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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 Reschedules Support Call for New Mail Entry Type 13 Test
CBP rescheduled the Pre-Deployment Support Call for the ACE Entry Type 13 test covering international mail processing to September 15, 2026 at 1:00 p.m. ET. The Post-Deployment Support Call stays on October 7, 2026 at 1:00 p.m. ET. Both calls cover upcoming ACE enhancements for the Entry Type 13 test (INT-057, CBP-290) for mail shipments.
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We are monitoring this ACE test because it may eventually change how we file entry type 13 for mail shipments. No filing procedures change because of this notice, and clients do not need to take any action now. We will tell clients if CBP finalizes rules that affect their mail entries.
CBP's 2026 ACE User Satisfaction Survey has closed
CBP asked ACE trade community users to complete a voluntary, anonymous satisfaction survey about the ACE system. The survey window ran through September 11, 2026. CBP said a higher response rate would give it a more accurate picture of user experience.
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This survey concerned voluntary feedback on the ACE system, not entry filing requirements. It closed on September 11, 2026, so there is no remaining action. Clients do not need to do anything about this notice.
CBP finalizes rule requiring electronic export manifests for rail cargo
CBP published a final rule on August 26, 2026 requiring Electronic Export Manifest (EEM) filing in ACE for rail cargo departing the U.S. to Mexico or Canada. The rule sets electronic transmission requirements, eligible filers, and submission timeframes before departure. It takes effect October 26, 2026, but CBP will not begin enforcing it until October 26, 2027.
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This rule concerns rail carriers and parties who file export manifests, not import entries that we file for clients. We do not file export manifests, so this does not change the entries we handle. Clients who also move cargo outbound by rail to Mexico or Canada should confirm with their carrier or export filer that they will be ready for ACE EEM filing before the October 2027 enforcement date.
CBP held ACE maintenance overnight on August 29-30, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, August 29, 2026 to 4:00 a.m. ET Sunday, August 30, 2026. This affected system access for filers using ACE during that window.
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This was a routine overnight maintenance window that has already passed. It did not require any action from clients, and any related delays would have been temporary and limited to that period.
CBP's ACE User Satisfaction Survey Closed September 11, 2026
CBP asked all Automated Commercial Environment (ACE) trade community users to complete a voluntary, anonymous satisfaction survey about ACE. CBP extended the survey deadline to 11:59 p.m. ET on September 11, 2026. The survey aimed to gauge user satisfaction with ACE's capabilities and experience.
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This survey does not affect the entries we file for clients. It was a voluntary CBP feedback request that has now closed. Clients do not need to take any action.
CBP held ACE test system maintenance on August 26, 2026
CBP announced an invasive maintenance window for the ACE certification (test) environment on August 26, 2026, from 5:00 p.m. to 8:00 p.m. ET. This was a scheduled maintenance notice, not a change to the production ACE system.
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This maintenance affected only the ACE certification test environment, not live filings. It has no bearing on entries we file for clients today. Clients do not need to take any action regarding this notice.
CBP barred PSC changes to IEEPA HTS on FTZ entry type 06
CBP announced an update to the ACE CATAIR Error Dictionary adding a new validation, error F883, that blocks a Post Summary Correction from modifying the IEEPA HTS on a Foreign Trade Zone entry type 06. CBP deployed the change to its certification and production systems on August 21, 2026. The update affects filers submitting PSCs on FTZ entries with an IEEPA HTS line.
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This update applies to Foreign Trade Zone entry type 06 filings, and Allied does not operate or manage foreign trade zones. We do not expect this validation to affect the entries we file for clients. Because IEEPA duties themselves ended on February 20, 2026, clients with questions about how this rule applies to their entries should ask Allied to review the specific filing.
CBP asked ACE users to complete a 2026 satisfaction survey (survey closed)
CBP announced a voluntary, anonymous 2026 ACE User Satisfaction Survey open to all Automated Commercial Environment users. The survey asked users to rate their satisfaction with ACE capabilities and experience. It closed at 11:59 p.m. ET on August 28, 2026.
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This was a voluntary CBP survey about the ACE system and did not affect entries we file. The survey window closed on August 28, 2026, so no action is available now. Clients did not need to do anything at the time and do not need to do anything now.
CBP completed backend rail manifest system upgrade in ACE
CBP announced a second release (INT-061) of its ACE manifest modernization project, covering a technical backend migration for rail mode manifests. The message stated this release would not directly change the ACE user experience or EDI behavior. CBP scheduled deployment to the production environment for September 22, 2026, after testing in the certification environment.
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This update concerns CBP's internal rail manifest systems and trade software developers, not the entries we file for clients. CBP said the change would not alter EDI behavior or the user experience, so it should not affect how we transmit or process entries. Clients do not need to take any action regarding this release.
CBP held ACE maintenance window in August 2026, now past
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on August 22, 2026 to 4:00 a.m. ET on August 23, 2026. This affected ACE availability for filers during that window. The maintenance date has passed.
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This was a routine ACE maintenance window that occurred over a single overnight period in August 2026. It required no action from clients then and requires none now. Clients with questions about entries filed around that time should ask us to review them.
