(b) For each taxable year beginning on or after January 1, 1991, the Franchise Tax Board shall recompute the adjusted gross income specified in paragraph (3) of subdivision (c). Those computations shall be made as follows:

1. (1) The California Department of Industrial Relations shall transmit annually to the Franchise Tax Board the percentage change in the California Consumer Price Index as modified for rental equivalent home ownership for all items from June of the prior calendar year to June of the current calendar year, no later than August 1 of the current calendar year.
2. (2) The Franchise Tax Board shall add 100 percent to the percentage change figure which is furnished pursuant to paragraph (1) and divide the result by 100.
3. (3) The Franchise Tax Board shall multiply the amount for the immediately preceding taxable year for the adjusted gross income limitation specified in paragraph (3) of subdivision (c) by the inflation adjustment factor determined in paragraph (2), and round off the resulting product to the nearest one dollar ($1).

(c) “Qualified senior head of household” means an individual who meets all of the following:

1. (1) Attained the age of 65 before the close of the taxable year.
2. (2) Qualified as the head of household in accordance with Section 17042 for either of the two taxable years immediately preceding the taxable year by providing a household for a qualifying individual who died during either of the two taxable years immediately preceding the taxable year.
3. (3) Whose adjusted gross income for the taxable year does not exceed thirty-seven thousand five hundred dollars ($37,500).