Thanks for getting in touch. @eCommAccountant has provided a correct summary above, and they are correct in stating that you most likely will not need to collect sales tax in other states unless you are deemed to have a tax nexus in those states.
A tax nexus can be defined through physical circumstances, such as having a warehouse, office, or employees in a state. It can also be determined by economic factors such as making a certain amount of sales to customers in a given state, or by generating revenue from sales into a state that exceeds a threshold. For example, in Colorado, a business is deemed to have an economic nexus in the state if their gross revenue exceeds $100k p/a from sales made from customers in Colorado, or if 200 or more transactions are made in a year.
If you are deemed to have a tax nexus in another state, then you must register for sales tax with that state's tax authority so you can begin to collect and remit sales tax for the orders you're receiving from that state. Please bear in mind that it is always advisable to speak directly to a tax professional if you are unsure of your obligations.
I hope that has helped explain things but please let me know if there's anything else I can help with.
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