Illinois HB 4089: INC TX-ESTIMATED PAYMENTS

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104TH GENERAL ASSEMBLY 
State of Illinois 
2025 and 2026
HB4089

Introduced 10/15/2025, by Rep. Travis Weaver 

SYNOPSIS AS INTRODUCED:

35 ILCS 5/803 from Ch. 120, par. 8-803

 Amends the Illinois Income Tax Act. Provides that, for taxable years ending on or after December 31, 2026, eligible taxpayers that are not corporations are required to pay estimated tax if the amount payable as estimated tax can reasonably be expected to be more than $25,000 (currently, $1,000). Effective immediately.

LRB104 14481 HLH 27620 b

A BILL FOR

HB4089LRB104 14481 HLH 27620 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 Illinois Income Tax Act is amended by 

5changing Section 803 as follows:

6 (35 ILCS 5/803) (from Ch. 120, par. 8-803)

7 Sec. 803. Payment of estimated tax. 

8 (a) Every eligible taxpayer other than an estate, trust, 

9partnership, Subchapter S corporation or farmer is required to 

10pay estimated tax for the taxable year, in such amount and with 

11such forms as the Department shall prescribe, if the amount 

12payable as estimated tax can reasonably be expected to be more 

13than the estimated tax minimum amount. (i) $250 for taxable 

14years ending before December 31, 2001, $500 for taxable years 

15ending on or after December 31, 2001 and before December 31, 

162019, and $1,000 for taxable years ending on or after December 

1731, 2019, or (ii) $400 for corporations.

18 (b) Definitions. As used in this Section: Estimated tax 

19defined. The term "estimated

20 "Eligible taxpayer" means a taxpayer other than an estate, 

21trust, partnership, Subchapter S corporation, or farmer. 

22 "Estimated tax" means the excess of