Ok, so I'm in the same situation. Using QB online for my S-corp and there is no online version of business so I need to purchase the desktop version. First and foremost, if the business desktop version is only compatible with the desktop version of QBs, then the online version of QBs should provide a desktop version for free that syncs with the online version. This is at a minimum. I specifically asked if QBs online would easily allow me to do my taxes and forms for S-Corp and they said yes - I specifically asked about integration ... and they said yes. Not very happy about this.
Franklt
