ILCS » Chapter 5 · Act 315
Illinois Compiled Statutes

5 ILCS 315/15 (2026)

Act takes precedence

✓ current as of May 2026
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(5 ILCS 315/15) (from Ch. 48, par. 1615)
    (Text of Section before amendment by P.A. 104-457)
    Sec. 15. Act takes precedence.
    (a) In case of any conflict between the provisions of this Act and any other law (other than Section 5 of the State Employees Group Insurance Act of 1971 and other than the changes made to the Illinois Pension Code by Public Act 96-889), executive order or administrative regulation relating to wages, hours and conditions of employment and employment relations, the provisions of this Act or any collective bargaining agreement negotiated thereunder shall prevail and control. Nothing in this Act shall be construed to replace or diminish the rights of employees established by Sections 28 and 28a of the Metropolitan Transit Authority Act, Sections 2.15 through 2.19 of the Regional Transportation Authority Act. The provisions of this Act are subject to Section 5 of the State Employees Group Insurance Act of 1971. Nothing in this Act shall be construed to replace the necessity of complaints against a sworn peace officer, as defined in Section 2(a) of the Uniform Peace Officers' Disciplinary Act, from having a complaint supported by a sworn affidavit.
    (b) Except as provided in subsection (a) above, any collective bargaining contract between a public employer and a labor organization executed pursuant to this Act shall supersede any contrary statutes, charters, ordinances, rules or regulations relating to wages, hours and conditions of employment and employment relations adopted by the public employer or its agents. Any collective bargaining agreement entered into prior to the effective date of this Act shall remain in full force during its duration.
    (c) It is the public policy of this State, pursuant to paragraphs (h) and (i) of Section 6 of Article VII of the Illinois Constitution, that the provisions of this Act are the exclusive exercise by the State of powers and functions which might otherwise be exercised by home rule units. Such powers and functions may not be exercised concurrently, either directly or indirectly, by any unit of local government, including any home rule unit, except as otherwise authorized by this Act.
(Source: P.A. 104-417, eff. 8-15-25.)
 
    (Text of Section after amendment by P.A. 104-457)
    Sec. 15. Act takes precedence.
    (a) In case of any conflict between the provisions of this Act and any other law (other than Section 5 of the State Employees Group Insurance Act of 1971 and other than the changes made to the Illinois Pension Code by Public Act 96-889), executive order or administrative regulation relating to wages, hours and conditions of employment and employment relations, the provisions of this Act or any collective bargaining agreement negotiated thereunder shall prevail and control. Nothing in this Act shall be construed to replace or diminish the rights of employees established by Sections 28 and 28a of the Chicago Transit Authority Act, Sections 2.15 through 2.19 of the Northern Illinois Transit Authority Act. The provisions of this Act are subject to Section 5 of the State Employees Group Insurance Act of 1971. Nothing in this Act shall be construed to replace the necessity of complaints against a sworn peace officer, as defined in Section 2(a) of the Uniform Peace Officers' Disciplinary Act, from having a complaint supported by a sworn affidavit.
    (b) Except as provided in subsection (a) above, any collective bargaining contract between a public employer and a labor organization executed pursuant to this Act shall supersede any contrary statutes, charters, ordinances, rules or regulations relating to wages, hours and conditions of employment and employment relations adopted by the public employer or its agents. Any collective bargaining agreement entered into prior to the effective date of this Act shall remain in full force during its duration.
    (c) It is the public policy of this State, pursuant to paragraphs (h) and (i) of Section 6 of Article VII of the Illinois Constitution, that the provisions of this Act are the exclusive exercise by the State of powers and functions which might otherwise be exercised by home rule units. Such powers and functions may not be exercised concurrently, either directly or indirectly, by any unit of local government, including any home rule unit, except as otherwise authorized by this Act.
(Source: P.A. 104-417, eff. 8-15-25; 104-457, Article 10, Section 10-15, eff. 6-1-26; 104-457, Article 15, Section 15-15, eff. 6-1-26.)

