Methods, systems, and apparatus for facilitating interactions between a taxpayer and a tax preparer. The system includes a taxpayer client device configured to provide a graphical user interface to a user for receiving and displaying data in a consistent manner. The system also includes a signature unit configured to receive taxpayer signature data from the taxpayer client device via the graphical user interface. The system also includes a document upload unit configured to receive tax document data from the taxpayer client device via the graphical user interface. The system also includes a secure messaging unit configured to facilitate securely exchanging messages between devices. The system also includes an E-File authorization unit configured to receive taxpayer E-File authorization data from the taxpayer client device via the graphical user interface. The system also includes a payment unit configured to receive payment data from the taxpayer client device via the graphical user interface.