Use your ss# as that is probably how you are filing. Even without employees it is a good idea to operate a business under a FEIN rather than personal SS.  If you perform contract work or fall under licensing by your state you would need EIN

Resolution for 'business under issue: 'I dont have an EIN number but need to pay sub contractors with 1099 forms, how do I do this?' available: Yes.

The business under issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the business under issue yourself by looking for a resolution described in the article. If it is a complex business under issue or you are unable to solve the issue, you may contact us by clicking here or by using other business under support options.

For more information about resolving issues related to business under in Quickbooks/QBO or to get support for the issue 'I dont have an EIN number but need to pay sub contractors with 1099 forms, how do I do this?', click the link below: