Yes, you would need to manually handle it. TurboTax does not support its calculation.
Per instructions,
Z: Income under a nonqualified deferred compensation plan that fails to satisfy section 409A. This amount is subject to an additional 20% tax plus interest (TurboTax does not support this calculation).
See instructions on how to report, click here: https://www.irs.gov/pub/irs-pdf/iw2w3.pdf , page 21
@Phoenixbt
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