To find your California entity ID, search the California Secretary of State website. Type your entity name into the Business Search box and click "Search." Your entity ID number will be next to your name.
- If incorporated with the Secretary of State, check their website.
- Sole proprietorships and single-member LLCs may use Social Security numbers.
- The terms “corporate number” and “EIN” are interchangeable.
- Any business tax return shows your EIN number.
- A state tax ID serves the same purpose as a federal EIN.
- Your Entity ID or California Corporation Number is 7 or 12 digits.
- The 100S form requires both a "California corporation number" and a "Secretary of State file number".
- The SOS file number is 12 digits. If you give the 7-digit entity number instead, they can figure out the 12-digit number.
To find your California entity ID, search the California Secretary of State website. Type your entity name into the Business Search box and click "Search." Your entity ID number will be next to your name.