    
Notes of Decisions
Cited in 24 cases (4 in the last 5 years), 1996–2025 · leading case: City of Chicago v. Fraternal Order of Police, Chicago Lodge No. 7, 2020 IL 124831 (Ill. 2020).
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City of Chicago v. Fraternal Order of Police, Chicago Lodge No. 7, 2020 IL 124831 (Ill. 2020). · cites it 4× “See 5 ILCS 315/15 (West 2016). I believe that these two important public policies can coexist harmoniously, and the arbitrator’s decision may be construed so as not to create a conflict between these public policies.”
Am. Fed'n of State, Cnty. & Mun. Employees v. Dep't of Cent. Mgmt. Servs., 671 N.E.2d 668 (Ill. 1996). · cites it 2× “collectively (5 ILCS 315/6, 315/7 (West 1994)) and that, with certain exceptions not relevant here, "any collective bargaining contract *** executed pursuant to th[e] Act shall supersede any contrary statutes, charters, ordinances, rules or regulations relating to wages, hours…”
Brownlee v. City of Chicago, 983 F. Supp. 776 (N.D. Ill. 1997). · cites it 3× “Because Illinois law declares that a collective bargaining agreement supersedes any contrary statutes, ordinances, rules, or regulations relating to conditions of employment, see Illinois Public Labor Relations Act, 5 ILCS 315/15(b) (1993), the City argues that this conflict…”
Decatur Police Benevolent & Prot. Ass'n Labor Comm. v. City of Decatur, 2012 IL App (4th) 110764 (Ill. App. Ct. 2012). “” 5 ILCS 315/15(a) (West 2008). ¶ 29 The Union relies on section 15 as establishing “[t]he domestic[-]violence laws and the public policies in favor of ‘effective law enforcement’ have no place in this matter unless they relate to the conditions of employment for Officer Welker.”
Drnek v. City of Chicago, 192 F. Supp. 2d 835 (N.D. Ill. 2002). “” 5 ILCS 315/15(b). Under the CBA, the firefighter plaintiffs had a legally protected interest in continued employment, see Roman v.”
Grant v. Dimas, 2019 IL App (1st) 180799 (Ill. App. Ct. 2019). · cites it 2× “5 ILCS 315/15 (West 2016). Section 15(a) states, “[i]n case of any conflict between the provisions of this Act and any other law ***, the provisions of this Act or any collective bargaining agreement negotiated thereunder shall prevail and control.”
Park Superintendents' Prof'l Ass'n v. Ryan, 745 N.E.2d 618 (Ill. App. Ct. 2001). “5 ILCS 315/15(a) (West 1998). A finding that the Association is entitled to collective bargaining under section 9(7) of the Personnel Code would directly conflict with its preclusion from collective bargaining under the Illinois Public Labor Relations Act and would render the…”
Afl-Cio (Afscme) v. Dept. of Cent. Mgt., 671 N.E.2d 668 (Ill. 1996). “ollectively (5 ILCS 315/6, 315/7 (West 1994)) and that, with certain exceptions not relevant here, "any collective bargaining contract * * * executed pursuant to th[e] Act shall supersede any contrary statutes, charters, ordinances, rules or regulations relating to wages, hours…”
Mahoney v. City of Chicago, 687 N.E.2d 132 (Ill. App. Ct. 1997). “” 5 ILCS 315/15(a) (West 1996). Thus, the collective bargaining agreement preempts the personnel rules to the extent that they conflict with the collective bargaining agreement.”
Gantz v. McHenry Cnty. Sheriff'S Deptartment Merit Comm'n, 694 N.E.2d 1078 (Ill. App. Ct. 1998). “” 5 ILCS 315/ 15(a), (b) (West 1994). It is clear from this statutory language that, in disputes arising from CBAs, the ISLRB has jurisdiction over the subject claims.”
Int'l Union of Operating Engineers Local 965 v. The Illinois Labor Relations Bd., 2015 IL App (4th) 140352 (Ill. App. Ct. 2015). “See 5 ILCS 315/15(b) (West 2012) ("Any collective bargaining agreement entered into prior to the effective date of this Act shall remain in full force during its duration.”
