Joint sponsor's required documents

[hdoubls]

Hello everybody,
I'm a green card holder since 2014, I applied for a F2A visa for my spouse, now the process reached the steps 4 (Collect financial documents) and 5 (Collect supporting documents).
Because I live temporally with my wife, I don't work in US, so I'm thinking to add a joint sponsor.
My question is, what documents do I need from my joint sponsor, do his latest W-2 and 1040 IRS tax return enough to prove that he can support me and my wife?
And what document do I need from my joint sponsor to prove if I meet the domicile requirement?
Thank's very much,
kind regards.

[newacct]

Hello everybody,
I'm a green card holder since 2014, I applied for a F2A visa for my spouse, now the process reached the steps 4 (Collect financial documents) and 5 (Collect supporting documents).
Because I live temporally with my wife, I don't work in US, so I'm thinking to add a joint sponsor.
My question is, what documents do I need from my joint sponsor, do his latest W-2 and 1040 IRS tax return enough to prove that he can support me and my wife?
And what document do I need from my joint sponsor to prove if I meet the domicile requirement?
Thank's very much,
kind regards.

The joint sponsor would need to fill out another I-864, and provide whatever the I-864 requires. They need to attach the last 1 year of tax returns (or tax return transcript). They also need to evidence of US citizenship or permanent residency as a joint sponsor. I don't think proof of domicile is necessary if their address is in the US.