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What changed at U.S. Customs?
Every message from the CBP Cargo Systems Messaging Service (CSMS), with a plain-English summary and Allied CHB's position. We add new messages every hour.
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CBP reminded ACE Portal owners how to reactivate user access
CBP reminded Automated Commercial Environment (ACE) Portal Trade Account Owners that they can reactivate Proxy Trade Account Owners and Trade Account Users themselves. The message listed the steps: log in as the account owner, use the Tools tab, select the user, and click Reactivate. It pointed to a CBP reference guide for more detail.
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This message describes a standard ACE Portal feature rather than a new rule, so it likely still applies today. It concerns account administration, not entry filing, so it does not change how we file entries for clients. Clients who manage their own ACE Portal accounts can follow these steps directly; others do not need to act.
CBP updates ACE CATAIR PGA message set with new data codes
CBP announced an update to the ACE CATAIR PGA Message Set on May 1, 2026. The update added two new qualifier codes, LAT and LON, to the PG60 record valid for the parent PG19 record. It also added a new inspection or lab testing status code, N, to the PG30 record.
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This is a technical update to the data set used for filing partner government agency information in ACE. It concerns the systems and data formats brokers use, not actions importers or shippers need to take. Later CSMS messages may have changed related PGA requirements, and clients with questions about how this affects their specific entries should ask Allied to review them.
ACE truck manifest and references tab were briefly unavailable in April 2026
CBP announced that the ACE Truck Manifest and References Tab applications, including ACE Reports, were unavailable in the ACE Mod Portal. CBP said EDI processing was not affected and all other ACE applications remained available. CBP said it would issue another message once the issue was resolved.
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This outage affected only certain ACE Mod Portal applications and did not affect EDI filings we submit for clients. CBP indicated a follow-up message would confirm when service was restored, and a later CSMS may have already done so. Clients do not need to take any action regarding this notice.
CBP resolved earlier ACE Truck Manifest and References Tab outage
CBP announced that the ACE Portal Truck Manifest and References Tab applications, along with ACE Reports in the ACE Mod Portal, were unavailable and have since been restored. CBP advised users to clear their browser cache to regain access. The notice affected users of these specific ACE Mod Portal applications.
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This was a temporary ACE Mod Portal access issue that CBP resolved shortly after it arose. It did not change any filing rules or entry requirements, and later CSMS messages have not referenced it further. Clients do not need to take any action regarding this notice.
CBP held ACE maintenance overnight May 2 to 3, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, May 2, 2026, to 4:00 a.m. ET Sunday, May 3, 2026. This affected filers using ACE during that window. The message did not describe which specific ACE functions were unavailable.
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This was a routine, time-limited ACE maintenance window that occurred in the past and has no ongoing effect on entries we file today. Clients do not need to take any action regarding this notice now.
CBP ran ACE maintenance window on April 29, 2026 (test environment)
CBP announced an ACE certification standard invasive maintenance window scheduled for April 29, 2026, from 5:00 p.m. to 8:00 p.m. ET. This affected the ACE certification (test) environment, not the production system used for live filings.
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This notice concerns a system maintenance window that has already passed and applied to the ACE test environment. It did not affect entries Allied filed for clients. Clients do not need to take any action regarding this message.
CBP held ACE maintenance overnight April 25 to 26, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, April 25, 2026, to 4:00 a.m. ET on Sunday, April 26, 2026. This maintenance window affected ACE availability for filers during those hours. The message did not describe any specific system functions affected.
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This was a routine, time-limited maintenance window that has already passed. It does not affect entries we file today, and clients do not need to take any action regarding this notice.
CBP Held ACE Maintenance Window on April 22, 2026
CBP announced an ACE Certification Standard Invasive Maintenance Window scheduled for April 22, 2026, from 5:00 pm to 8:00 pm ET. The message gave no other details about affected systems or functions.
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This was a routine, time limited maintenance window for the ACE Certification test environment, not the production system used for filing entries. It required no action from clients and had no lasting effect on entries we file today. Clients do not need to do anything about this notice now.
