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California - Business Entity Identifying Number
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California has three identifying numbers for business returns:

  • The California Corporation Number (CCN) is an eight-digit number beginning with the letter "C." In TaxAct, enter the seven digits after the letter "C."
  • The Secretary of State (SOS) file number is a minimum of 7 digits long, a maximum of 12 digits long, and can only contain the numbers 0-9.
  • The LLC Temp Number is a nine-digit number.

Visit the California Secretary of State website to determine your entity's California ID number and type.