Sales Tax for user upgrades?

[cdub]

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.
Click to expand...

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?
Sales Tax for user upgrades?

free plugins
minecraft paid for free
mcmarket
mc-market
free minecraft paid plugins
free minecraft plugins
spigotmc
SpigotMC
aac free
ewg free
Minecraft Premium Plugins
ewg free download
litebans free
epicworldgenerator free
free schematics
leaked schematics minecraft
schematics
schematics leaked
schematics free
minecraft schematics free
paid minecraft schematics free
paid minecraft schematics for free
free cracked plugins
free cracked minecraft plugins
plugins
featherboard download
featherboard plugin download
antiaura download
xenforo leaked
xenforo for free
xenforo addons