As @macuser_22 mentioned , you cannot use TurboTax for preparing returns  as a business.  To provide tax preparation service for money, you need a PTIN ( from the IRS ) with zero representation rights or PTIN  with limited representation rights if you particiapte in the AFSP program. Also most states have some kind of requirements   for education and continuing education if you want to go into business for  yourself  doing  tax preparation work.  There are many companies that offer commercial tax preparation software including Intuit , the parent enitity of TurboTax. Suggest you visit IRS ( TaxPro tab ) and your state  departtment of revenue  -- there is a lot information out there.  If you need more specific suggestion, please  comment with your  resident state name, state you want to prepare  for and type of returns you intend to prepare ( indiavidual,  business, fiduciary, estate  etc. )