http://www.sos.ca.gov/business/tax.htm

Corp Taxes
http://www.ftb.ca.gov/ businesses/ bus_structures/ cCorp.shtml

Corp Tax Forms
http://www.ftb.ca.gov/ forms/07_forms/ 07_100toc.shtml

LLC Taxes
http://www.ftb.ca.gov/ businesses/ bus_structures/ LLcompany.shtml

LLC Tax Forms
http://www.ftb.ca.gov/ forms/ 07_forms/ 07_568toc.shtml

separate forms for each one. Many people delegate this work to a corporate attorney or a firm that specializes in the registering of corporations.
Private firms that will assist you in registering your entities in California
http://www.sos.ca.gov/ business/ bpd_service_companies.htm

If you are not registered in a state, you may not have the right to sue, which can limit your ability to collect debts and pursue your rights as a business. And that’s why you should know about Tax General Information.

If the state in which you do business requires out-of-state companies to register as foreign corporations and you neglect to do so, you may have to pay weighty penalties and you should be aware of LLC Tax Filing Rules.

If you are doing business in your home state and you have not qualified as a foreign shelf corporation in that state, you may be unable to pursue legal rights until you qualify. By that time, the statute of limitations may have run out.

Don’t be daunted by the foreign filing process. As with becoming incorporated, it’s simply a matter of correctly filling out the appropriate forms and paying the filing fees.