That would be reported on Form 4562, in line 10. If you used TurboTax in the previous year, the carryover should appear there automatically. Otherwise, you'll find an option in your business section to enter the section 179 carryover amount from the previous year. It may be on the screen that says Your (name of business) Business, under Final Details, choose Special Situations:


Then indicate you have unused section 179 expenses carrying over from 2023:

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