I just got answers to these same questions last night.
If you file jointly, it's based on the primary filers SS number.
If you paid taxes, it depends on how you filed. When we did ours electronically with Turbo Tax, it actually asked us for our bank info for the pending stimulus check (which I hope means we get *something*), even though we had to pay. If you didn't use Turbo Tax and you never gave your direct deposit info, then it'll generate a paper check that gets mailed out to you. I don't think that paying electronically is enough info for it to refund electronically (but I'm not 100% sure about that).




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