According to everything I could find, the difference between “origin based” and “destination based” doesn’t have anything to do with collecting sales tax for a state where you don’t have a nexus. So for example, New York is a destination state. If you are located in Nassau County and ship or deliver something to me in NYC, you must collect the NYC tax rate- not the Nassau County rate. Pennsylvania is an origin state - if you are located in Philadelphia and ship or deliver something to Pittsburgh, you collect the Philadelphia rate.
The rules are confusing if you are a remote seller with a sales tax nexus in the state where delivery takes place - because “origin” states sometimes flip to “destination” states for remote sellers.
If you have no nexus in a state, you don’t everhave to collect sales tax for that state. But if I buy something in a NJ store ( say a washing machine) and they deliver it to me in NY using their own truck (rather than a common carrier) that may be enough to establish nexus. And apparently keeping stock in an Amazon warehouse is enough, too.
I mean, it’s *possible *your online shop has nexus in multiple states- but I kind of doubt it (unless you have some sort of “Fulfilled by Amazon type” deal) I think that maybe you misunderstood the whole “origin” vs “destination” thing and believe that as the seller you must collect the tax for a destination state where you have no nexus.
Check this out- Origin-Based and Destination-Based Sales Tax Rate - TaxJar
And it has links to a guide for each stat.