Once must have certain income requirements, whether you are a sponsor or joint sponsor or a substitute sponsor as
Affidavit of support form. The main criteria household income is equal to or higher than 125% of the U.S. poverty level. The house hold size determined based on the you, your dependents, any relatives living with you, and the immigrants you are sponsoring.
If you serving in US Armed Forces, you are sponsoring is your spouse or child, your income only needs to equal 100% of the U.S. poverty level, One should use the
Form I-864 in order to petition.