As a sole proprietorship the Form 1040 Schedule C or Schedule C-EZ that you are required to file generally includes the owner's Social Security Number (SSN)
You will use your SSN rather than your Employer Identification Number (EIN). The EIN for a sole proprietorship is generally used to file and provide information statements (e.g 1099-MISC or W-2 etc.) The statements have separate filing requirements than your Form 1040 business returns and are treated as separate issues by the Internal Revenue Service.