CBP held ACE certification test environment maintenance on August 19, 2026
CBP announced an ACE certification standard invasive maintenance window on August 19, 2026, from 5:00 p.m. to 8:00 p.m. ET. This affected the ACE certification (test) environment used for system testing, not the production filing system. The message did not name any specific transactions or services affected.
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This notice concerned a scheduled maintenance window in CBP's ACE test environment and did not affect entries we filed for clients. The window has passed and had no lasting effect on current filings. Clients do not need to do anything about this notice.
CBP Urged Importers to Check ACH Enrollment to Avoid Refund Rejections
CBP announced that brokers and importers could use the ACE REV-613 report to find refunds rejected for missing ACH enrollment. It advised affected importers to enroll for ACH refunds in the ACE Portal and notify CBP's ACH refund support email. CBP warned that importers not enrolled in ACH could keep experiencing refund delays or rejections.
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This notice concerns how importers receive refund payments from CBP, including duty refunds tied to entries we file. We recommend clients confirm their ACH enrollment status is current, since this affects how quickly they receive any refunds, including IEEPA duty refund payments. Clients who are unsure of their ACH enrollment status should contact Allied so we can help review their entries and refund records.
CBP held ACE maintenance overnight on August 15-16, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, August 15, 2026 to 4:00 a.m. ET on Sunday, August 16, 2026. The notice affected users of the ACE system during that window. It did not describe any change to filing rules or requirements.
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This was a routine system maintenance notice and it has already passed. It did not change any filing requirements, so clients do not need to act. If clients had questions about entries filed around that maintenance window, they can ask Allied to check the status.
CBP updated Entry Type 13 rules in ACE Cargo Release CATAIR and error codes
CBP posted draft updates to the ACE Cargo Release CATAIR and Cargo Release Condition Codes documents covering Entry Type 13. The changes update several CATAIR notes and delete or revise certain error codes. CBP said the updates were expected to deploy to the ACE production environment on September 22, 2026.
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This is a technical filing update for Entry Type 13, which Allied uses for mail entries. We apply the updated CATAIR notes and error codes to the entry type 13 filings we submit through ABI now that the deployment date has passed. Clients do not need to do anything.
CBP held ACE certification maintenance window on August 12, 2026
CBP announced an ACE certification standard invasive maintenance window on August 12, 2026, from 5:00 p.m. ET to 8:00 p.m. ET. This affected the ACE certification environment used for testing, not production filings. The message did not name any affected filers or entry types.
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This notice concerned a test environment maintenance window that has already passed. It did not require any action from clients then and has no bearing on entries we file now. Clients do not need to do anything about this message.
CBP posts updated ACE deployment schedule (notional)
CBP announced on August 11, 2026 that it posted an updated Automated Commercial Environment (ACE) Development and Deployment Schedule on CBP.gov. CBP described the schedule as notional and subject to change. The notice pointed readers to CBP.gov/ACE for the most current deployment information.
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This message concerns brokers and system developers who track ACE deployment timing. It does not change any filing requirement for the entries we file for clients. Clients do not need to act.
CBP resolved an ACE quota processing issue affecting certain chapter 99 HTS codes
CBP announced on August 6, 2026 that it had resolved an issue with quota processing in ACE. The issue involved specific chapter 99 HTS codes. The message followed CSMS # 69395228, which reported the issue.
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This notice closed out a temporary ACE system issue, and clients did not need to act. Later CSMS messages may have changed quota processing, so clients with questions about entries under chapter 99 codes should ask Allied to review them.
CBP held ACE maintenance window in August, now past
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on August 8, 2026 to 4:00 a.m. ET on August 9, 2026. The message did not describe any effect on filings beyond the maintenance window itself. This notice is now more than 30 days old.
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This was a routine ACE 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. Clients do not need to do anything about this notice now.
CBP reported a quota processing glitch for certain Chapter 99 HTS codes in ACE
CBP announced on July 30, 2026 that it found a problem with quota processing in the Automated Commercial Environment (ACE) affecting specific Chapter 99 harmonized tariff schedule codes. CBP said it was investigating the issue and would issue a follow-up message once a solution was implemented. The message did not name the affected codes or give a timeline for a fix.
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This notice affects quota entries tied to certain Chapter 99 HTS codes in ACE. We do not know if CBP has since resolved the issue or issued a follow-up message, so clients with quota entries from this period should ask us to review whether their specific entries were affected.
CBP held ACE maintenance window August 1 to 2, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, August 1, 2026 to 4:00 a.m. ET Sunday, August 2, 2026. This was a scheduled system maintenance window that could affect ACE availability during that period.
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This was a routine, time limited ACE maintenance window that has already passed. It required no action from clients then or now, and it has no bearing on current entries.
CBP updated draft CATAIR guidance for Entry Type 13 prior notice filing
CBP announced an update to the draft ACE CATAIR Stand-alone Filing for Prior Notice Data (PE/PX) document. The update added guidance covering Entry Type 13. CBP posted the revised draft chapter on cbp.gov and directed questions to its CREM mailbox.
