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by a professional
4mos ago
from University of Pennsylvania
in New York, NY, USA
If you are "conducting business" in a state, you are supposed to qualify to do business there. Whether you are conducting business is not a bright line rule but things like maintaining an office, having employees or ongoing revenue in a state are typically viewed as clear evidence of business conduct.
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by a searcher
1mo ago
from Washington University in St. Louis
in New York, NY, USA
Yes, you will probably need to register a foreign entity in the state if you are physically located there or if any employees are. You will need an EIN number in the state for the state to identify you and know how to treat you from a taxation perspective.