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    <ReturnTs>2024-11-15T05:46:45-08:00</ReturnTs>
    <TaxPeriodEndDt>2023-12-31</TaxPeriodEndDt>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>366076571</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>ILLINOIS AUTOMOBILE INSURANCE PLAN</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>ILLI</BusinessNameControlTxt>
      <PhoneNum>4019462310</PhoneNum>
      <USAddress>
        <AddressLine1Txt>c/o AIPSO 302 CENTRAL AVENUE</AddressLine1Txt>
        <CityNm>JOHNSTON</CityNm>
        <StateAbbreviationCd>RI</StateAbbreviationCd>
        <ZIPCd>029194932</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Jennifer DeOliveira</PersonNm>
      <PersonTitleTxt>Manager, Financial &amp; Investment Ser</PersonTitleTxt>
      <PhoneNum>4019462310</PhoneNum>
      <SignatureDt>2024-10-23</SignatureDt>
    </BusinessOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>true</IRSResponsiblePrtyInfoCurrInd>
    <TaxYr>2023</TaxYr>
    <BuildTS>2024-10-15 13:58:12Z</BuildTS>
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      <WebsiteAddressTxt>www.aipso.com/il</WebsiteAddressTxt>
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      <ProgramServiceRevenueAmt>69485</ProgramServiceRevenueAmt>
      <MembershipDuesAmt>0</MembershipDuesAmt>
      <InvestmentIncomeAmt>12327</InvestmentIncomeAmt>
      <CostOrOtherBasisExpenseSaleAmt>0</CostOrOtherBasisExpenseSaleAmt>
      <GainOrLossFromSaleOfAssetsAmt>0</GainOrLossFromSaleOfAssetsAmt>
      <FundraisingGrossIncomeAmt>0</FundraisingGrossIncomeAmt>
      <SpecialEventsDirectExpensesAmt>0</SpecialEventsDirectExpensesAmt>
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      <CostOfGoodsSoldAmt>0</CostOfGoodsSoldAmt>
      <GrossProfitLossSlsOfInvntryAmt>0</GrossProfitLossSlsOfInvntryAmt>
      <OtherRevenueTotalAmt>447</OtherRevenueTotalAmt>
      <TotalRevenueAmt>82259</TotalRevenueAmt>
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      <OtherChangesInNetAssetsAmt>85921</OtherChangesInNetAssetsAmt>
      <NetAssetsOrFundBalancesEOYAmt>11451</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
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      <PrimaryExemptPurposeTxt>see note below</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>To make motor vehicle insurance available for persons notable to obtain coverage in the voluntary market.</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Travelers Indemnity Co</BusinessNameLine1Txt>
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      <OfficerDirectorTrusteeEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Progressive Cas Ins Co</BusinessNameLine1Txt>
        </BusinessName>
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      <OfficerDirectorTrusteeEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Country Cas Ins Co</BusinessNameLine1Txt>
        </BusinessName>
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        <AverageHrsPerWkDevotedToPosRt>0.10</AverageHrsPerWkDevotedToPosRt>
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      <OfficerDirectorTrusteeEmplGrp>
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          <BusinessNameLine1Txt>Amica Mutual Ins Co</BusinessNameLine1Txt>
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      <OfficerDirectorTrusteeEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>American Family Mut Ins Co</BusinessNameLine1Txt>
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          <BusinessNameLine1Txt>Nationwide Mut Ins Co</BusinessNameLine1Txt>
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        <PersonNm>Arachas GroupDanielle Harrison</PersonNm>
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        <PersonNm>John Brubaker</PersonNm>
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      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
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        <BusinessName>
          <BusinessNameLine1Txt>AIPSO</BusinessNameLine1Txt>
        </BusinessName>
        <USAddress>
          <AddressLine1Txt>302 CENTRAL AVENUE</AddressLine1Txt>
          <CityNm>JOHNSTON</CityNm>
          <StateAbbreviationCd>RI</StateAbbreviationCd>
          <ZIPCd>029194932</ZIPCd>
        </USAddress>
        <PhoneNum>4019462310</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
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      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 8</FormAndLineReferenceDesc>
        <ExplanationTxt>Late penalty fees 212.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 8</FormAndLineReferenceDesc>
        <ExplanationTxt>Bad debt recovery 235.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Losses incurred 47807.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Loss adjustment expenses incurred 11988.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Commissions 9542.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Travel 4465.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Corporate communications 3500.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Premium charge offs 886.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Underwriting reports 1267.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Bank charges 739.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Premium taxes 1615.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Licenses &amp; fees 592.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Miscellaneous 832.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 20</FormAndLineReferenceDesc>
        <ExplanationTxt>Assessments to member insurance companies 81269.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part I, Line 20</FormAndLineReferenceDesc>
        <ExplanationTxt>Plans share of decrease in pension benefit obligation 4652.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part II, Line 24</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounts Receivable net 267.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part II, Line 26</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounts Payable &amp; Accrued Expenses 36490. 19414.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part II, Line 26</FormAndLineReferenceDesc>
        <ExplanationTxt>Accrued Pension Expense 70828. 64046.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part II, Line 26</FormAndLineReferenceDesc>
        <ExplanationTxt>Reserves 80515. 111291.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990EZ, Part II, Line 26</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounts Payable-member companies 114642. 105609.</ExplanationTxt>
      </SupplementalInformationDetail>
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