Customs require a number of reports to be sent to them regarding excise transactions. These reports are used to calculate the Customs Duty, Excise Duty and VAT that is payable. The reports are also used for checking the movement of excise goods. The reports are WI, W5D, W8 and the Accompanying Administrative Document (AAD).

The W1 provides a detailed breakdown for excise transactions in a period. W1s need to be sent to Customs on a monthly basis. The W5D provides a summary for alcohol excise transactions and is used to calculate the duties payable. W5Ds need to be sent to Customs every 15 days. A W8 is used to provide details of excise goods moving from one bonded warehouse to another, in the UK. The W8 accompanies the vehicle and a receipt is returned when the goods reach their destination. An AAD is the same as a W8 but is used for goods travelling to a bonded warehouse in another EU country.