The supplementary declaration is the final step in the import process and one that you are legally required to complete.

If you moved goods between 14 January and 14 February, you will shortly receive emails from TSS informing you that you have supplementary declarations to complete.

For goods moved between 1- 13 January, you will have received an email informing you that you can now complete your supplementary declarations. You must complete these by 1 May.

See the table below for HMRC’s supplementary declaration submission dates:

Movement dates 2021 Supplementary declaration submission dates 2021
1-13 January 1 May
14-31 January 14 May
1-28 February 1 June
1-31 March 28 June
1-30 April 28 June

If you need additional support with your supplementary declarations you can:

  • Talk to a TSS customs expert about tariff options and how to complete the supplementary declaration. Call the TSS helpline on 0800 060 8888 from 7:30am to 10:30pm seven days a week or raise a case on the TSS portal
  • Read guidance on completing supplementary declarations (available here) explaining tariff options, the data you need to provide and the simplifications on offer

To avoid paying unnecessary duty, you should also consider the options outlined in this tariff guide before submitting your declaration.

Please note that you are not yet required to submit declarations for any goods that use non-standard customs procedure codes or that require unreleased bulk API upload functionality. TSS will contact you at a later date to complete these submissions.