Commodities Transaction Tax: levy on commodity derivative sales with collection by recognised associations and prescribed compliance. Commodities Transaction Tax is levied on sales of commodity derivatives (excluding agricultural commodities) with the value defined as the traded price; recognised associations must collect the tax from sellers, remit collections to the government by the prescribed monthly deadline, and furnish prescribed annual returns detailing taxable transactions, while Assessing Officers may require returns, permit revised returns before assessment, and assess tax subject to a two year limitation.