﻿<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:sfsmef="http://www.cchsfs.com/efile/mef" returnVersion="2024v5.0">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2025-05-27T15:09:26-07:00</ReturnTs>
    <TaxPeriodEndDt>2024-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>831302748</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>Untaxers Ltd</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>29940 N IVES DR</AddressLine1Txt>
        <CityNm>MEADVIEW</CityNm>
        <StateAbbreviationCd>AZ</StateAbbreviationCd>
        <ZIPCd>86444</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2024-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>920564802</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>21ST CENTURY STEM</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>21ST</BusinessNameControlTxt>
      <USAddress>
        <AddressLine1Txt>16478 BEACH BLVD SUITE 122</AddressLine1Txt>
        <CityNm>WESTMINSTER</CityNm>
        <StateAbbreviationCd>CA</StateAbbreviationCd>
        <ZIPCd>92683</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>DENISE PEOPLES</PersonNm>
      <PersonTitleTxt>EXECUTIVE DIRECTOR</PersonTitleTxt>
      <PhoneNum>9512832503</PhoneNum>
      <SignatureDt>2025-05-13</SignatureDt>
      <DiscussWithPaidPreparerInd>true</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>true</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>Penelopy Jordan</PreparerPersonNm>
      <PTIN>P02257635</PTIN>
      <PhoneNum>2132057007</PhoneNum>
      <PreparationDt>2025-05-13</PreparationDt>
    </PreparerPersonGrp>
    <TaxYr>2024</TaxYr>
    <BuildTS>2025-03-06 01:10:19Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="4">
    <IRS990EZ documentId="2" softwareId="24020071" referenceDocumentId="3">
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <WebsiteAddressTxt>www.21stcenturystem.org</WebsiteAddressTxt>
      <Organization501c3Ind referenceDocumentId="1">X</Organization501c3Ind>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>57245</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>57245</ContributionsGiftsGrantsEtcAmt>
      <TotalRevenueAmt>57245</TotalRevenueAmt>
      <OtherExpensesTotalAmt>31441</OtherExpensesTotalAmt>
      <TotalExpensesAmt>31441</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>25804</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>18939</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>44743</NetAssetsOrFundBalancesEOYAmt>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>18939</BOYAmt>
        <EOYAmt>34810</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <Form990TotalAssetsGrp>
        <BOYAmt>18939</BOYAmt>
        <EOYAmt>34810</EOYAmt>
      </Form990TotalAssetsGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>18939</BOYAmt>
        <EOYAmt>34810</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <PrimaryExemptPurposeTxt>HEALING &amp; STEM EDUCATION</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>SIGNATURE MATH ACCELERATION PROGRAM OR MAP AND MASTER STUDENT PROGRAM OR MSP</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>COACHING FOR FACILITATORS OF INSTRUCTION AKA TEACHERS</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>FINANCIAL LITERACY LEARNING PROGRAMS NOW AVAILABE AND INFUSED INTO THE STANDARD MATHMATICS CURRICULA</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>OTHER PROGRAM SERVICES</DescriptionProgramSrvcAccomTxt>
        <ProgramServiceExpensesAmt>4108</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <TotalProgramServiceExpensesAmt>4108</TotalProgramServiceExpensesAmt>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>DENISE PEOPLES</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>20</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>TRACY BENNETT</PersonNm>
        <TitleTxt>SECRETARY</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>10</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>DENISE PEOPLES</PersonNm>
        <TitleTxt>TREASURER</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>20</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>false</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
      <MadeLoansToFromOfficersInd>false</MadeLoansToFromOfficersInd>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <StatesWhereCopyOfReturnIsFldCd>CA</StatesWhereCopyOfReturnIsFldCd>
      <BooksInCareOfDetail>
        <PersonNm>DENISE PEOPLES</PersonNm>
        <USAddress>
          <AddressLine1Txt>16478 BEACH BLVD SUITE 12</AddressLine1Txt>
          <CityNm>WESTMINSTER</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>92683</ZIPCd>
        </USAddress>
        <PhoneNum>9512832503</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SchoolOperatingInd>false</SchoolOperatingInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <RelatedOrgSect527OrgInd>false</RelatedOrgSect527OrgInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>true</FiledScheduleAInd>
    </IRS990EZ>
    <IRS990ScheduleA documentId="1" softwareId="24020071">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <SupportSumAmt>0</SupportSumAmt>
      <OtherSupportSumAmt>0</OtherSupportSumAmt>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearAmt>57245</CurrentTaxYearAmt>
        <TotalAmt>57245</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearAmt>57245</CurrentTaxYearAmt>
        <TotalAmt>57245</TotalAmt>
      </TotalCalendarYear170Grp>
      <PublicSupportTotal170Amt>57245</PublicSupportTotal170Amt>
      <TotalSupportAmt>57245</TotalSupportAmt>
      <First5Years170Ind>X</First5Years170Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="4" softwareId="24020071">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleO documentId="3" softwareId="24020071">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990EZ PART III ITEM 31</FormAndLineReferenceDesc>
        <ExplanationTxt>OVERALL ANNUAL PROGRAM EXPENSES ARE 4108.14</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990EZ PART I ITEM 16</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER EXPENDITURES AWARENESS $691 bANK CHARGES AND FEES $408 CONTRACT LABOOR $20593</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>CONTINUED FROM ABOVE</FormAndLineReferenceDesc>
        <ExplanationTxt>DUES AND SUBSCRIPTIONS $154 MEALS $2000 POSTAGE AND SHIPPING $186</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>CONTINUED FROM ABOVE</FormAndLineReferenceDesc>
        <ExplanationTxt>PROGRAM EXPENSES $4108 SUPPLIES $2706 TRANSPORTATION $501</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>CONTINUED FROM ABOVE</FormAndLineReferenceDesc>
        <ExplanationTxt>UTILITIES $94</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990EZ PART III</FormAndLineReferenceDesc>
        <ExplanationTxt>ADDITIONAL MISSION PROGRAMS STATEMENT "Fractions and healing go hand-in-hand, let's stop bullying" MOTO FOR MATH AND SOCIAL EMOTIONAL LEARNING CAMPS</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>