104TH GENERAL ASSEMBLY
State of Illinois
2025 and 2026
SB4005
 
Introduced 2/6/2026, by Sen. Chapin Rose
 
SYNOPSIS AS INTRODUCED:
 
35 ILCS 200/10-610
35 ILCS 200/10-623 new
35 ILCS 200/10-725
35 ILCS 200/10-760
35 ILCS 200/10-765 new
    Amends the Property Tax Code. Provides that provisions concerning the valuation of commercial solar energy systems and wind energy devices apply only through taxable year 2026. Repeals those provisions on January 1, 2028. Effective immediately.


LRB104 17191 HLH 30610 b

 
 
A BILL FOR
 
SB4005LRB104 17191 HLH 30610 b

1    AN ACT concerning revenue.
 
2    Be it enacted by the People of the State of Illinois, 
3represented in the General Assembly:
 
4    Section 5. The Property Tax Code is amended by changing 
5Sections 10-610, 10-725, and 10-760 and by adding Sections 
610-765 and 10-623 as follows:
 
7    (35 ILCS 200/10-610)
8    Sec. 10-610. Applicability.
9    (a) The provisions of this Division apply for assessment 
10years 2007 through 2026 2035.
11    (b) The provisions of this Division do not apply to wind 
12energy devices that are owned by any person or entity that is 
13otherwise exempt from taxation under the Property Tax Code.
14(Source: P.A. 102-662, eff. 9-15-21.)
 
15    (35 ILCS 200/10-623 new)
16    Sec. 10-623. Repeal. This Division 18 of Article 10 is 
17repealed on January 1, 2028.
 
18    (35 ILCS 200/10-725)
19    Sec. 10-725. Improvement valuation of commercial solar 
20energy systems in counties with fewer than 3,000,000 
21inhabitants. Beginning in assessment year 2018 and continuing 
 
 
SB4005- 2 -LRB104 17191 HLH 30610 b

1through assessment year 2026, the fair cash value of 
2commercial solar energy system improvements in counties with 
3fewer than 3,000,000 inhabitants shall be determined by 
4subtracting the allowance for physical depreciation from the 
5trended real property cost basis. Functional obsolescence and 
6external obsolescence of the solar energy device may further 
7reduce the fair cash value of the commercial solar energy 
8system improvements, to the extent they are proved by the 
9taxpayer by clear and convincing evidence.
10(Source: P.A. 100-781, eff. 8-10-18.)
 
11    (35 ILCS 200/10-760)
12    Sec. 10-760. Applicability. The provisions of this 
13Division apply for assessment years 2018 through 2026 2033.
14(Source: P.A. 100-781, eff. 8-10-18.)
 
15    (35 ILCS 200/10-765 new)
16    Sec. 10-765. Repeal. This Division 20 of Article 10 is 
17repealed on January 1, 2028.
 
18    Section 99. Effective date. This Act takes effect upon 
19becoming law.