IL-4562: Special Depreciation (2025)
Illinois · Illinois DOR · Used for tax years 2025
Form IL-4562 calculates your Illinois special depreciation addition and depreciation subtraction based on federal depreciation allowances and Illinois depreciation adjustments. Attach it to your Illinois income tax return.
Who files this form
Form IL-4562 figures your Illinois special depreciation addition and subtraction. The 2025 form is for tax years ending on or after December 31, 2025.
The form directs you to attach it to Form IL-1120, IL-1120-ST, IL-1065, IL-1041, or IL-1040. The supplied text does not give complete rules for who must file it.
What you'll need
Have the following available, as applicable:
- Your name as shown on your return and your Social Security number (SSN) or federal employer identification number (FEIN).
- Your current federal Form 4562, including special depreciation allowances on Lines 14 and 25 and depreciation amounts for the bonus depreciation categories listed on IL-4562.
- For individuals, federal Form 2106 showing any special depreciation allowance claimed.
- In the last year of regular depreciation, current and prior-year Forms IL-4562 showing the Illinois depreciation additions and subtractions for each property.
- Information to calculate the federal depreciation you would have claimed without bonus depreciation, for Line 16.
The form says you must read the instructions before completing it. Those instructions were not supplied here.
How to file
Attach Form IL-4562 to your Form IL-1120, IL-1120-ST, IL-1065, IL-1041, or IL-1040.
Enter your identifying information in Step 1. Calculate your Illinois special depreciation addition in Step 2 and your Illinois depreciation subtraction in Step 3.
The form refers you to the instructions for the Illinois return lines where you must report these amounts. The supplied text does not provide a mailing address or e-file directions.
Common mistakes
- Do not complete the form without reading the instructions. The form specifically requires this.
- Do not use negative figures.
- Do not omit required information. The form warns that failure to provide it could result in a penalty.
Questions people ask
What amount goes on Line 1?
Enter the total special depreciation allowance claimed on your current federal Form 4562, Lines 14 and 25, for property acquired after September 10, 2001.
Is there a separate entry for individuals?
Yes. Line 2 is for individuals to enter the total special depreciation allowance claimed on federal Form 2106, Employee Business Expenses.
What happens in the last year of regular depreciation?
Line 3 asks for all Illinois depreciation subtractions claimed in Step 3 of this year's and prior-year Forms IL-4562 for each property. Line 18 asks for the prior-year Illinois special depreciation addition from Step 2, Line 1 plus Line 2, for each property. Both lines direct you to the instructions.
Where are the final addition and subtraction amounts?
Line 4 is your Illinois special depreciation addition. Line 19 is your Illinois depreciation subtraction for the year. The form directs you to the instructions to find where to report each amount on your Illinois return.