. That is evasion, and CBP enforces against it aggressively under the Enforce and Protect Act, with investigations that can impose interim measures and retroactive duties before any final finding. Crucially, an importer can be caught in an evasion case even when a supplier transshipped without telling them. Our article on antidumping circumvention and transshipment explains how CBP detects it and what the exposure looks like.
9. Orders Can Last for Decades
An AD/CVD order is not a temporary measure that quietly expires. Orders are subject to “sunset” reviews roughly every five years, but they continue in force unless they are affirmatively revoked — and many have stayed in place for decades. Importers who assume an inconvenient order will lapse if they wait it out are usually wrong. If your product is covered, plan on that being the long-term reality rather than a passing condition.
10. Orders and Rates Change Constantly
Longevity does not mean stability. New orders are issued, existing rates change at annual administrative reviews, and scope is refined over time. A product that was clear of any order last year may be covered this year, and a rate you relied on may have moved. Treating AD/CVD status as a one-time check is a mistake — it is a moving target that has to be re-verified before each sourcing decision. Building that verification into your import compliance process is the difference between managing the risk and being ambushed by it.
The Common Thread
Every one of these facts points the same direction: AD/CVD risk is larger, longer-lasting, and less forgiving than importers expect, and it lands on the importer of record regardless of fault. The importers who manage it well confirm scope before they buy, budget for retrospective liability, vet their suppliers’ true origin and assigned rate, and re-check status as orders evolve. When the exposure is real — a close scope question, an unexpected duty bill, or an evasion allegation — a customs and international trade lawyer can assess coverage, respond to CBP, and protect against the outcomes that make AD/CVD so costly.
Frequently Asked Questions
What is the difference between antidumping and countervailing duties?
Antidumping duties address foreign goods sold in the U.S. below fair value, while countervailing duties offset subsidies a foreign government gives its producers. Both are set by the Department of Commerce with an injury determination by the ITC, and a product can be subject to both at once.
Am I liable for AD/CVD if I didn’t know my product was covered?
Generally yes. Liability turns on whether the product falls within the scope of an order, not on your knowledge. As the importer of record, you are responsible for the duties even if a supplier told you the goods were duty-free or you did not know an order existed.
Can my AD/CVD bill go up after I import?
Yes. The U.S. uses a retrospective system: you post estimated cash deposits at entry, but the final duty is assessed later, often at administrative review. If the reviewed rate is higher, you owe the difference — sometimes years after the goods were imported and sold.
Does AD/CVD replace regular tariffs, or add to them?
It adds to them. A covered product still owes its ordinary duty plus any Section 301 or Section 232 tariff that applies, with antidumping and countervailing duties stacked on top. The layers accumulate, and AD/CVD is usually the largest.
Facing an AD/CVD question or duty bill?
Scope disputes, retrospective assessments, and evasion allegations all land on the importer. A customs attorney can assess coverage and protect your exposure.