CARBURA is an association pursuant to the Swiss Civil Code to which natural or legal persons who import or wish to import liquid fuels and combustibles may be affiliated. The CARBURA articles of association stipulate the following conditions for membership as "Importer Stockholder":
- Natural or legal persons registered in Swiss customs territory and entered in the trade register.
- Regular annual import of at least 3,000 m³ of liquid fuels and combustibles. Deliveries from domestic refineries are considered the same as imports.
- Sufficient storage capacity for compulsory and commercial stocks.
- Concluding a compulsory stockpiling contract with the Federal Office for National Economic Supply or FONES.
Companies active as Common Stockholder for the oil industry as a whole or as Substitute Stockholder for an Importer Stockholder are also members of CARBURA.
Since 1 May 2019, initial distributors of domestically produced or processed liquid fuels and combustibles and their components (cf. annexe of the ordinance on the compulsory stockholding of liquid fuels and combustibles) are also subject to compulsory stockholding. The new regulation mainly affects domestic producers of bio fuels. If the above conditions are met, these companies become members of CARBURA too.