TSS Bulletin 229th Edition

Published: 8 October 2026|Bulletins

The outgoing Trader Support Service: key dates and actions
Closing your Supplementary Declaration: actions to take now
20 October is approaching: are you ready?

Welcome to this week’s bulletin: Countdown: new TSS goes live 12 days – 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 actions your business needs to complete on the outgoing TSS so that you are ready for the change.

Act before 30 November 2026: You must close all outstanding Supplementary Declarations and download any information you need from the outgoing TSS before access to this service ends on 30 November.

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 can now be submitted through the new TSS. The outgoing TSS cannot be used for these movements
Download any information you need from the current TSS Portal by 30 November 2026. You can also access your declaration data through the HM Revenue & Customs (HMRC) Trade Reporting and Extracting (TRE) service. To use TRE, log into your organisation’s GOV.UK Government Gateway account linked to your GB EORI number
As access to the outgoing TSS will end on 30 November 2026, you must close all your outstanding Supplementary Declarations before this date. For further information, please see the related TSS Trader Bulletin article below: ‘Closing your Supplementary Declarations – actions to take now’

Closing your Supplementary Declaration: actions to take now

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.

Other key dates you must act on

20 October 2026 – The outgoing TSS moves to the new platform. No new movements can be submitted on the outgoing TSS platform.

30 November 2026 – Final day to access the outgoing TSS platform.

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

Actions to take

A declaration is not complete until it shows as Closed on the TSS Portal. You must check each outstanding 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 Customs Declaration Service (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. This is the final date 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.

20 October is approaching: are you ready?

From 20 October 2026, all new movements and declarations will need to be started on the new TSS platform.

By now, you should have logged in, checked your account and started familiarising yourself with the new platform. If you have not, act now. Delaying these checks may impact your readiness to use the new service.

Check your account is ready

Make sure you have logged in to the new TSS and check your account that:

your business profile is correct
the right users and permissions are set up
any services and payment methods you use are connected

If anything is not set up correctly, resolve it now to reduce the risk of operational delays from 20 October.

If you need any help, one-to-one support is available. Contact the new Trader Support Service Contact Centre on 0800 870 8173, 8am-5:30pm, 7 days a week.