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This update concerns the technical filing specifications that brokers like Allied use to submit prior notice data for entry type 13 mail entries. It does not require action from importers or shippers. Later CSMS messages may have changed these technical requirements further, so clients with questions about their entry type 13 filings should ask Allied to review them.
CBP held ACE certification maintenance window on July 29, 2026
CBP announced a standard invasive maintenance window for the ACE Certification environment on July 29, 2026, from 5:00 p.m. to 8:00 p.m. ET. The message did not describe any effect on production ACE filings. This is now a past, routine maintenance event.
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This notice concerned a certification test environment, not production filing, so it did not affect entries we filed for clients. No client action was needed at the time, and none is needed now.
CBP held ACE maintenance window in late July 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, July 25, 2026 to 4:00 a.m. ET on Sunday, July 26, 2026. This affected ACE availability for filers during that window.
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This was a routine, time limited maintenance window that has already passed. It does not affect entries filed today, and clients do not need to take any action.
CBP posted more technical guides for the mail Entry Type 13 test in ACE
CBP announced on July 20, 2026 the Entry Type 13 test for U.S. mail processing in ACE through CSMS 69289734. This follow-up message said CBP had published additional draft guides, the ACE CATAIR Entry Summary Query and the ACE CATAIR Error Dictionary for Entry Summary, to support that test. CBP said any future updates would be announced by separate CSMS message.
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This message only added technical documentation for the ACE mail Entry Type 13 test and did not change entry filing requirements itself. It affected system programming for parties involved in mail entry processing, not day to day filing steps for our clients. Clients with mail shipments should ask us if they want to know how the Entry Type 13 test or later CSMS updates affect their entries.
CBP held ACE certification maintenance window on July 22, 2026
CBP announced an extended invasive maintenance window for the ACE certification environment on July 22, 2026, from 5:00 p.m. to 10:00 p.m. ET. The message did not describe any impact on production ACE filings. This notice is now historical.
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This affected only the ACE certification (test) environment, not production filings. It did not require action from Allied or our clients then or now. Clients do not need to do anything about this notice.
CBP rolled out new Entry Type 13 for U.S. mail shipments in ACE
CBP announced it would deploy the Entry Type 13 Test in ACE for U.S. Mail Processing to the CERT environment on July 24, 2026, and to the PROD environment on September 22, 2026. The change created a new entry type, ET13, for submitting USPS international mail shipment data, following the suspension of the de minimis exemption. It included updates to electronic data interchange and several ACE implementation guides for cargo release, entry summary and manifest.
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This deployment set up the electronic process we use to file mail entries under the new Entry Type 13 after de minimis was suspended. Since the PROD deployment date has passed, this process should now be in effect for mail shipment filings. Clients who ship by international mail should ask us to confirm how their shipments are being entered under this process.
CBP added new ACE validation checks for Section 232 auto parts offset licenses
CBP announced that on July 18, 2026 it deployed a new validation in ACE for import adjustment offset licenses used against Section 232 duties on automobile and medium and heavy duty vehicle parts. The update added two error codes: one flags a license submitted on a line where chapter 99 duty is not present, and one flags a license with a balance too low to cover the submitted duty. CBP posted the updated ACE CATAIR Error Dictionary V51 on CBP.gov to reflect these changes.
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This applies to filers who use import adjustment offset licenses against Section 232 duties on auto parts, not to importers generally. We check that any offset license we submit matches the duty status of the corresponding chapter 99 HTS line and carries enough balance, so entries do not trigger these ACE errors. Clients who import automobile or medium and heavy duty vehicle parts under Section 232 and use offset licenses should ask us to review how their entries are filed.
CBP adds new ACE error code for inactive importer numbers
CBP posted an updated ACE CATAIR Error Dictionary that adds error code F875, which flags an importer of record number as inactive for entry purposes if too much time has passed since its last entry summary. The change went live in the CERT environment on June 30, 2026 and in production on July 16, 2026. This is a technical documentation update for filers who transmit entry summaries through ACE.
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This message concerns entry summary transmission mechanics and does not create new obligations for importers. If an importer of record has not filed entries in a long time, Allied may need to confirm the importer number is active before we can transmit an entry summary on their behalf. Clients do not need to take action unless we contact them about an inactive importer number affecting one of their entries.
CBP held ACE maintenance window in July 2026, now past
CBP announced an ACE Production Standard invasive maintenance window from 10:00 p.m. ET on July 18, 2026 to 4:00 a.m. ET on July 19, 2026. This is a historical notice about a system outage that has already occurred. The message did not describe any lasting rule change.
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This was a routine, one time maintenance window that has already passed. It did not change any filing requirement, so it has no ongoing effect on entries we file. Clients do not need to take any action regarding this notice.
CBP ran ACE maintenance window on July 15, 2026
CBP announced an ACE certification standard invasive maintenance window on July 15, 2026, from 5:00 p.m. to 8:00 p.m. ET. This was a scheduled system maintenance event on the ACE certification environment. The message did not describe effects on production filings.
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This was a routine maintenance notice for the ACE certification environment and the window has passed. It required no action from clients then or now.
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?
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