Reducing from 4.75% to 4.5% the State income tax rate imposed on the Maryland taxable income of specified individuals with income between $3,001 and $100,000 and specified spouses filing a joint return or surviving spouses or heads of household with income between $3,001 and $150,000; reducing from 5% to 4.75% the State income tax rate imposed on the Maryland taxable income of specified spouses filing a joint return or surviving spouses or heads of household with income between $150,001 and $175,000; etc.