Line 24 Section 179 expense deduction disallowed appears on the Federal Carryover Worksheet. When you see a SmartCheck message about this amount, you should also see the worksheet displayed so you can enter the corrected value.
Using Forms Mode in TurboTax for Desktop, you can open this form and right-click on the 2021 box of Line 24. Choose Data Source and TurboTax will list all forms that report Sec 179 Expense and carryovers. You can either revise the number on the included forms or right-click and choose Override. As long as your entry doesn't turn red, your entry has been accepted.
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