This is Max from the Shopify Team.
For some more information on how charging taxes works within Shopify, I'd suggest checking out this doc for some more clarification.
Next, I'd check with a local tax expert or government authority about the amount of tax you should be collecting and from where. This can vary depending on where you are located and the product(s) that you sell. Many of the automations would not be charging taxes for customers out of state as a rule, but it really depends on your location vs. theirs!
Then, if you do need to make some exceptions for where taxes are charged, you can use this info to set up tax overrides and exemptions where necessary!
Have a look and let us know if you need any more information on certain examples or orders or regions where the rules you have in place are not reflecting the correct tax info! that, we can definitely dig into from a technical troubleshooting perspective.