Although we’ve built a powerful tax calculation system for Square, Square cannot offer any tax advice or consultation services. Tax compliance is your responsibility. We do not guarantee the applicability or accuracy of our tax tools. If you have any questions about your tax obligations, consider consulting a professional tax advisor.
Also I believe your talking about the Online Store automatic tax calculation:
After setting up your tax registrations, you can use the automatic tax calculator. To automatically calculate US taxes for Square Online:
- From your Square Online Overview page, go to Settings > Sales Taxes or Shared Settings > Sales Taxes.
- Select Add tax rate.
- In the dropdown menu, select United States.
- Check Automatically calculate taxes.
- Select Save when finished.
Learn more about managing sales tax settings for Square Online. 