HB4030, titled the Definitions of Sex-Based Terms Act, would create a new Illinois law establishing fixed definitions for a set of sex-based terms used in state statutes, administrative rules, and agency interpretations. The bill defines “boy,” “girl,” “man,” “woman,” “father,” “mother,” “male,” “female,” and “sex,” and states that these terms apply wherever the state classifies people on the basis of sex or uses sex-specific language. It also declares that sex means being male or female as observed or clinically verified at birth, that there are only two sexes for purposes of the act, and that “gender identity” is not a synonym or substitute for sex.
The bill’s stated purpose is to bring clarity, certainty, and uniformity to state law regarding sex discrimination, privacy, equality of the sexes, and sex-specific benefits or services. It includes legislative findings asserting that males and females are legally equal but biologically different, and that inconsistencies in court rulings and policy initiatives have endangered women’s rights, resources, and private single-sex spaces. The definitions are intended to guide interpretation of Illinois statutes and administrative rules whenever sex-based terms are used.
If enacted, HB4030 would affect how state agencies, courts, and other state instrumentalities interpret sex-based language across Illinois law. It would likely influence areas such as anti-discrimination policy, privacy rules, school and extracurricular participation, single-sex facilities, and any state programs or benefits that distinguish between males and females. The bill also expressly provides that individuals with intersex or disorders/differences in sex development are not a third sex, but must be accommodated consistent with state and federal law.
Because no committee transcripts or votes are provided, there is no recorded legislative debate or voting history in the materials. Based on the bill text alone, the measure appears strongly aligned with a sex-based or biological-sex definition framework and is likely to be viewed as controversial in debates over transgender rights, gender identity recognition, and access to sex-segregated spaces and services. The bill’s findings suggest its sponsors see it as a corrective to legal uncertainty, while opponents would likely object to its exclusion of gender identity and its potential effects on transgender and intersex people.
HB4030 would add a new statutory framework for interpreting sex-based terms in Illinois law and administrative rules, effectively directing state actors to use the bill’s definitions when applying or construing those terms. It would not merely define isolated words; it would establish a general interpretive rule for state statutes, regulations, and agency interpretations involving sex classification, with potential downstream effects on civil rights enforcement, education policy, privacy rules, and eligibility for sex-specific programs or facilities.
No committee testimony or vote record is included, so there is no direct evidence of legislative support or opposition in the provided materials. The bill text itself reflects a clear policy position favoring biological-sex definitions and expresses concern about legal uncertainty and the protection of women’s rights and single-sex spaces, suggesting the sponsor’s intent is affirmative and corrective. At the same time, the subject matter is inherently contentious and likely to draw opposition from those who support gender identity-based protections or who view the bill as restrictive toward transgender and intersex individuals.
The main points of contention are the bill’s rejection of gender identity as a legal substitute for sex, its definition of sex as only male or female, and its treatment of intersex or differences in sex development as not constituting a third sex. Supporters are likely to argue that the bill restores clarity, consistency, and protection for women’s rights and single-sex spaces. Opponents are likely to argue that it could undermine transgender recognition, complicate anti-discrimination protections, and create conflicts with existing state or federal accommodations for intersex and transgender people.