Customs Declaration Service last date deferment adjustments (March 2026 to February 2027)
Updated 13 January 2026
© Crown copyright 2026
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This publication is available at https://www.gov.uk/government/publications/chief-last-dates-for-adjustments-to-deferment-periods/customs-declaration-service-last-date-deferment-adjustments-march-2026-to-february-2027
These are the last dates for late item input and adjustments to the Customs Declaration Service.
Custom and VAT period
| Month | Last date for Custom and VAT period | Number of calendar days available |
|---|---|---|
| 1 March 2026 to 31 March 2026 | 10 April 2026 | 10 |
| 1 April 2026 to 30 April 2026 | 10 May 2026 | 10 |
| 1 May 2026 to 31 May 2026 | 10 June 2026 | 10 |
| 1 June 2026 to 30 June 2026 | 10 July 2026 | 10 |
| 1 July 2026 to 31 July 2026 | 10 August 2026 | 10 |
| 1 August 2026 to 31 August 2026 | 10 September 2026 | 10 |
| 1 September 2026 to 30 September 2026 | 10 October 2026 | 10 |
| 1 October 2026 to 31 October 2026 | 10 November 2026 | 10 |
| 1 November 2026 to 30 November 2026 | 10 December 2026 | 10 |
| 1 December 2026 to 31 December 2026 | 10 January 2027 | 10 |
| 1 January 2027 to 31 January 2027 | 10 February 2027 | 10 |
| 1 February 2027 to 28 February 2027 | 10 March 2027 | 10 |
Late supplementary declaration estimates should be submitted by 5pm on the 10th of the month, except for April, September, December 2026 and March 2027.
Late supplementary declaration estimates for:
- April 2026 should be submitted by 5pm on 8 May 2026
- September 2026 should be submitted by 5pm on 9 October 2026
- December 2026 should be submitted by 5pm on 8 January 2027
- March 2027 should be submitted by 5pm on 9 April 2027
Excise period
| Month | Last day of excise period | Number of working days available |
|---|---|---|
| 15 March 2026 to 14 April 2026 | 21 April 2026 | 5 |
| 15 April 2026 to 14 May 2026 | 20 May 2026 | 4 |
| 15 May 2026 to 14 June 2026 | 19 June 2026 | 5 |
| 15 June 2026 to 14 July 2026 | 21 July 2026 | 5 |
| 15 July 2026 to 14 August 2026 | 20 August 2026 | 4 |
| 15 August 2026 to 14 September 2026 | 21 September 2026 | 5 |
| 15 September 2026 to 14 October 2026 | 21 October 2026 | 5 |
| 15 October 2026 to 14 November 2026 | 19 November 2026 | 4 |
| 15 November 2026 to 14 December 2026 | 17 December 2026 | 3 |
| 15 December 2026 to 14 January 2027 | 21 January 2027 | 5 |
| 15 January 2027 to 14 February 2027 | 18 February 2027 | 4 |
| 15 February 2027 to 14 March 2027 | 17 March 2027 | 3 |