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What to know

EORI Number

EORI stands for Economic Operator Registration and Identification number. For any scenario, this number is mandatory for exporting and importing goods to/from the UK.
Apply for an EORI number if you do not already ship goods outside the EU. The registration for the EORI can be done via the website of local customs authorities (it can take up to 3 days). 

HS (Harmonized System) code

The HS codes are also known as Commodity Codes. These codes allow customs to identify the type of product, the VAT or duty rate that applies to the product to be exported. Goods cannot be exported or imported without these HS codes that can be found at the following link: https://www.adm.gov.it/portale/it/dogane/operatore/operatore-economico-autorizzato-aeo/conosci-aeo.

AEO number of the sender

It is the acronym of Authorized Economic Operator and identifies a code, which is not mandatory for the purpose of carrying out customs procedures, which makes them them simpler and faster. For more information you can consult the website of the customs agency: https://www.adm.gov.it/portale/it/dogane/ recording/operator-economic-authorized-aeo/conosci-aeo.

HMRC number

For shipments worth up to and including 135 pounds, the UK administration has made it compulsory for the exporter to pay VAT. The exporting company regardless of the recipient (company and / or private) and the Incoterm of the shipment, must register online at the HMRC (Her Majesty’s Revenue and Customs) and choose the payment method and period. The registration, to be carried out only once, issues an identification number which must be inserted strictly in each invoice for an amount lower than 135 pounds.

For more details:

https://www.gov.uk/government/collections/import-vat-on-parcels 

https://www.gov.uk/guidance/register-for-import-vat-on-parcels-you-sell-to-uk-buyers