399 form 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 details such as description, date placed in service, cost basis, and applicable depreciation methods. Ensure all columns from B to I are completed accurately.
4. Proceed to Section B for property qualified under IRC section 168(k)(2). Repeat the process of listing items and filling out the required fields as instructed.
5. If applicable, complete Part 2 for disposition adjustments by determining differences between federal and New York State depreciation deductions for each property listed.
6. Finally, summarize your adjustments in Part 3 by entering amounts from previous sections into the designated lines.

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