While most nonprofit organizations are also tax-exempt, that doesn’t mean all your current vendors have the necessary documentation to make sure you don’t inadvertently get charged sales tax. One big change in how all this works is the June 21, 2018 U.S. Supreme Court decision in South Dakota v. Wayfair that now requires most remote sellers (think email marketing providers, web providers, etc.) to begin collecting sales tax in certain states.
It’s quite common for these types of providers to offer nonprofit discounts to organizations without requiring those groups to provide copies of their nonprofit and tax-expect status. However, the recent court decision means those providers will need users to deliver that documentation.
I published an article at ArtsHacker.com on this topic along with some resources on how to make sure you have the correct info etc.