The amount of income of a sponsor (and his spouse) which shall be deemed to be the unearned income of an alien for any year shall be determined as follows:

(A) The total yearly rate of earned and unearned income (as determined under section 1382a(a) of this title ) of such sponsor and such sponsor’s spouse (if such spouse is living with the sponsor) shall be determined for such year.

(B) The amount determined under subparagraph (A) shall be reduced by an amount equal to (i) the maximum amount of the Federal benefit under this subchapter for such year which would be payable to an eligible individual who has no other income and who does not have an eligible spouse (as determined under section 1382(b)(1) of this title ), plus (ii) one-half of the amount determined under clause (i) multiplied by the number of individuals who are dependents of such sponsor (or such sponsor’s spouse if such spouse is living with the sponsor), other than such alien and such alien’s spouse.

(C) The amount of income which shall be deemed to be unearned income of such alien shall be at a yearly rate equal to the amount determined under subparagraph (B). The period for determination of such amount shall be the same as the period for determination of benefits under section 1382(c) of this title .