body: Various online resources claim that **if you register a company in another state while living in California, then under California law, you have to also register the company in California as a "foreign" entity**, thus making the whole process cost twice as much and requiring you to pay twice as much in taxes, essentially making the whole approach useless.
  
  
  Is this true or false? Reliable government sources would be much appreciated, but I'll take any insight at this point, just to have some foundation for further research.
  
  
  
title: Do companies formed in other states require a separate registration in California?