CBP added new ACE error checks for Section 232 drawback claims on auto parts
CBP announced it deployed two new ACE error validations for drawback claims on April 21, 2026. The FD12 error flags 1313(a) or 1313(b) claims dated before November 1, 2025. The FD13 error flags claims that lack both the Section 232 HTS number and the Chapter 1-97 HTS number, or that claim more than is available on the entry summary line, for Medium- and Heavy-Duty Vehicle Parts and Automobile Parts from South Korea.
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This affects drawback claims we file under 19 U.S.C. 1313(a) and 1313(b) that involve Section 232 duties on these vehicle and auto parts. We report both the eligible Section 232 HTS number and the Chapter 1-97 HTS number, and confirm claim dates and amounts, to avoid these ACE errors. Clients filing drawback on these products should ask us to review their claims against these validations, since we have no information that later CSMS messages changed this.
CBP adds error code blocking PSCs on entries with pending CAPE refunds
CBP announced an updated ACE Entry Summary Error Dictionary. It added error code 864, which blocks a post-summary correction on any entry where a CAPE declaration has already been filed for an IEEPA refund. CBP published this alongside the April 20, 2026 launch of the CAPE tool in the ACE Portal.
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This confirms what CBP had already told filers: once we submit a CAPE declaration for an IEEPA refund, we cannot also file a post-summary correction on that entry. We continue to use CAPE declarations, not PSCs, for IEEPA duty refund requests. Clients do not need to take any action on this notice, but should contact us if they want us to review whether an entry needs a CAPE declaration.
CBP Added ACE Error Code Blocking PSC When a CAPE Refund Is Pending
CBP announced an updated ACE Entry Summary Error Dictionary that added a new validation error, condition code 864, which blocks a post-summary correction on an entry once a CAPE refund declaration has been filed for it. CBP tied this update to the April 20, 2026 launch of the CAPE tool in the ACE Portal. The change affects filers submitting entry summary corrections.
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We follow this rule when we amend entries for clients that have filed an IEEPA refund claim through CAPE. Once a CAPE declaration is submitted for an entry, CBP will reject any post-summary correction on that entry, so refunds must go through CAPE, not a PSC. This still applies today. Clients do not need to do anything, but should tell us if they want us to check the status of a specific entry.
CBP held ACE maintenance window in April 2026, now past
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, April 18, 2026, to 4:00 a.m. ET Sunday, April 19, 2026. This was a scheduled system outage affecting ACE availability during that window. The message did not describe any other impact.
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This was a routine, time-limited maintenance window that has already passed. It did not require any action from clients then and has no bearing on entries filed now.
CBP reminded PMS Test filers to pay supplemental duty bills electronically
CBP reminded participants in the Periodic Monthly Statement (PMS) Test that supplemental duty bills tied to entries originally paid on a monthly statement must be paid electronically. The requirement took effect December 15, 2025, and payment must be made via ACH Debit through the Pay.gov Bill Payment Form or via ACH Credit. Bills mailed by CBP since March 1, 2026 include the specific Pay.gov payment instructions. CBP said bills paid by other means may lead to suspension from monthly statement privileges.
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This message affects importers who participate in the PMS Test program and pay duties on a monthly statement. Nothing in later CBP messages we have seen changes this requirement, so it should still apply to supplemental duty bills from PMS Test entries. Clients enrolled in the PMS Test should confirm they pay supplemental bills electronically through Pay.gov or ACH Credit, and should ask us if they have questions about a specific bill.
CBP held ACE maintenance window on April 15, 2026 (historical)
CBP announced an ACE certification standard invasive maintenance window on April 15, 2026, from 5:00 p.m. to 8:00 p.m. ET. The message did not describe expected system impacts. This notice is now more than 30 days old.
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This was a routine, time-limited maintenance window in CBP's ACE test environment and had no lasting effect on entries we file. Clients did not need to take any action then and do not need to act now. If clients have questions about how this affected a specific filing at the time, they should contact us.
CBP now sends automated alerts on container seal changes in ACE
CBP reminded trade that it deployed an ACE update on April 9, 2026, that automatically notifies carriers by EDI when CBP adds or removes container seals on ocean and rail shipments. ABI filers can query D2/D3 notifications for a bill of lading to see new container and seal numbers. This affects ocean and rail carriers and ABI filers.
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This update concerns carriers and ABI filers who track container seal notifications in ACE. It does not change how we file entries for clients, and clients do not need to take any action. If clients want us to check seal change records for a specific shipment, they can ask us.
