You said — Online monitoring and recording is the only conceivable way to enforce this.
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I don’t get that. From what I’ve seen *in practice* thus far, is that the sales taxes are *enforced* one of two ways. One way is the shipping address. One pays the appropriate sales taxes for the shipping address given.
For other kinds of purchases, one is charged sales tax for the zip code of the credit card given.
It’s that simple. Nothing more is needed — and in fact — this is exactly what has been done thus far. I should know, as I’ve run into this exact situation on both instances I just mentioned...
Not really, since the retailers will have your zip code for mailing they will just charge the applicable rate for your zip code. Alternatively, they may charge the same rate (
the average of all sales taxes nationwide)for everyone. Some states would gain under that idea (those with low rates) while high rate states would lose.