As a small business owner who's business is 99% found and executed online, I cannot do this. I might as well close now. I'm immediately contemplating a disclaimer of some sort: "We are a Nevada based business wherein services are not taxed. If you live in a city, county, or state that requires services like you are purchasing from us to be taxed, please self-report it. If necessary, calculate and pay that extra amount to us and we will pass it along." Not perfect, probably not good enough. I'm no lawyer or accountant and don't have one qualified to address tax laws across the country. What a mess.
Used to be you had to have a physical presence. They consider internet to be a virtual presence. Catalog sales by mail go back over 150 years. This means that was always wrong or a bad decision
Calculating the amount of tax paid could be the easiest part, there will be hundreds of companies by tomorrow that offer the service. It will be an added cost though. However, paying tax out to each state, each having their own deadlines for when they need to be paid, could be a nightmare.