Right as Q4 inventory shipments start hitting the water, U.S. Customs and Border Protection quietly flipped a switch that could strand your holiday stock at the port. Starting September 18, 2026, CBP began immediately voiding Importer of Record (IOR) numbers tied to incomplete or inaccurate Form 5106 data, with no warning period and no grace window. If your IOR number gets voided while a container is mid transit, it cannot clear customs until the problem is fixed. For sellers who just placed their biggest orders of the year, that is not a paperwork inconvenience. That is a blown Black Friday.
What actually changed on September 18
CBP Form 5106 is the form that registers your business as an Importer of Record, the legal entity responsible for a shipment entering the United States. It has existed for years, but enforcement was loose. Sellers routinely listed a customs broker’s address, a freight forwarder’s contact info, or an outdated registered agent as their own, and CBP mostly let it slide.
That changed with a Federal Register notice published August 19, 2026, which took effect September 18. CBP is now cross checking every IOR record against a stricter accuracy standard, and when it finds a mismatch, it does not send a warning first. It voids the number, then emails a notice explaining why. A voided IOR number is dead for every future entry until you fix the record and get it reinstated, and CBP has been explicit that this applies to existing importers, not just new registrations.
The legal teeth behind this are real. CBP’s notice points to potential liability under 18 U.S.C. 1001 for false statements, exposure under the False Claims Act, and customs broker penalties under 19 U.S.C. 1641 if a broker knowingly submitted inaccurate data on a client’s behalf.
The address and contact rules that trip up most FBA sellers
Here is where a lot of Amazon sellers are going to get caught, often without realizing it until a shipment is already stuck.
- No P.O. boxes, registered agents, or broker addresses. The physical address on your IOR record has to be your actual business location. A registered agent address used purely for LLC formation, or your freight forwarder’s warehouse address used as a shortcut, no longer qualifies.
- A home address is fine, but it has to be real. If you run your business from home, that is an acceptable IOR address as long as it is where you actually operate.
- Email and phone must belong to you, not your broker. CBP has specifically called out the common practice of customs brokers putting their own contact information on a client’s Form 5106 for convenience. That is no longer allowed, and brokers are now required to exercise due diligence on this.
- Nonresident importers and DDP arrangements are highest risk. If you are a foreign seller shipping delivered duty paid, or you import through a third party logistics setup where the paperwork was filled out years ago and never revisited, your record is a prime candidate for a mismatch.
Why this is worse in September than any other month
Timing is what makes this genuinely urgent rather than just another compliance item. Most FBA sellers front load inventory in September and early October to have stock landed and prepped before Q4 demand hits. That means a lot of containers are on the water or about to be booked right now, using IOR numbers that may not have been touched since the business was first set up.
The failure mode CBP itself has flagged is the worst kind: an importer often does not discover their number has been voided until a shipment is already moving through the supply chain. You do not find out at the calm moment of filing paperwork. You find out when a container is sitting at the port, demurrage and detention fees are accruing daily, and your Q4 sell through window is shrinking by the hour.
What to check before your next shipment moves
This is not a job you can fully outsource and forget. Even with a good broker, the IOR record is your legal responsibility.
- Pull your current Form 5106 record and compare it line by line against your actual business name, tax ID, physical address, mailing address, email, and phone number.
- Confirm the physical address is not a P.O. box, registered agent, broker office, or freight forwarder facility.
- Confirm the email and phone number on file are ones you personally monitor, not your customs broker’s.
- If you use multiple customs brokers or have changed brokers in the past two years, check that none of them left their own contact details behind on an old submission.
- If anything is wrong, get it corrected with your broker now, before your next entry is filed, not after.
- Keep a dated copy of the corrected record and any CBP confirmation in case you need to prove the timeline later.
If your number does get voided, CBP has said it will email the reason to the address on file, which is exactly why having an email you actually check matters so much here. Reinstatement runs through IORProgram@cbp.dhs.gov with supporting documentation, but that process takes time you do not have when a container is already stacked at a terminal.
Frequently asked questions
Does this apply to me if I only sell through Amazon FBA and never touch customs paperwork myself?
Yes. Even if your freight forwarder or customs broker handles the filing, the Importer of Record is a legal designation tied to your business, not your service providers. If your business is the IOR, the accuracy requirement and the risk of a voided number both fall on you.
What happens to my shipment if my IOR number gets voided mid transit?
The entry cannot clear customs under that number. Depending on the port and carrier, the cargo can be held at the terminal while you correct the Form 5106 and go through reinstatement with CBP, which means accruing storage and demurrage costs on top of the delay itself.
Can I use my customs broker’s address to keep things simple?
No. CBP has explicitly said the physical address, email, and phone on the IOR record must belong directly to the importer, not the broker. Brokers are also now required to exercise due diligence rather than defaulting to their own contact information.
How do I know if my IOR number has already been voided?
CBP sends written notice to the email address on file explaining the reason. This is another reason to confirm that email is one you actually monitor. If you are unsure, ask your customs broker to check your IOR status proactively rather than waiting to find out at the port.
If you are staring down a Q4 inventory push and want a second set of eyes on your import setup, advertising strategy, or overall Amazon growth plan, Depu works with FBA sellers as a freelance consultant and is happy to help.
Sources:
Federal Register: Accuracy of Importer of Record Data Submitted to CBP
FreightWaves: CBP importer crackdown puts thousands of cross-border freight shipments at risk
EcomCrew: CBP Form 5106 Enforcement Begins September 18