What legislation covers this levy/export charge?

A legislative framework of imposition, collection and disbursement legislation authorises and supports Australia's primary industries levies system.

These are the relevant legislative instruments:

Primary Industries (Custom) Charges Act 1999
Primary Industries (Custom) Charges Regulations 2000
Primary Industries Levies and Charges Collection Act 1991
Primary Industries Levies and Charges Collection Regulations 1991

Note that we collect the Wine Export Charge pursuant to a collection agreement entered into under section 11 of the Primary Industries Levies and Charges Collection Act 1991.