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Illinois Compiled Statutes

820 ILCS 405/237 (2026)

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(820 ILCS 405/237) (from Ch. 48, par. 347)
    Sec. 237. A. "Base period" means the first four of the last five completed calendar quarters immediately preceding the benefit year. Further, any wages which had previously been used to establish a valid claim pursuant to Section 242 and with respect to which benefits have been paid shall not be included in the base period provided for in this subsection.
    B. Notwithstanding subsection A, an individual, who has been awarded temporary total disability under any workers' compensation act or any occupational diseases act and does not qualify for the maximum weekly benefit amount under Section 401 because he was unemployed and awarded temporary total disability during the base period determined in accordance with subsection A, shall have his weekly benefit amount, if it is greater than the weekly benefit amount determined in accordance with subsection A, determined by the base period of a benefit year which began on the date of the beginning of the first week for which he was awarded temporary total disability under any workers' compensation act or occupational diseases act, provided, however, that such base period shall not begin more than one year prior to the individual's base period as determined under subsection A. Further, any wages which had previously been used to establish a valid claim pursuant to Section 242 and with respect to which benefits have been paid shall not be included in the base period provided for in this subsection.
    C. With respect to an individual who is ineligible to receive benefits under this Act by reason of the provisions of Section 500E during the base periods determined in accordance with subsections A and B, "base period" means the last 4 completed calendar quarters immediately preceding the benefit year. This subsection shall not apply to establish any benefit year beginning prior to January 1, 2008.
    D. Notwithstanding the foregoing provisions of this Section, "base period" means the base period as defined in the unemployment compensation law of any State under which benefits are payable to an individual on the basis of a combination of his wages pursuant to an arrangement described in Section 2700 F.
(Source: P.A. 93-634, eff. 1-1-04.)

    
Notes of Decisions
Cited in 10 cases (1 in the last 5 years), 2002–2024 · leading case: W. & S. Life Ins. v. Edmonson, 922 N.E.2d 1133 (Ill. App. Ct. 2009).
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W. & S. Life Ins. v. Edmonson, 922 N.E.2d 1133 (Ill. App. Ct. 2009). · cites it 2× “The term “base period” does not appear in section 228 and is actually defined in a later section in the Act (820 ILCS 405/237 (West 2006)). Therefore, we are reluctant to read such a specific time limitation into section 228 when it has been explicitly held that a court cannot…”
Rene Zambrano v. Jennifer Reinert, in Her Off. Capacity as Sec'y of the Wisconsin Dep't of Workforce Dev., 291 F.3d 964 (7th Cir. 2002). · cites it 2× “In that case, we addressed whether the definition of "base period" in section 237 of the Illinois Unemployment Insurance Act (the "IUIA"), 820 ILCS 405/237, violated the When Due Clause.”
Weinberg v. The Dep't of Emp. Sec., 2015 IL App (1st) 140490 (Ill. App. Ct. 2015). “820 ILCS 405/500(E) (West 2010); see also 820 ILCS 405/237(A) (West 2010) (defining “base period” as the first four of the last five completed calendar quarters that immediately precede the benefit year).”
Weinberg v. The Dep't of Emp. Sec., 2015 IL App (1st) 140490 (Ill. App. Ct. 2015). “820 ILCS 405/500(E) (West 2010); see also 820 ILCS 405/237(A) (West 2010) (defining "base period" as the first four of the last five completed calendar quarters that immediately precede the benefit year).”
Morrow v. The Illinois Dep't of Emp. Sec., 2024 IL App (2d) 230194-U (Ill. App. Ct. 2024). · cites it 2× “See 820 ILCS 405/237 (West 2020). Plaintiff did not earn any wages during the base period and a letter declaring her ineligible was sent to her address on December 7, 2020.”
W. & S. Life Ins. Co. v. Edmonson (Ill. App. Ct. 2009). · cites it 2× “The term “base period” does not appear in section 228 and is actually defined in a later section in the Act (820 ILCS 405/237 (West 2006)). Therefore, we are reluctant to read such a specific time limitation into section 228 when it has been explicitly held that a court cannot…”
Martin v. Dep't of Emp. Sec., 877 N.E.2d 1119 (Ill. App. Ct. 2007). “820 ILCS 405/237(A), 401 (West 2004). The “base-period employer” is the employer who pays wages to the claimant during this eligibility period.”
Lyte v. Deptartment of Emp. Sec., 937 N.E.2d 1197 (Ill. App. Ct. 2010). “” 820 ILCS 405/237(A) (West 2008). “Calendar quarter” is the three-consecutive-month period ending March 31, June 30, September 30, or December 31 (820 ILCS 405/ 238 (West 2008)) and “benefit year” is the one-year period beginning with the first day of the week with respect to…”
Zambrano, Rene v. Reinert, Jennifer (7th Cir. 2002). “In that case, we addressed whether the definition of "base period" in section 237 of the Illinois Unemployment Insurance Act (the "IUIA"), 820 ILCS 405/237, violated the When Due Clause.”
Lyte v. Dep't of Emp. Sec. (Ill. App. Ct. 2010). “" 820 ILCS 405/237(A) (West 2008). "Calendar quarter" is the three-consecutive-month period ending March 31, June 30, September 30, or December 31 (820 ILCS 405/238 (West 2008)) and "benefit year" is the one-year period beginning with the first day of the week with respect to…”
— 820 ILCS 405/237(A) — 8 cases
W. & S. Life Ins. v. Edmonson, 922 N.E.2d 1133 (Ill. App. Ct. 2009). “The term “base period” does not appear in section 228 and is actually defined in a later section in the Act (820 ILCS 405/237 (West 2006)). Therefore, we are reluctant to read such a specific time limitation into section 228 when it has been explicitly held that a court cannot…”
Weinberg v. The Dep't of Emp. Sec., 2015 IL App (1st) 140490 (Ill. App. Ct. 2015). “820 ILCS 405/500(E) (West 2010); see also 820 ILCS 405/237(A) (West 2010) (defining “base period” as the first four of the last five completed calendar quarters that immediately precede the benefit year).”
Weinberg v. The Dep't of Emp. Sec., 2015 IL App (1st) 140490 (Ill. App. Ct. 2015). “820 ILCS 405/500(E) (West 2010); see also 820 ILCS 405/237(A) (West 2010) (defining "base period" as the first four of the last five completed calendar quarters that immediately precede the benefit year).”
Morrow v. The Illinois Dep't of Emp. Sec., 2024 IL App (2d) 230194-U (Ill. App. Ct. 2024). “See 820 ILCS 405/237 (West 2020). Plaintiff did not earn any wages during the base period and a letter declaring her ineligible was sent to her address on December 7, 2020.”
Martin v. Dep't of Emp. Sec., 877 N.E.2d 1119 (Ill. App. Ct. 2007). “820 ILCS 405/237(A), 401 (West 2004). The “base-period employer” is the employer who pays wages to the claimant during this eligibility period.”
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