Most product-based businesses are quietly bleeding money at the border.

They are duty overpayments – taxes that were paid but should never have been charged in the first place. The worst part is that most importers aren’t even aware they are owed a refund. With proper handling of an illegal tariff refund your business can:

• Recover years of overpaid duties
• Free up cash tied up with the government
• Earn interest on every wrongly collected dollar

And the best part? The legal framework already exists to get that money back.

Here is what every importer needs to know…

What’s inside this guide:

1. What Counts As A Customs Overpayment?
2. Why Product-Based Businesses Overpay So Often
3. The Numbers Behind Unlawful Tariff Refund Claims
4. How To Spot An Overpayment Before The Deadline Hits

What Counts As A Customs Overpayment?

Customs overpayment refers to any duty paid in excess to U.S. Customs and Border Protection.

That can mean many things. Sometimes a product code was classified incorrectly. Sometimes the wrong duty rate was applied. And sometimes … like lately … it’s an illegal tariff that gets imposed, and later invalidated by the judiciary.

Reviewing previous entries carefully will allow you to pinpoint exactly where the money was lost – from the HS code selected all the way down to country of origin and preferential trade program, if any, that should have been used.

Spotting these overpayments helps your business in three big ways:

• Retrieve cash already paid: When faced with a customs audit, most importers discover they’ve paid duties they shouldn’t have. That money should be in your business.
• Spot repeat classification errors: Thousands of dollars riding on one misclassified product per shipment. Once corrected, the problem no longer bleeds.
• Benefit from court decisions: When tariffs have been deemed illegal, importers who paid them may qualify for a tariff refund provided they take action within strict time limits.

Pretty important, right?

Here’s why overpayments occur so frequently, as well as the most recent statistics.

Why Product-Based Businesses Overpay So Often

If you import goods regularly, the odds of overpaying are surprisingly high.

Consultants have estimated that between 5-15% of duty lines have overpayments. That’s a significant percentage of your goods-for-sale revenue.

The reasons are pretty consistent:

1. Tariff codes get misclassified
2. Country of origin is recorded incorrectly
3. Preferential trade programs are missed
4. Emergency tariffs get paid that later get invalidated

It really is that common.

How come? Customs laws are complex, constantly evolving, and most companies are concerned with moving product through the door NOT auditing duty calculations.

Forgoing those overpayments leaves money with the government that should be in your bank account.

The Numbers Behind Unlawful Tariff Refund Claims

First of all, it helps to understand the magnitude of the problem. With the recent Supreme Court decision regarding emergency tariffs, customs overpayments are back in the spotlight.

The latest figures are eye-opening…

CBP released numbers indicating there were over 330,000 importers paid roughly $166 billion in duties on more than 53 million shipments. This is the amount collected since implementation through when the Supreme Court ruled the tariffs illegal.

Meanwhile, costs are beginning to add up. By waiting to refund companies for emergency tariffs, U.S. importers are paying $700 million in interest per month.

That is a lot of money on the table.

Who Is Eligible

Not all companies that paid these tariffs will automatically receive refunds. Enrollment in the first phase of the refund program is limited…

Only when tariffs were projected but not firm or within 80 days of final billing. Otherwise, a separate protest must be pursued.

How Much Money Is Realistic

Recoveries differ greatly between businesses. Ranging from $10k to over $1 million.

Even the lower end is meaningful for most product-based businesses.

Why Speed Matters

The biggest problem is that importers delay too long. Customs provides strict statutory timelines to file protests/refund claims. If the deadline is missed, the funds are lost forever.

That’s why businesses that move fast are the ones that recover the most.

How To Spot An Overpayment Before The Deadline Hits

Now for the good stuff. Identifying a customs overpayment is easier than expected – you just have to know where to look.

Pull Your Entry Records

The initial task is to pull every entry summary filed within the past 18 months. These are:

• All CBP Form 7501 entries
• Duty payments by HTS code
• Country of origin declarations
• Any IEEPA-related tariff payments

Nothing can be seen without these. Many customs brokers can export this information as CSV if it isn’t already on hand.

Review Your Classification Codes

The Harmonised Tariff Schedule contains thousands of codes, and minor variations equate to massive duty swings. Beware of:

• Products with multiple possible classifications
• Codes that haven’t been reviewed in years
• Items where similar products use different codes

One miscategorized code can translate into big bucks back — particularly if that product has been brought in for years.

Identify Unlawful Tariff Payments

Enter the recent Supreme Court decision. If goods were imported from February 2025-Feb 2026, IEEPA tariffs were likely paid that have since been found to be illegal.

Companies may be owed as much as $165 billion in refunds, the Penn Wharton Budget Model says. Some of that could be yours.

File Within The Deadlines

After overpayments are identified, time is of the essence. There is a 180 day protest period from liquidation and the CAPE refund website has specific timelines to file. Prepare the documents and file promptly.

Closing Thoughts

Customs overpayments are one of the least appreciated sources of free cash flow for product-based businesses. They occur frequently and most importers are unaware they are owed.

The good news? Recovering that money can save you:

• Time — by avoiding ongoing classification errors that compound year after year.
• Cash — through refunds (plus interest) of duties that should not have been paid.
• Risk — by ensuring your import compliance is clean going forward.

To quickly recap:

• Pull every entry summary from the last 18 months
• Review tariff codes for classification errors
• Identify any IEEPA tariff payments
• File protests and CAPE claims before the deadlines
• Reinvest the refunds back into your business

A recent Supreme Court decision has opened up a once-in-a-generation opportunity for importers to recoup improperly assessed duties. When considered together with the daily overpayments occurring due to misclassification, there are BIG dollars available.

The businesses that act now are the ones that win.