(a) The dwelling or non-housekeeping accommodations without board in a company project shall be available for persons or families of low income whose probable aggregate annual income at the time of admission and during the period of occupancy does not exceed, the greater of (i) the median income for such persons or families for the metropolitan statistical area in which the project is located, or if a project is located outside a metropolitan statistical area, the median income for such persons or families for the county in which the project is located, as most recently determined by the United States department of housing and urban development, in which case any person or family becoming eligible for admission pursuant to this subparagraph shall pay, from the time of admission, a rental surcharge as provided for in subdivision three of this section, computed on the basis of the income limitations applicable to such persons or families in the absence of this subparagraph, or (ii) eight times the rental, including the value or cost to them of heat, light, water and cooking fuel, of the dwellings that may be furnished to such persons or families, except that in the case of families with three or more dependents, such ratio shall not exceed nine to one. Persons or families with two or less dependents eligible for admission or continued occupancy pursuant to subparagraph (ii) of this paragraph or subparagraph (ii) of this paragraph prior to the effective date of a chapter of the laws of two thousand nineteen that amended subparagraph (ii) of this paragraph, shall pay a rental surcharge computed on the basis of an income limitation of seven times the rental and families with three or more dependents eligible for admission or continued occupancy pursuant to subparagraph (ii) of this paragraph or subparagraph (ii) of this paragraph prior to the effective date of a chapter of the laws of two thousand nineteen that amended subparagraph (ii) of this paragraph, shall pay a rental surcharge computed on the basis of an income limitation of eight times the cost of the rental, including in each instance the value or cost to the persons or families of heat, light, water and cooking fuel, of the dwellings furnished to such persons or families. The "probable aggregate annual income" in the case of dwelling accommodations means the annual income of the chief wage earner of the family, plus all other income of other members of the family over the age of twenty-one years, plus a proportion of income of gainfully employed members under the age of twenty-one years, the proportion to be determined by the company as approved by the commissioner or the supervising agency, as the case may be, excluding therefrom a deduction of fifteen thousand dollars from the income of secondary wage earners of the family or a larger deduction if approved by the commissioner or the supervising agency, as the case may be, except that the company, as approved by the commissioner or the supervising agency, as the case may be, may exclude a proportion of the income of other members of the family over the age of twenty-one years for the purpose of determining eligibility for admission or continued occupancy, or for establishing the rental of such family, or for all such purposes; in the case of such non-housekeeping accommodations it means the annual income of the occupant, provided that the commissioner or supervising agency, as the case may be, may make rules and regulations relative to the allocation of the income of a family among the members thereof for the purpose of determining the income attributable to such occupant.