
Failure to obtain an EIN may block your business from filing taxes Applying by fax, write your fax number in bold on the top of your application. A Federal Employer Identification Number (FEIN) is not required for all business types. If you are a sole proprietor, single-member LLC with no employees. Are you going to be operating an LLC, corporation, nonprofit, To apply for an EIN online, head to the IRS website and fill out the application form.