Illinois HB 4030: SEX-BASED TERMS ACT

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104TH GENERAL ASSEMBLY 
State of Illinois 
2025 and 2026
HB4030

Introduced 4/7/2025, by Rep. David Friess, Blaine Wilhour, Adam M. Niemerg, Jed Davis, Brad Halbrook, et al. 

SYNOPSIS AS INTRODUCED:

New Act

 Creates the Definitions of Sex-Based Terms Act. Defines, for purposes of State statutes and administrative rules, the meaning of the following terms: "boy", "father", "female", "girl", "male", "man", "mother", "sex", and "woman".

LRB104 12898 BDA 24397 b

A BILL FOR

HB4030LRB104 12898 BDA 24397 b

1 AN ACT concerning government.

2 Be it enacted by the People of the State of Illinois, 

3represented in the General Assembly:

4 Section 1. Short title. This Act may be cited as the 

5Definitions of Sex-Based Terms Act.

6 Section 5. Purpose; application; findings. 

7 (a) The purpose of this Act is to bring clarity, 

8certainty, and uniformity to the laws of the State regarding 

9sex discrimination, privacy, equality of the sexes, and 

10benefits or services specifically provided to males and to 

11females.

12 (b) This Act shall apply wherever the State or an 

13instrumentality of the State classifies people on the basis of 

14sex or otherwise defines people as being female or male, women 

15or men, girls or boys.

16 (c) The General Assembly finds that:

17 (1) males and females are legally equal, but they are 

18 not the same;

19 (2) males and females possess unique and immutable 

20 biological differences that manifest prior to birth and 

21 increase as they age and experience puberty;

22 (3) these unique and immutable biological differences 

23 mean that females and males are not similarly situated in 

HB4030- 2 -LRB104 12898 BDA 24397 b

1 all circumstances and are not interchangeable; and

2 (4) inconsist