When wheat is delivered and credited to the account of a grower who is purchasing mixed feeds and other commodities, such transactions are really sales of the wheat delivered. In these cases, the buyer must deduct the tax from the amount credited to the grower and remit to the Commission just as though the sale had been made for cash. On the other hand, if the grower delivers the wheat in exchange for other wheat and no sale of the wheat is involved, the tax should not be deducted.
Idaho Admin. Code r. 42.01.01.104