Do I need to file state tax return for foreign states?

suna54321suna54321 Posts: 2subscriber
edited September 2008 in Business Planning
My business is incorporated in all the 50 states. The mainly incorporated in IA.
I do my business on the web i.e. majority of the sales is on the web.
Now the question arises do I need to file state tax return in foreign state as well? Is there any tax benefit from foreign state?
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