The method that TurboTax uses and the changing business percentage is what is causing that result. It has always done it that way, although I am unsure if it is doing it correctly or not. If the method is correct, then the result in TurboTax is also correct.
Are you using the online version, or the CD/downloaded version? IF you are using the CD/downloaded version, there might be a way to change the method it uses to calculate depreciation. Let me know if you have the CD/downloaded version and want to change that method, and I'll try to walk you through it.
