ACE Quota Processing Fix and Maintenance Window: August 2026
Key Points
- CBP confirmed on August 6, 2026 that the ACE quota processing issue affecting specific Chapter 99 HTS codes has been fully resolved (CSMS #69458036).
- ACE will undergo standard invasive maintenance from 10:00 p.m. ET Saturday, August 8, 2026 to 4:00 a.m. ET Sunday, August 9, 2026 (CSMS #69457726).
- During the maintenance window, ACE production will be unavailable; brokers and importers should plan filings accordingly.
- The quota processing fix is linked to the earlier outage reported under CSMS #69395228.
On this page
- What changed: the quota processing fix
- Affected HTS coverage: Chapter 99 codes
- Upcoming ACE maintenance window: dates and times
- What importers, brokers, and compliance teams should do
- Key references
CBP has resolved a quota processing error in ACE that was preventing correct handling of entries filed under certain Chapter 99 HTS codes, and has separately scheduled a six-hour invasive maintenance window for the weekend of August 8 to 9, 2026. Both developments require immediate attention from anyone filing quota-sensitive or time-critical entries over the coming days.
The links in this article go to the primary documents: the official CBP CSMS bulletins themselves. Read the source.
What changed: the quota processing fix
On August 6, 2026, CBP issued CSMS #69458036 confirming that the quota processing issue in the Automated Commercial Environment (ACE) has been resolved. The original problem, tracked under CSMS #69395228, affected specific harmonized tariff schedule codes in Chapter 99. CBP did not specify which Chapter 99 codes were impacted, so filers who experienced rejections, holds, or anomalies on quota entries during the outage period should review those entries for accuracy now that the system is restored.
Affected HTS coverage: Chapter 99 codes
Chapter 99 of the Harmonized Tariff Schedule is the temporary provisions chapter that houses Section 301, Section 232, and other special tariff programs, as well as quota and tariff-rate quota (TRQ) classifications. A processing error in this chapter can affect duty calculations, quota fill reporting, and TRQ over-quota duty assessments across a wide range of products. Filers using Chapter 99 codes for any tariff-action or quota-driven classification should confirm that entries submitted during the outage period were processed correctly.
Upcoming ACE maintenance window: dates and times
Separately, CSMS #69457726 announces that ACE production will be taken offline for standard invasive maintenance from 10:00 p.m. ET Saturday, August 8, 2026 through 4:00 a.m. ET Sunday, August 9, 2026, a window of approximately six hours. "Invasive" maintenance means CBP is making changes to system components that require the production environment to be fully offline, not simply in a degraded state. Entry submission, quota filing, and other ACE transactions will be unavailable for the duration.
What importers, brokers, and compliance teams should do
- Review any quota or TRQ entries filed under Chapter 99 HTS codes during the earlier outage period to confirm they were processed correctly and that duty and quota-fill data are accurate.
- Schedule any time-sensitive ACE filings, including quota entries and entry summaries with Chapter 99 classifications, to be submitted before 10:00 p.m. ET on Saturday, August 8, 2026 or after 4:00 a.m. ET on Sunday, August 9, 2026.
- Subscribe to CBP CSMS alerts at cbp.gov to receive future system-status and maintenance notices directly.
Key references
- CSMS #69458036 - CBP confirmation that the ACE quota processing issue affecting Chapter 99 HTS codes is resolved (August 6, 2026)
- CSMS #69457726 - CBP notice of ACE invasive maintenance, 10:00 p.m. ET August 8 to 4:00 a.m. ET August 9, 2026
- USITC Harmonized Tariff Schedule - Official HTS including Chapter 99 temporary provisions
- CBP Cargo Systems Messaging Service - Subscribe to ACE system alerts
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