There is a 20% tax on the amount you enter from IRS Form 1099-MISC, Box 12 Section 409A income. This amount will be included in the total of Schedule 2 (Form 1040) Additional Taxes, Line 8.
Note. Line 8 of Schedule 2 (Form 1040) may have items included from Other Taxes. When the form is printed, the total amount of Other Taxes will print to the left, and the text printed to the left of that amount will define the type of tax.
According to IRS Instructions for Form 1040 and 1040-SR, you should include in the total on Line 8 any additional tax on income you received from a nonqualified deferred compensation plan that fails to meet certain requirements. This income should be shown in Box 12 of Form W-2 Wage and Tax Statement with code "Z" or in Box 12 of Form 1099-MISC. The tax is 20% of the amount required to be included in income plus an interest amount determined under section 409A(a)(1)(B)(ii). See Section 409A(a)(1)(B) for details. Identify as "NQDC."
If you also have federal and/or state tax withholding reported, see Form 1099-MISC - Federal or State Withholding.
To view the Other Taxes - Supporting Details worksheet for Schedule 2 (Form 1040), Line 8:
Note. If you see a message indicating you have not paid your return fees, click the View/Pay your return fees link, which will direct you through the Paper Filing steps. Continue through the screens until you have processed the payment for your product fees and then repeat the steps to print.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.