I am not a tax lawyer but I think that companies that are remitting the tax but not actually collecting it are asking for trouble.

In a previous life I worked for a company that included a specific tax (not the sales tax) in the total price of an item because their systems could not break out this additional new tax. During a tax audit the examiner said. You show that you have paid the tax but where have you collected it. etc...etc... Penalties and fines came next and they lost on appeal.

TW