Why would a host have sole responsibility for a co-hosts tax? If she does as I suggested, the host is responsible for their tax and the co-host is responsible for theirs. @Debra300
As it says in Airbnb's T&Cs for co-hosts......
The Tax sections of the TOS and Payments Terms (including the provisions relating to Taxes, Occupancy Tax Collection and Remittance, Opt-in to Host Remittance of Taxes, and Miscellaneous Occupancy Tax Provisions) remain unchanged and apply to the Co-Host Service.
In addition, as a Co-Host, you understand and agree that you are solely responsible for complying with any and all applicable tax obligations that may apply to your activities as a Co-Host, and for determining your applicable Tax reporting requirements. You are also solely responsible for remitting to the relevant authority any Taxes included or received by you. Airbnb does not offer Tax-related advice.