Intuit (the company that makes TurboTax) has
three tax software product lines for paid preparers: ProSeries, Lacerte, and
Intuit Tax Online. Here are links to their web sites.
For a new preparer just starting out, ProSeries Basic is probably the most suitable.
And to prepare more than five e-files, you will need to sign up with the IRS as an ERO - an Electronic Returns Originator. How to become an Authorized E-file Provider…..
FAQ for Tax Preparer Requirements
Do you need a PTIN (Preparer Tax Identification Number)?