Sales and use taxes.

The Sales and Use Tax Law imposes a tax on the gross receipts from the sale in this state of, or the storage, use, or other consumption in this state of, tangible personal property. That law imposes the sales tax upon "retailers," and defines a "retailer engaged in business in this state" to include specified entities. Existing law also provides that every retailer engaged in business in this state and making sales of tangible personal property for storage, use, or other consumption in this state, that engages in specified activities in this state shall, at the time of sale or at the time the storage, use, or other consumption becomes taxable, collect the tax from the purchaser.