In this section, “taxable income” has the meaning that federal law gives to it for purposes of the Internal Revenue Code. For purposes of § 16–404(b)(2) of this subtitle, the liability of a chargeable person for the cost of care of an individual with an intellectual disability shall be determined in accordance with either of the following schedules, at the option of the chargeable person. Schedule A Schedule Based on Gross Monthly Income Gross Monthly Income of Person                 Monthly Rate of Contribution Liable for Support At        Less         2 3 4 5 6 7 8 Least        Than        Dep. Dep. Dep. Dep. Dep. Dep. Dep. $ 500 –– 575        $16.00 $ ........ $ ........ $ ........ $ ........ $ ........ $ ........ ������575 –– 650         22.40 16.00 ........ ........ ........ ........ ........ ������650 –– 725         25.60 22.40 19.20 16.00 ........ ........ ........ ������725 –– 800         32.00 28.80 22.40 19.20 16.00 ........ ........ ������800 –– 875         35.20 32.00 28.80 25.60 22.40 16.00 ........ ������875 –– 950         43.20 39.20 35.20 32.00 25.60 22.40 19.20 ������950 –– 1025         56.00 49.60 43.20 35.20 32.00 28.80 25.60 ����1025 –– 1100         72.00 64.00 49.60 43.20 39.20 35.20 32.00 ����1100 –– 1175         88.00 72.00 64.00 56.00 49.60 43.20 35.20 ����1175 –– 1250         91.00 88.00 80.00 72.00 64.00 49.60 43.20 ����1250 –– 1325         94.00 94.00 91.00 88.00 72.00 64.00 56.00 ����1325 –– 1400         94.00 94.00 94.00 91.00 88.00 80.00 72.00 ����1400 –– 1475         94.00 94.00 94.00 94.00 94.00 91.00 88.00 ����1475 –– 1550         94.00 94.00 94.00 94.00 94.00 94.00 91.00 ����1550 and up         94.00 94.00 94.00 94.00 94.00 94.00 94.00 Schedule B Schedule Based on Taxable Income Under Federal Internal Revenue Code Annual Taxable Income of Person Liable for Support                 Monthly Rate of Contribution At least $4,000 but less than $5,000                      $16.00 At least $5,000 but less than $6,000                      ����22.40 At least $6,000 but less than $7,000                      ����28.80 At least $7,000 but less than $8,000                      ����35.20 At least $8,000 but less than $9,000                      ����43.20 At least $9,000 but less than $10,000                      ����56.00 At least $10,000 but less than $11,000                      ����72.00 At least $11,000 but less than $12,000                      ����88.00 At least $12,000                                   ����94.00 To establish the taxable income, the chargeable person shall provide either a copy of a federal income tax return or an affidavit as to the taxable income reported on that federal income tax return. Any modification of liability for charges based on a federal income tax return shall become effective as of July 1 in each calendar year. Within the time that the Secretary sets and on the forms that the Secretary provides, each chargeable person shall elect the schedule under which the chargeable person is to be billed. The election is effective as of the day that the individual with an intellectual disability first is admitted for service and remains in force until changed by the chargeable person. A change in the election is effective on July 1 after the date on which the Department is notified of the change. If a person fails to elect within the time that the Secretary sets, the Secretary shall determine which schedule is to apply. A person whose taxable income is less than $4,000 a year may not be charged any amount under this section. For purposes of this section, both parents of an individual with an intellectual disability shall be considered a single responsible relative.