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My wife is an American citizen, she is petitioning for me, I am a Mexican national. Because she could not meet the income requirements she had to use her mom as a joint sponsor. USCIS is requiring to submit all supporting tax documentation (Form 1099 and Form 2555 for the non taxable income) for the most recent year.
I looked up Form 2555 on the IRS website, and I understood this Form is for those individuals who have foreign earned income.
The joint sponsor in question has never worked abroad and has never earned any foreign income whatsoever.