France’s new DELTA I declaration checks are live from 8 September 2026
French Customs lists the new DELTA I validation checks for supplementary declarations and duplicated taxable bases as live from 8 September. This is mainly a technical update for declarants, carriers and brokers.
- Who this affects
- Customs declarants, carriers and brokers lodging import declarations through DELTA I in France.
- Seller action
- Mainly for your carrier or customs broker
Most UK sellers need no direct change. Ask the French clearance provider to confirm that its declaration logic is current.
- Effective dates / current position
- Live from 8 September 2026
- Last reviewed
- 8 Sept 2026 — an editorial source check, separate from automatic timing.
- Official source
- Open the primary source ↗
What has French Customs announced?
French Customs lists version 2.10 of DELTA I with a live date of 8 September 2026. The release notes describe additional import-declaration validation and a correction to the way deadlines for supplementary declarations are recalculated following an advance presentation.
What changes in the declaration?
- A check of the supplementary declaration type to prevent incorrect codes.
- Changes to validation of special mention 00100 for requests involving special procedures on the declaration.
- An internal rejection control where the same tax contains a duplicated taxable base.
- A correction to recalculation of the deadline for lodging a supplementary declaration following advance presentation.
What this means for UK sellers
The release does not change the temporary €3 low-value customs duty, VAT, IOSS or the €150 threshold. It affects the customs declaration and the systems used to submit it.
For most standard business-to-consumer parcels cleared through DELTA H7, there is no immediate seller-side change. Where a shipment is cleared through DELTA I, the French declarant should ensure its systems use the current validation logic. Incorrect declaration codes or a duplicated taxable base may result in rejection.
UK sellers should continue supplying accurate descriptions, values, classifications and supporting commercial information. Their carrier or broker remains responsible for translating that information into the correct French customs declaration.
Official source
French Customs: Import–Export update dated 7 September 2026 ↗