Consumer use tax is essentially the same as sales tax. It becomes due after a taxable purchase is made, when sales tax was not paid. The tax obligation is then passed onto the customer for the goods or services purchased.
In 2017, many states passed the use tax notification policy. This policy requires that out-of-state vendors (such as cleverbridge) who don't collect, tax inform customers that their purchases may be subject to use tax. Since you made a purchase through cleverbridge in 2017, we are required to send you this notification.