I can find no evidence that I can use either the desktop or the online version with only one purchase. Since I already own Premier desktop, I'm not going to double pay in order to get this one feature that's absent from the desktop version.
I prefer to keep all my tax documents under my control, on my local computer with my own security measures in place. Intuit has a good track record for security since the vulnerabilities that were discovered back in 2001 and 2007; nevertheless, I prefer managing my own security.
