- Massachusetts Department of Revenue
Boston — The law provides that for each tax year in which certain inflation-adjusted baseline revenue growth requirements are met, the income tax rate will be reduced by increments of 0.05 percentage points until the rate reaches 5%.
For more detailed information see:
Press Release - Income tax rate to drop to 5.05% on Jan. 1
Massachusetts Circular M: Income Tax Withholding Tables at 5.05% Effective January 1, 2019