CBP held ACE maintenance window in April 2026, now past
CBP announced an ACE Production Standard invasive maintenance window from 10:00 p.m. ET on Saturday, April 11, 2026, to 4:00 a.m. ET on Sunday, April 12, 2026. This is a routine system maintenance notice with no other details provided. The window has already passed as of today.
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This was a routine ACE maintenance notice and the window has already passed. It did not require any action from importers or shippers at the time, and it has no bearing on entries filed now. Clients do not need to act on this message.
CBP added automated ACE alerts for container seal changes on ocean and rail shipments
CBP announced an updated Trade Information Notice describing new ACE features for container seal changes on ocean and rail shipments. The update added disposition codes so ACE notifies carriers by EDI when CBP personnel add or remove container seals, and let ABI filers query D2/D3 notification records for a bill of lading. CBP deployed these features to the ACE production environment on April 9, 2026.
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This update concerns ACE system notifications for carriers and ABI filers, not entry filing requirements. We use these ACE features when reviewing bill of lading records for shipments we handle, but clients do not need to take any action. Clients with questions about a specific shipment's seal status should ask us to check the ACE record.
CBP held ACE maintenance overnight April 4 to 5, 2026
CBP announced invasive maintenance to the ACE production standard system from 10:00 p.m. ET on April 4, 2026 to 4:00 a.m. ET on April 5, 2026. This was a scheduled overnight maintenance window. The message did not describe any specific system changes.
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This was a routine overnight maintenance window that has already passed. It did not require any action from clients at the time and has no ongoing effect on entries we file today. Clients do not need to do anything about this notice now.
CBP launched new web-based ACE Portal account application in April 2026
CBP announced on April 1, 2026 that it released a modernized ACE Secure Data Portal account application for companies without existing ACE Portal access. The new web forms covered new importer, exporter, protest filer and other sub-account applications, plus updates to Account Owner information. CBP said it would temporarily continue accepting the older PDF-based application during the rollout period.
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This message concerned how companies apply for ACE Portal accounts, not how we file entries, so clients did not need to act on it. Later CSMS messages may have changed the application process or web links described here. Clients setting up a new ACE Portal account should ask Allied to confirm the current application procedure before applying.
CBP enhanced ACE truck manifests to capture ATA Carnet data starting March 2026
CBP announced that on March 24, 2026 it enhanced the Automated Commercial Environment (ACE) to let trade users include ATA Carnet information in electronic truck manifest filings. CBP held a support call on March 31, 2026 to answer trade questions about the change. The message was aimed at carriers and other filers submitting truck manifests through ACE.
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This update affects truck manifest filings, not the formal, informal, mail or e-commerce entries we file for clients. We have no indication that later CSMS messages changed this ACE feature. Clients who move goods under ATA Carnets by truck and have questions about how this affects their shipments should ask us to review their specific movements.
CBP held ACE test system maintenance window on April 1, 2026
CBP announced an ACE certification standard invasive maintenance window for April 1, 2026 from 5:00 p.m. to 8:00 p.m. ET. This affected the ACE certification (test) environment. The message did not describe any effect on production filing.
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This was a routine maintenance window for CBP's ACE certification test environment, not the production system Allied uses to file entries. It has already passed and required no action from clients then or now. Clients do not need to do anything.
CBP Reminded Importers to Set Up ACH Refunds in the ACE Portal
CBP announced that since February 6, 2026, refunds are issued electronically only, following an interim rule and a related executive order. CBP reported that more than 12,300 certified refunds had been rejected because recipients had not provided valid U.S. bank account information in the ACE Portal. The message reminded importers and other refund recipients with entry summaries liquidated since that date to enroll their banking information using CBP's ACH enrollment guides and training materials.
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At the time, this meant importers who had not added bank details to the ACE Portal risked having their refunds rejected. This requirement appears to still apply, since CBP later moved to electronic refunds through ACE for other programs as well. We recommend clients confirm their ACH banking information is current in the ACE Portal and contact us if they are unsure whether a refund on their entries was affected.
CBP held ACE system maintenance overnight on March 28-29, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, March 28, 2026, to 4:00 a.m. ET Sunday, March 29, 2026. The message did not describe what functions were affected during the window. This notice was for planning around a past system outage.
