Professional Tax Preparers (PTP) who wish to register themselves to perform work on behalf of their client must use WebFile for Business to register. Your WebFile for Business PTP registration is applicable to both WebFile for Business and WebFile for Income. Payroll Service Providers can file their clients' taxes in bulk and make payments on their behalf. Software Developer information for file format specifications, schemas, forms, health care information and more is available.
Also see Approved Software Developers and Transmitters.