Notice code 01 — Delinquent Filing Penalty - A combined penalty has been added because your return was filed late and…

Delinquent Filing Penalty - A combined penalty has been added because your return was filed late and the tax was not paid when due. The penalty is figured at 5 percent of the unpaid tax for each month or part of the month the return was late. It cannot be more than 25 percent of the tax paid late. For income tax returns due after December 31, 1982, that are filed more than 60 days late, the penal…

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What the IRS language says

Delinquent Filing Penalty - A combined penalty has been added because your return was filed late and the tax was not paid when due. The penalty is figured at 5 percent of the unpaid tax for each month or part of the month the return was late. It cannot be more than 25 percent of the tax paid late. For income tax returns due after December 31, 1982, that are filed more than 60 days late, the penalty will not be less than $100 or 100 percent of the balance of tax due on your return, whichever is smaller.