Get your taxes done using TurboTax

How do I go about filing for someone without an address?  He must get mail somehow ... use a family member or friend's address if possible.

 

And if you know how, looking up exactly which stimulus check he has not yet collected?  I would simply file for all of them ... first 2 on the 2020 return and the third on the 2021 return and the IRS will figure it out automatically.