Once you know the name you want is available, you can file the appropriate forms for your business structure with the CA Secretary of State. Corporation. If your business structure is a partnership, corporation, or limited liability (LLC), you must register or incorporate with the California Secretary of State.24-hour rush service available. File a Fictitious Business Name for Original, Amendment, Renewal, Abandonment and Withdrawal filings. Provide Proof of Publication. In addition, income tax rate may be higher than the corporate form of business organization. There are over half a million-business registered in Los Angeles. Follow these quick and easy steps to meet the requirements for starting a business in LA. The following filing tips are designed to help you meet the minimum filing requirements of the California Corporations Code.