---
title: "What is the Illinois BAC limit for a standard driver?"
description: "The Illinois legal BAC limit for a standard non-commercial driver over age 21 is 0.08 under 625 ILCS 5/11-501(a)(1). At 0.08 or above, the state can secure a DUI conviction based on the number alone,..."
url: https://chicagoduilawyer.net/faq-items/what-is-the-illinois-bac-limit-for-a-standard-driver/
date: 2026-07-08
modified: 2026-07-08
author: "Chicago DUI Lawyer"
type: faq
lang: en
---

# What is the Illinois BAC limit for a standard driver?

The Illinois legal BAC limit for a standard non-commercial driver over age 21 is **0.08** under 625 ILCS 5/11-501(a)(1). At 0.08 or above, the state can secure a DUI conviction based on the number alone, without proving actual impairment. Commercial drivers face a lower limit of **0.04** under 625 ILCS 5/6-515. Drivers under 21 are subject to **zero tolerance** under 625 ILCS 5/11-501.8, meaning any measurable alcohol (0.00 to 0.08) triggers license suspension even without a DUI conviction. Illinois also has a high-BAC enhancement at **0.16 or above**, which adds mandatory minimum jail or community service to a first-offense conviction. Refusal to submit to testing triggers a separate 12-month suspension.