I could be wrong, but I think many states require any "foreign" business to register, if they intend to do business in that state. Obviously for a dot com, the exact definition of "doing business" is a bit fuzzy (see Amazon.com and their battles over this issue). But it's something to look into and consider, at the least.
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Note that sometimes you will also have to register in your home state as a "foreign LLC" if you have created the LLC in another state.
I could be wrong, but I think many states require any "foreign" business to register, if they intend to do business in that state. Obviously for a dot com, the exact definition of "doing business" is a bit fuzzy (see Amazon.com and their battles over this issue). But it's something to look into and consider, at the least.
Yup.
Also, doing business in your home state is automatic. Working there = doing business there.
Filing an LLC in another state without actually doing business there is useless.