For tax years beginning after December 31, 2015, the Arizona Department of Revenue must adjust the dollar amounts for each Arizona personal income tax rate bracket according to the average annual change in the Metropolitan Phoenix consumer price index published by the U.S. Bureau of Labor Statistics. The revised amounts must be raised to the nearest whole dollar and may not be revised below the amounts prescribed for the prior taxable year. (H.B. 2001, Laws 2015, effective as noted.)
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