Section 301 Tariff Refunds and the First Sale Rule: How Your Declared Value Caps Your Recovery

Most importers filing for a Section 301 tariff refund focus on one number: the duty they paid. But the duty amount was never a fixed fact. It was calculated from a value you chose to declare at entry, and that value determines the ceiling on every refund you can recover. The First Sale Rule is the mechanism that sets that ceiling, and it is one of the least examined variables in the entire tariff overpayment recovery process.

If you imported from China during any period when Section 301 duties applied, and you are now preparing an IEEPA tariff refund claim or reviewing your Section 301 exposure, understanding how customs value was established is not optional. It is the difference between recovering what you actually paid and recovering less because you left money on the table years earlier.

What the First Sale Rule Actually Says

Under U.S. customs law, the dutiable value of imported merchandise is generally the price actually paid or payable for the goods when sold for exportation to the United States. That sounds simple. The complication is that in a typical supply chain, there are often two sales: one between the foreign factory and a middleman or trading company, and another between that middleman and the U.S. importer.

The First Sale Rule allows an importer to use the earlier of those two sales, the factory-to-middleman transaction, as the basis for customs value, provided certain conditions are met. That earlier price is almost always lower. A lower declared value means lower ad valorem duty, including Section 301 duties that are assessed as a percentage of value.

CBP has long accepted the First Sale Rule, and the Court of International Trade has upheld it repeatedly. But using it requires documentation that most importers do not maintain, and it requires that the sale be a bona fide sale for exportation to the United States, negotiated at arm's length, with the goods clearly destined for the U.S. market at the time of the first sale.

Why This Matters for Section 301 Refund Recovery

Section 301 duties are calculated as a percentage of the entered value. List 1 goods carried a 25 percent duty. List 3 goods carried 25 percent. List 4A carried 7.5 percent. These rates applied to whatever value you declared on your entry summary.

If you declared the middleman's price rather than the factory price, your entered value was higher than it needed to be. Your Section 301 duties were higher than they needed to be. And if you are now trying to recover those duties because the underlying tariff authority was struck down, your refund is calculated on the amount you actually paid, not on the amount you could have paid.

This is a fundamental point that many importers miss. A tariff refund claim, whether filed through the CAPE portal for IEEPA tariffs or pursued through a post-summary correction for Section 301, recovers what was paid. It does not retroactively correct an overvaluation at entry unless you file a separate claim or protest to fix the value itself.

The Two Tracks: Refund Claims and Value Corrections

There are two distinct tracks an importer can pursue, and they have different deadlines, different legal standards, and different documentation requirements.

• Track 1: Tariff refund claims. If the duty was unlawful or the tariff authority was invalidated, you claim back the duty you paid. The calculation uses the value already on file with CBP. This is the track most importers are on right now, especially with the IEEPA tariff refund window open through February 4, 2027 for fentanyl tariffs and April 5, 2027 for reciprocal tariffs.
• Track 2: Value corrections. If your declared value was wrong because you failed to apply the First Sale Rule, you can file a post-summary correction under 19 U.S.C. 1514 or a protest to correct the value. This can reduce the duty owed and, in some cases, generate a refund of the overpayment. But these claims have their own strict deadlines, generally 180 days for a PSC and 180 days from liquidation for a protest.

The two tracks can overlap. If you paid Section 301 duties on an overstated value, and you later establish that the First Sale Rule should have applied, you may be able to recover both the excess duty from the overvaluation and any refundable duty from the tariff itself. But the documentation burden is significant, and the deadlines do not wait.

Documentation the First Sale Rule Requires

CBP does not accept a bare assertion that a lower price existed. You need evidence that establishes the first sale was a bona fide, arm's length transaction for export to the United States. In practice, that means assembling a documentation file that can survive audit.

• The factory invoice showing the sale from the manufacturer to the middleman or trading company, with a price that is clearly lower than the price on the middleman's invoice to you.
• Proof that the goods were destined for the United States at the time of the first sale. This can include purchase orders, shipping instructions, or correspondence showing U.S. destination from the outset.
• Evidence that the transaction was at arm's length, meaning the parties are not related in a way that distorts pricing. If they are related, additional transfer pricing documentation may be required.
• A clear paper trail connecting the first sale to the entry, including the commercial invoice, packing list, bill of lading, and entry summary. The goods on the first sale invoice must be the same goods entered.

Without this documentation, the First Sale Rule is not available. CBP will use the later sale, and your value stands as declared.

The Strategic Question for Importers with Open Refund Claims

If you have entries that are eligible for an IEEPA tariff refund, and those same entries were valued using the middleman's price rather than the factory price, you need to decide whether to pursue a value correction alongside the refund claim. The refund claim alone will return the duty paid on the higher value. A value correction, if successful, could increase that recovery by reducing the base on which the duty was calculated.

But the value correction is not automatic. It requires documentation you may not have, and it requires filing within deadlines that may already be approaching or past. For entries that liquidated years ago, the protest window may be closed. For entries that are still within the PSC window, there may be time, but the clock is running.

CBP has processed approximately $121.75 billion in IEEPA-related claims, and roughly 93.5 percent of eligible importers have not yet filed. That stat suggests that many companies are still deciding what to do, and some of them are sitting on value correction opportunities they have not identified.

What to Do Next

Start by pulling your entry data from the ACE portal for the periods when Section 301 duties applied to your Chinese-origin goods. Look at the entered value on each entry summary and compare it to the commercial invoice from your vendor. If there is a gap between what you paid the factory and what you declared to CBP, you may have a First Sale Rule opportunity.

Then determine which deadlines apply. IEEPA refund claims have a defined window. Section 301 value corrections have their own deadlines tied to liquidation. The two are not the same, and missing one does not extend the other.

Tarisol connects importers with licensed customs specialists who file IEEPA tariff refund claims through CBP's CAPE portal on a success-based fee model, with no upfront cost. If you are unsure whether your declared values were correct, or whether you have a value correction claim alongside your refund claim, checking eligibility is the first step. It costs nothing to find out what you may be owed.