One of the first things you need to figure out is whether you have
sales tax nexus in a particular state. Nexus means having a significant enough presence in a state that leads you to be liable to collect sales tax. You might establish nexus through physical means, like having a
warehouse, office, or employee, or economic thresholds that trigger nexus without a physical presence. For instance, according to
Illinois tax law, a business can create economic nexus when it has $100,000 in sales or 200 transactions in one year.