Sales tax is charged on all orders shipping to CO, CT, LA, MA, NV, NY, RI, and VT. If your order isn’t shipping to one of those states, then you won’t pay tax.
We are not obligated to, and do not, collect state-specific sales tax unless collection or reporting is required by law. Your purchase is subject to state use tax unless it is specifically exempt from taxation. Please note that the purchase is not exempt merely because it is made over the Internet or by other remote means. Your state may require that you file a sales/use tax return at the end of the year to report and pay use tax on those purchases that are not specifically exempt from taxation where sales tax was not charged on the invoice. Please see the website of your state’s tax authority for tax return forms and further information.
If you're tax-exempt, check out this article: https://support.uncommongoods.com/hc/en-us/articles/225246607-Tax-exempt