TSS Bulletin 228th Edition

Published: 24 September 2026|Bulletins

The outgoing Trader Support Service: key dates and actions
Closing your Supplementary Declaration: actions to take now
Measure 2025/1227 Movements Delivery Solution
Get ready for the new Trader Support Service

Welcome to this week’s bulletin: Countdown: 4 weeks until new TSS goes live – what you need to do now

The outgoing Trader Support Service: key dates and actions

The Trader Support Service (TSS) will move to a new platform and provider on 20 October 2026. Businesses need to prepare for this transition now. This article sets out the key deadlines and the actions your business needs to complete on the outgoing TSS so that you are ready for the change.

Summary of key deadlines for the outgoing TSS

You will no longer be able to pre-lodge declarations on the outgoing TSS for goods movements with an arrival date on or after 20 October 2026
For goods movements with arrival dates on or after 20 October 2026, declarations must be submitted through the new TSS platform only. The outgoing TSS cannot be used for these movements
Access to the outgoing TSS will end on 30 November 2026. You must close all your outstanding Supplementary Declarations and download any information you need before this date. Access to the outgoing TSS will not be available after this deadline. For further information, please see the related article Closing your Supplementary Declarations – actions to take now below

Further actions to take now

Check your Company Profile in the outgoing TSS and ensure the following information is accurate and up-to-date before it is migrated to the new TSS:
- company details such as business addresses and EORI numbers
- primary user information
- the list of existing users, including deactivating accounts that are no longer required
- contact information, including valid email addresses
- authorisations such as UK Internal Market Scheme (UKIMS), Northern Ireland Retail Movement Scheme (NIRMS) and Simplified Customs Declaration Processes (SCDP)
- UKIMS and Trader Goods Profile (TGP) access permissions
- agent and intermediary relationships
- payment information

Secure and access your data: you can download any information you need from the current TSS Portal up to and including 30 November 2026 by logging into the TSS Portal and following the instructions outlined in the How to use the TSS portal guide on NICTA. You will find the relevant instructions on page 29 onwards of this guide, in section 6, titled ‘Obtaining information for your goods movements in TSS’

You can also access your declaration data through the HM Revenue & Customs (HMRC) Trade Reporting and Extracting (TRE) service. TRE provides free access to Customs Declaration Service (CDS) data from the previous four years, with each request covering up to 31 days. To use TRE, log into your organisation’s UK Government Gateway account linked to your GB EORI number.

Continue to check the Terms and Conditions in the outgoing TSS for updates during its final weeks. You should check regularly and take any required action that affects your business

Closing your supplementary declaration: actions to take now

Supplementary Declarations must be submitted no later than the tenth calendar day of the month following your goods movement.

The outgoing TSS will move to a new platform on 20 October 2026. You will continue to have access to the outgoing TSS up to and including 30 November 2026. You must use this remaining period to review and close all outstanding Supplementary Declarations before access ends.

Actions to take

A declaration is not complete until it shows as Closed on the TSS Portal. You must check any unclosed declaration, identify what is preventing closure and take the required action immediately.

To find your outstanding Supplementary Declarations in the TSS Portal, go to Goods Movements > View a Goods Movement, then select Supplementary Declarations (by consignment) from the Type filter.

Declarations in the statuses below have outstanding requirements and must be dealt with now. Prioritise the oldest items first using the date filters:

‘Draft SUP Declarations’

Complete all mandatory fields, confirm the movement information is correct and select Submit without delay

‘Input Required SUP Declarations’

Open the consignment, correct the error shown, update the declaration and select Reprocess promptly. For more details on error codes, see the Guidance on resolution to common error codes for Supplementary and Full Frontier Declarations guide on NICTA

‘Pending Payment SUP Declarations’

Make the VAT and/or duty payment immediately or ensure your Duty Deferment Account (DDA) has sufficient funds, so the declaration can move to Closed status. See the Payments Guide on NICTA for more information on available methods of payment and what payments you may need to make

‘Tax Calculation Verification Declarations’

Review the CDS calculation and select Accept Calculation. If amendments are needed, select Recall to Draft, make the required changes and resubmit immediately

‘Fiscal Hold SUP Declarations’

Make funds available immediately. This status will remain in place until there are sufficient funds for VAT and/or duty to be collected

It will not be possible to submit new movements with arrival dates of 20 October 2026 onwards through the outgoing TSS. You must continue checking the TSS Portal, including Post-Movement To-Dos and Post-Movement Submission Status, up to and including 30 November 2026 to ensure all outstanding Supplementary Declarations are Closed before access ends.

See the Supplementary Declarations: Step-by-Step Guide and the Payments Guide on the NICTA website for more details.

Measure 2025/1227 Movements Delivery Solution

There has been an ongoing issue affecting movements of certain food and agricultural goods and fertilisers into Northern Ireland (NI). An error meant that an ‘at risk’ tariff was incorrectly being calculated due to the way the European Union (EU) has implemented Regulation 2025/1227 on goods from Russia and Belarus.

The measure should only have applied to those goods exported, directly or indirectly, from Russia or Belarus. However, an additional duty rate was triggered in CDS for movements into NI.

HMRC has been working to resolve this issue and an update to CDS on 26 September will correct the way the duties are calculated.

Get ready for the new Trader Support Service

From 20 October 2026, you will no longer be able to use the outgoing TSS to start new goods movements. Take these steps now so you and your team are ready:

Use the new TSS Practice Environment now

The Practice Environment is now live and you have been sent a link via email with instructions on how to access it.

You and your team can use it to practice submitting declarations, explore the new functionality, such as CSV file upload, and become familiar with the new platform before you need to use it for live movements.