Increasing to 2.25% the minimum rate a county shall impose on an individual's Maryland taxable income; requiring a county, with regard to any increase to its county income tax rate that is effective on or after January 1, 2022, to impose the increase on an income bracket basis; authorizing a county to request information from the Comptroller to assist in determining income brackets and income tax rates that are revenue-neutral for the county; applying the Act to all taxable years beginning after December 31, 2021; etc.