Notice code 05 — Fraud - The penalty is 75% of the tax you didn’t pay due to fraud (50% of the tax you didn’t pay due…

Fraud - The penalty is 75% of the tax you didn’t pay due to fraud (50% of the tax you didn’t pay due to fraud on returns required to be filed before 1/1/87, not including extensions. For tax you didn’t pay due to fraud on returns required to be filed before 1/1/89, the penalty includes an additional 50% of the interest charged on the part of your underpayment due to fraud. This additional interes…

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What the IRS language says

Fraud - The penalty is 75% of the tax you didn’t pay due to fraud (50% of the tax you didn’t pay due to fraud on returns required to be filed before 1/1/87, not including extensions. For tax you didn’t pay due to fraud on returns required to be filed before 1/1/89, the penalty includes an additional 50% of the interest charged on the part of your underpayment due to fraud. This additional interest charge is a penalty and cannot be deducted from your federal taxes.