HMRC CDS Trader Dress Rehearsal (TDR) Service Planned Outage
HMRC have asked Albacore to advise you that, due to scheduled maintenance, the CDS Trader Dress Rehearsal (TDR) service will be unavailable during the period below:
From: 08:30 Tuesday 29th September 2026
To: 09:00 Wednesday 30th September 2026 (24.5 hours, UK time)
There will be a complete outage during this period.
During this maintenance window HMRC will be refreshing the below data held in TDR:
• Where applicable, aligning the CDS TDR environment to Production CDS 5.3.0 Release (which will take place on 26th September 2026).
• Refreshing Trader personal, account, and licensing data held in CDS TDR, using data which will be copied from Production on 29th September 2026.
• Refreshing UK/EU Tariff data held in CDS TDR, using data which has been copied from Production on 9th September 2026.
*Trader Dress Rehearsal is a sandbox environment and is regularly refreshed with Trader data and data from the Online Tariff on a given date, as such any CDS changes to Trader data in the live service or updates to the Online Tariff will not be reflected in TDR instantaneously.
HMRC apologise for any inconvenience this outage may cause and appreciate your understanding while these essential updates are completed.
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