Ct 399 2026

1. Click ‘Get Form’ to open the CT-399 in the editor.
2. Begin with Part 1, where you will compute New York State depreciation modifications. Fill in your corporation's legal name and employer identification number at the top.
3. In Section A, list each item of depreciable property. For each item, provide a description and complete columns B through I, including details like date placed in service and cost basis.
4. Proceed to Section B for property qualified under IRC section 168(k)(2). Again, describe each item and fill out the necessary columns as instructed.
5. If applicable, move to Part 2 for disposition adjustments. Here, calculate differences between federal and New York State depreciation deductions for disposed properties.
6. Finally, summarize your adjustments in Part 3 by entering amounts from previous sections into the designated lines.

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