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This maintenance window has passed and does not affect entries filed today. Clients do not need to take any action regarding this notice. If a client believes an entry was affected by this outage, they should ask us to review it.
CBP reported temporary ACE air manifest system outage in March 2026
CBP announced degradation in ACE air manifest processing on March 24, 2026. It said ACE MMM/TMM and EDI processing would be unavailable for about 45 minutes while it restarted services. CBP said it would send a follow-up message once the issue was resolved.
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This was a short, one-time system outage from March 2026 and does not affect current filings. Clients do not need to act on this notice. If a client has questions about entries filed during that window, they should ask us to review the specific entry.
CBP resolved earlier ACE Air Manifest processing slowdown
CBP announced that a processing degradation issue affecting ACE Air Manifest had been resolved and that ACE was operating normally again. The message did not describe the cause or duration of the issue. It applied to air cargo manifest filings processed through ACE.
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This was a routine system status update from March 2026 about a temporary ACE Air Manifest slowdown that CBP said was fixed. It did not change any filing requirements, so it has no ongoing effect on entries we file today. Clients do not need to take any action regarding this notice.
CBP held ACE maintenance window in March 2026, now past
CBP announced an ACE production standard invasive maintenance window from 10:00 p.m. ET Saturday, March 21, 2026, to 4:00 a.m. ET Sunday, March 22, 2026. This affected system availability for filers using ACE during that window. The maintenance is complete and this notice is now historical.
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This was a routine, time-limited system maintenance notice from March 2026 and it has already passed. It does not affect any entries we file today. Clients do not need to take any action regarding this notice.
CBP tested first phase of ACE manifest system upgrade in early 2026
CBP announced that it was modernizing the ACE ocean, rail, and air manifest systems in stages. The first release (INT-060) was a back-end technical migration that CBP said would not change the ACE user experience or EDI behavior. CBP scheduled deployment to the production environment for April 25, 2026, after testing in the certification environment.
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This update concerned CBP's internal manifest system and the software developers who connect to it, not the entries we file for clients. CBP stated the change would not affect EDI behavior, so it should not have changed how we transmit manifest or entry data. Clients did not need to take any action on this notice, and later CSMS messages may contain further manifest modernization releases that we track separately.
CBP added ACE checks for Section 232 auto and truck parts drawback claims
CBP said two new ACE error validations for drawback claims under 1313(a) and 1313(b) were deployed to the ACE test environment on March 17, 2026. The validations support Proclamation 10984 on medium and heavy duty vehicles, vehicle parts and buses. They flag claims dated before November 1, 2025, claims missing both the eligible Section 232 HTS number and the Chapter 1 to 97 HTS number, or claims that exceed the money available on the entry summary line. CBP said these validations would move to the production ACE environment on April 21, 2026.
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We file duty drawback claims for clients, including claims tied to Section 232 tariffs on auto and truck parts. This message describes validations CBP added to catch incomplete or overclaimed drawback claims under 1313(a) and 1313(b). The production deployment date in the message has already passed, so clients with pending or planned drawback claims on these goods should ask us to review their claim data for the required HTS numbers and amounts.
CBP held ACE certification maintenance window on March 18, 2026
CBP announced an ACE certification standard invasive maintenance window on March 18, 2026, from 5:00 p.m. to 8:00 p.m. ET. This was a routine system maintenance notice affecting the ACE certification environment.
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This was a routine, time-limited maintenance notice for the ACE certification environment and did not require any client action. Clients did not need to do anything in response to this message.
CBP added ATA Carnet data fields to ACE truck manifest filings starting March 24, 2026
CBP announced that on March 24, 2026 it enhanced ACE to let trade users submit ATA Carnet information as part of an electronic truck manifest filing. The update included EDI impacts and CBP published a trade information notice with details. The change applied to truck manifest filers moving goods under carnet.
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This update concerns carriers and filers who submit electronic truck manifests, not the entries we file for importers. It does not change how we file formal, informal or other entry types for clients. Clients do not need to take any action on this notice.
The summaries and positions are general information, not legal advice. Always check the official CBP message, which each page links to.
Does a change affect your entries?
Call (908) 291-8001 or email info@alliedchb.com