Whether or not you are required to collect sales tax on products you sell online boils down to a term called “nexus.”
If you run a business with a physical storefront, collecting sales tax is straightforward. You charge your customers the sales tax required by the state or county where your business is located. For example, if your retail store in located in Atlanta, Georgia, you are required to collect sales tax from customers purchasing items from your store.
But in your case, you sell your products online. Does that mean you charge customers the same sales taxes that you would to customers who purchase items from your brick and mortar store? It depends.
If your business has a physical presence in a state, such as a store, office or warehouse, you must collect applicable sales tax from your customers who you sell to online in those states. If you do not have a presence in a particular state, you are not required to collect sales taxes.
This physical presence is known as a "nexus." Each state defines nexus differently, but all agree that if you have a store or office of some sort, a nexus exists. If you are uncertain whether or not your business qualifies as a physical presence, contact your state's revenue agency. If you do not have a physical presence in a state, you are not required to collect sales taxes from customers in that state.
So if you or your partner has nexus in the states you live, you are required to collect and remit sales tax in that state.
Feel free to ask additional questions.