CT-399 PDF Details

Part 1 is the computation of New York State depreciation modifications when computing New York State taxable income.

Part 1: list only depreciable property that requires or is entitled to a depreciation modification when computing New York State taxable income.

Sections: Section A is ACRS/MACRS property. Section B is property qualified under IRC section 168(k)(2) for federal special depreciation.

Disposed property: if you have disposed of any property listed on this form in a prior year, complete Parts 2 and 3.

Part 3: summary of adjustments to New York State taxable income.

Investment tax credit: In this tax period, did you dispose of property for which the investment tax credit was previously claimed?

QuestionAnswer
Form NameCT-399
Form Length3 pages
Fillable?No
Fillable fields0
Avg. time to fill out9 min
Edition2025
Issuing agencyDepartment of Taxation and Finance
Matches the agency's fileYes, checked October 2, 2026
Other namesCT-399, CT399, CT 399, Form CT-399, Depreciation Adjustment Schedule
Official sourceCT-399 (Rev 2025), Department of Taxation and Finance