I had asked Birchbox about it when they told me I would start being taxed and they sent me:
"Sales tax will be charged for orders and subscriptions shipping to an address in a state in which we operate. Currently, sales tax is charged when shipping to New York, New Jersey, Massachusetts, Tennessee, Virginia, Washington and California."
When they started operating in California I had to pay sales tax. It depends on the state. Same with Amazon, I pay sales tax.
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