Int'l Union of Operating Engineers Local 965 v.Illinois Labor Relations Bd., State Panel, 2015 IL App (4th) 140352 (Ill. App. Ct. 2015). “See 5 ILCS 315/15(b) (West 2012) (“Any collective bargaining agreement entered into prior to the effective date of this Act shall remain in full force during its duration.”
Show all 24 citing cases →
— 5 ILCS 315/15(a) — 12 cases
City of Chicago v. Fraternal Order of Police, Chicago Lodge No. 7, 2020 IL 124831 (Ill. 2020). “See 5 ILCS 315/15 (West 2016). I believe that these two important public policies can coexist harmoniously, and the arbitrator’s decision may be construed so as not to create a conflict between these public policies.”
Decatur Police Benevolent & Prot. Ass'n Labor Comm. v. City of Decatur, 2012 IL App (4th) 110764 (Ill. App. Ct. 2012). “” 5 ILCS 315/15(a) (West 2008). ¶ 29 The Union relies on section 15 as establishing “[t]he domestic[-]violence laws and the public policies in favor of ‘effective law enforcement’ have no place in this matter unless they relate to the conditions of employment for Officer Welker.”
Park Superintendents' Prof'l Ass'n v. Ryan, 745 N.E.2d 618 (Ill. App. Ct. 2001). “5 ILCS 315/15(a) (West 1998). A finding that the Association is entitled to collective bargaining under section 9(7) of the Personnel Code would directly conflict with its preclusion from collective bargaining under the Illinois Public Labor Relations Act and would render the…”
Mahoney v. City of Chicago, 687 N.E.2d 132 (Ill. App. Ct. 1997). “” 5 ILCS 315/15(a) (West 1996). Thus, the collective bargaining agreement preempts the personnel rules to the extent that they conflict with the collective bargaining agreement.”
Gantz v. McHenry Cnty. Sheriff'S Deptartment Merit Comm'n, 694 N.E.2d 1078 (Ill. App. Ct. 1998). “” 5 ILCS 315/ 15(a), (b) (West 1994). It is clear from this statutory language that, in disputes arising from CBAs, the ISLRB has jurisdiction over the subject claims.”
— 5 ILCS 315/15(b) — 9 cases
City of Chicago v. Fraternal Order of Police, Chicago Lodge No. 7, 2020 IL 124831 (Ill. 2020). “See 5 ILCS 315/15 (West 2016). I believe that these two important public policies can coexist harmoniously, and the arbitrator’s decision may be construed so as not to create a conflict between these public policies.”
Am. Fed'n of State, Cnty. & Mun. Employees v. Dep't of Cent. Mgmt. Servs., 671 N.E.2d 668 (Ill. 1996). “collectively (5 ILCS 315/6, 315/7 (West 1994)) and that, with certain exceptions not relevant here, "any collective bargaining contract *** executed pursuant to th[e] Act shall supersede any contrary statutes, charters, ordinances, rules or regulations relating to wages, hours…”
Brownlee v. City of Chicago, 983 F. Supp. 776 (N.D. Ill. 1997). “Because Illinois law declares that a collective bargaining agreement supersedes any contrary statutes, ordinances, rules, or regulations relating to conditions of employment, see Illinois Public Labor Relations Act, 5 ILCS 315/15(b) (1993), the City argues that this conflict…”
Drnek v. City of Chicago, 192 F. Supp. 2d 835 (N.D. Ill. 2002). “” 5 ILCS 315/15(b). Under the CBA, the firefighter plaintiffs had a legally protected interest in continued employment, see Roman v.”
Afl-Cio (Afscme) v. Dept. of Cent. Mgt., 671 N.E.2d 668 (Ill. 1996). “ollectively (5 ILCS 315/6, 315/7 (West 1994)) and that, with certain exceptions not relevant here, "any collective bargaining contract * * * executed pursuant to th[e] Act shall supersede any contrary statutes, charters, ordinances, rules or regulations relating to wages, hours…”
— 5 ILCS 315/15(c) — 1 case
Policeman's Benevolent & Prot. Ass'n of Illinois v. City of Chicago, 2023 IL App (1st) 220762-U (Ill. App. Ct. 2023).
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