Taxes and the sharing economy

I define the sharing economy broadly as including both sharing assets and one's time. Four characteristics:

1. Monetizing unused time and assets.
2. Using technology to match those with resources to those willing to pay for them.
3. Providing assets where temporary need exists (such as bike share).
4. Operating in the broadest space possible (including digital services provided to a global marketplace).

The tax issues are often answerable once the facts are pinned down. 

For some background including how to get the facts pinned down, please check out:

• Due diligence checklist
• Video on helping sharing economy clients

What do you find to be your biggest tax issue for sharing economy activity?