Assuming the client has a rental or rentals they are offering via the AIRBNB platform then it would follow that since the renters pay AIRBNB who, in turn, remit to the owners (your client), the income would be reportable.  The issue will be whether or not it is reported on taxes as rental (passive) income or misc income which is generally non-passive.  As I understand it the general rule of determining whether it is passive or non-passive income depends upon the amount of time the taxpayer spent on the activity and whether that the taxpayer "actively" participated in the rental activity - all of which will impact how the rental losses can be deducted.  That determination will need to be made by the taxpayer since AIRBNB (or any rental agency/platform) would not be able to make that determination.  Hope that helps somewhat.