Captive consumption valuation under CAS-4 sets out cost of production principles for excisable goods and related cost sheet disclosure. Guidance is provided for determining the cost of production of excisable goods used for captive consumption under CAS-4, read with the Central Excise valuation rules. It states that captively consumed goods are valued at 110% of cost of production and sets out the cost components to be included, the treatment of related transactions, partly sold and partly captively consumed goods, free samples, capital goods used within the factory, and goods removed for test or trial, with reference to the relevant valuation rules and circulars. The note also explains the cost sheet, certification, and disclosure requirements.