United KingdomChartered Institute of Taxation
CDS unavailable 26–27 Sep 2026: plan declarations around longer outage
CDS is down for all users 7 PM Sat 26 Sep to 8.30 AM Sun 27 Sep 2026 — longer than usual. Declarations queue until the end; GMR actions could be affected and export P2P must be secured before the outage.
By Taxxa AI OyPublished 11 September 2026
The Customs Declaration Service (CDS) will be unavailable to all users from 7 PM on Saturday 26 September 2026 until 8.30 AM on Sunday 27 September 2026 while scheduled maintenance is carried out. The notice flags that this outage will be longer than usual and urges businesses that file customs declarations through CDS to take the mitigating steps described below so disruption is kept to a minimum.
Declarations submitted during the outage window will not be lost: they will be processed at the end of the downtime. Businesses should nevertheless plan submission timings around the window, because nothing will clear while the service is downTAX and a backlog will be worked through once it returns.
Goods movement references (GMRs) linked to CDS may also be affected. Creating, updating or embarking a GMR connected to CDS could fail or behave unexpectedly during the times listed, so hauliers and intermediaries that rely on the Goods Vehicle Movement Service (GVMS) should consult the GVMS service availability and issues page before travelling and allow extra time for border crossings that span the outage.
For import movements using GVMS during the outage, customers should check the declaration status and arrive where necessary, following the guidance on manually arriving goods in the UK.
Consignments containing controlled goods that travel under pre-lodged declarations need particular care. The notice directs those moving such consignments to follow the published guidance and to attend port inspection facilities or Inland Border Facilities so the goods can be inspected and released. Businesses moving controlled goods over that weekend should therefore confirm inspection opening arrangements and build the attendance step into their plans rather than assuming a pre-lodged declaration alone will release the goods.
Exporters face a before-or-after choice for permission to progress (P2P). Where goods move from locations that require an arrived export, the declaration must be submitted and permission to progress (P2P) obtained before the outage beginsTAX. From any other location, exporters must either arrive at the border location and obtain P2P before the outage or hold the movement until after the outage ends
TAX.
This is an operational service notice about the stated maintenance window and the arrival and P2P steps above.
Submit declarations due over the weekend of 26-27 September 2026 early, secure export permission to progress before 7 PM on 26 September, and plan GVMS arrivals around the outage window.