If the total tax shown due on your 2021 N.C. tax return minus tax credits and the amount paid through North Carolina income tax withholding is $1,000 or more, you may owe interest on the underpayment of estimated tax. To see if you owe interest, you should complete Form D-422, Underpayment of Estimated Tax by Individuals. Form D-422 is available on the Department’s website. Interest is not due if each payment equals 25 percent (25%) of the lesser of 90 percent (90%) (66 2/3 percent (66 2/3%) for farmers and fishermen) of the tax due on your current year’s return or 100 percent (100%) of the tax due on your previous year’s return.
