RSS Feed/News Sales Tax for user upgrades?

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Got this from Stripe:

Based on your recent Stripe transactions, you may have exceeded a tax threshold. You might need to start collecting tax through a solution like Stripe Tax.
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Do I need to charge sales tax or VAT for user upgrades? I'm based in the US. Can anyone recommend any good resources on where to look into this as to when a sales tax or VAT is required?

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