(b) Qualified taxpayers who file as an individual, as a head of household, as a husband and wife who file a joint return, or as an individual entitled to file as a surviving spouse shall be entitled to a tax credit based on the following:
(1) If modified federal adjusted gross income is at or below the federal poverty guidelines based on family size, the credit shall be an amount equal to the amount of tax owed under this article by the qualified taxpayer;
(2) If modified federal adjusted gross income is greater than the federal poverty guidelines but does not exceed three hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be ninety percent of the amount of tax owed under this article by the qualified taxpayer;
(3) If modified federal adjusted gross income is greater than three hundred dollars above the federal poverty guidelines but does not exceed six hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be eighty percent of the amount of tax owed under this article by the qualified taxpayer;
(4) If modified federal adjusted gross income is greater than six hundred dollars above the federal poverty guidelines but does not exceed nine hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be seventy percent of the amount of tax owed under this article by the qualified taxpayer;
(5) If modified federal adjusted gross income is greater than nine hundred dollars above the federal poverty guidelines but does not exceed one thousand two hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be sixty percent of the amount of tax owed under this article by the qualified taxpayer;
(6) If modified federal adjusted gross income is greater than one thousand two hundred dollars above the federal poverty guidelines but does not exceed one thousand five hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be fifty percent of the amount of tax owed under this article by the qualified taxpayer;
(7) If modified federal adjusted gross income is greater than one thousand five hundred dollars above the federal poverty guidelines but does not exceed one thousand eight hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be forty percent of the amount of tax owed under this article by the qualified taxpayer;
(8) If modified federal adjusted gross income is greater than one thousand eight hundred dollars above the federal poverty guidelines but does not exceed two thousand one hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be thirty percent of the amount of tax owed under this article by the qualified taxpayer;
(9) If modified federal adjusted gross income is greater than two thousand one hundred dollars above the federal poverty guidelines but does not exceed two thousand four hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be twenty percent of the amount of tax owed under this article by the qualified taxpayer; or
(10) If modified federal adjusted gross income is greater than two thousand four hundred dollars above the federal poverty guidelines but does not exceed two thousand seven hundred dollars above the federal poverty guidelines based on family size, the amount of credit allowable shall be ten percent of the amount of tax owed under this article by the qualified taxpayer.
(c) Qualified taxpayers who are husband and wife and who file separate returns shall be entitled to a tax credit based on the following:
(1) If modified federal adjusted gross income is at or below fifty percent of the federal poverty guidelines based on family size, the credit shall be an amount equal to the amount of tax owed under this article by the qualified taxpayer;
(2) If modified federal adjusted gross income is greater than fifty percent of the federal poverty guidelines but does not exceed one hundred fifty dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit allowable shall be ninety percent of the amount of tax owed under this article by the qualified taxpayer;
(3) If modified federal adjusted gross income is greater than one hundred fifty dollars above fifty percent of the federal poverty guidelines but does not exceed three hundred dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit allowable shall be eighty percent of the amount of tax owed under this article by the qualified taxpayer; (4) If modified federal adjusted gross income is greater than three hundred dollars above fifty percent of the federal poverty guidelines but does not exceed four hundred fifty dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit allowable shall be seventy percent of the amount of tax owed under this article by the qualified taxpayer;
(5) If modified federal adjusted gross income is greater than four hundred fifty dollars above fifty percent of the federal poverty guidelines but does not exceed six hundred dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit allowable shall be sixty percent of the amount of tax owed under this article by the qualified taxpayer;
(6) If modified federal adjusted gross income is greater than six hundred dollars above fifty percent of the federal poverty guidelines but does not exceed seven hundred fifty dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit allowable shall be fifty percent of the amount of tax owed under this article by the qualified taxpayer;
(7) If modified federal adjusted gross income is greater than seven hundred fifty dollars above fifty percent of the federal poverty guidelines but does not exceed nine hundred dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit allowable shall be forty percent of the amount of tax owed under this article by the qualified taxpayer;
(8) If modified federal adjusted gross income is greater than nine hundred dollars above fifty percent of the federal poverty guidelines but does not exceed one thousand fifty dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit allowable shall be thirty percent of the amount of tax owed under this article by the qualified taxpayer;
(9) If modified federal adjusted gross income is greater than one thousand fifty dollars above fifty percent of the federal poverty guidelines but does not exceed one thousand two hundred dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit allowable shall be twenty percent of the amount of tax owed under this article by the qualified taxpayer; or
(10) If modified federal adjusted gross income is greater than one thousand two hundred dollars above fifty percent of the federal poverty guidelines but does not exceed one thousand three hundred hundred fifty dollars above fifty percent of the federal poverty guidelines based on family size, the amount of credit shall be ten percent of the amount of tax owed under this article by the qualified taxpayer.
(d) The Tax Commissioner shall develop and publish on an annual basis two indexed tax credit tables. One tax table shall be for qualified taxpayers who file as an individual, as a head of household, as a husband and wife who file a joint return, or as an individual entitled to file as a surviving spouse and one tax table shall be for qualified taxpayers who are husband and wife and who file separate returns. The indexed tax credit tables shall be based on subsections (b) and (c) of this section.