Illinois passed a landmark AI law. It almost certainly does not apply to your business.

The law that got the headlines

On July 6, 2026, Governor Pritzker signed the Artificial Intelligence Safety Measures Act, SB 315, described in coverage as the most protective AI law in the country. It requires large frontier developers, meaning companies generating at least $500 million a year in revenue, to publish and annually update plans addressing catastrophic risks from their models, to report serious incidents to the state within 72 hours, or 24 hours where there is imminent risk of death or serious injury, and to submit to annual independent third-party audits.

"Catastrophic risk" is defined around incidents that could kill or seriously injure more than 50 people or cause more than $1 million in property damage. The obligations are phased in ahead of January 2028.

If you run an Illinois business, read that revenue threshold again. This law is about the handful of companies building frontier models. It is not about you, and it does not regulate businesses that merely use AI tools.

The law that does apply to you

The rule Illinois employers actually need to know took effect on January 1, 2026, with far less attention. HB 3773 amended the Illinois Human Rights Act, and it reaches any covered employer using artificial intelligence in employment decisions.

It does two things. First, it prohibits using AI in a way that has the effect of discriminating on the basis of a protected class in recruitment, hiring, promotion, renewal, selection for training or apprenticeship, discharge, discipline, tenure, or the terms and conditions of employment. It separately prohibits using zip code as a proxy for a protected class.

Second, and this is the part employers overlook, it requires notice. An employer using AI for any of those purposes must tell employees and applicants that it is doing so.

The definition of AI is broad. It covers machine-based systems that infer how to generate predictions, content, recommendations, or decisions, and it expressly includes generative AI. That is wide enough to capture resume screening tools, ranking and matching features inside an applicant tracking system, and interview analysis products, whether or not anyone at your company thinks of them as artificial intelligence.

What makes compliance awkward right now

The Illinois Department of Human Rights proposed rules and then withdrew them. The statutory obligations remain fully in force. What is unclear is the detail: what compliant notice looks like, when exactly it must be given, and in what form.

That is an uncomfortable position, since the duty is real and the guidance is not. The practical response is to be able to answer three questions in writing.

• What tools do we use, and do any of them infer or recommend? This usually requires asking your vendors directly rather than assuming. Many HR platforms added AI features without much announcement.
• Have we told applicants and employees? Absent guidance, clear and specific beats clever. A plain statement in the job posting and the application flow is more defensible than silence.
• Do we know whether the tool produces disparate outcomes? The statute reaches AI that has the effect of discriminating. Intent is not the test, and a vendor's assurance is not the same as your own data.

Why the distinction matters

Two opposite mistakes are circulating. Some businesses believe Illinois just imposed sweeping AI obligations on them and are bracing for something that does not apply. Others read that the new law targets only enormous developers and conclude Illinois has nothing for them, missing the amendment that has been in force since January.

The exposure is not in SB 315. It is in an anti-discrimination statute with an established enforcement mechanism, applied to hiring software many employers did not realize they were using.