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        <FormAndLineReferenceDesc>Schedule D, Part IV, Line 2b Explanation of escrow agreement</FormAndLineReferenceDesc>
        <ExplanationTxt>The School holds funds in a custodial manner for various School clubs and groups. These funds are not for the use of the School. When clubs and groups collect funds, they are given to the business office for deposit, and the funds are deposited to the School's main checking account at Huntington National Bank. Monthly statements are sent to the club advisor for clubs and groups with regular activities, such as language clubs and sports teams. If the account is for a group that does not have regular activity throughout the year, statements are sent when they are regularly depositing and using funds.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 4 Intended uses of endowment funds</FormAndLineReferenceDesc>
        <ExplanationTxt>Columbus School for Girls' endowment fund is to sustain the school for future generations while providing current students with financial aid scholarships and other donor-designated gifts.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part X, Line 2 FIN 48 (ASC 740) footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>Generally accepted accounting principles prescribe recognition thresholds and measurement attributes for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Tax benefits will be recognized only if a tax position is more likely than not sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized will be the largest amount of tax benefit that is greater than 50% likely to be realized on examination. For tax positions not meeting the more-likely-than-not test, no tax benefit will be recorded. Management has concluded that they are unaware of any tax benefits or liabilities to be recognized on June 30, 2025, or 2024.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part XI, Line 4(b) Other revenues in form 990 not in audited financial statements</FormAndLineReferenceDesc>
        <ExplanationTxt>Rental Expense - -6467 Scholarship Walk Expense - -4755 SCHOLARSHIP AND FINANCIAL AID - 3490356</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part XII, Line 2(d) Other expenses in audited financial statements not in form 990</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>SCHOLARSHIP AND FINANCIAL AID - 3490356</ExplanationTxt>
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        <FormAndLineReferenceDesc>Schedule E, Part I, Line 3 RACIALLY NONDISCRIMINATORY POLICY</FormAndLineReferenceDesc>
        <ExplanationTxt>Columbus School for Girls administers its admission, financial aid, and employment policies without regard to race, religion, sexual orientation, creed, or national origin.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Schedule E, Part I, Line 6(a) FINANCIAL AID OR ASSISTANCE FROM A GOVERNMENT</FormAndLineReferenceDesc>
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        <FormAndLineReferenceDesc>Schedule I, Part I, Line 2 Procedures for monitoring use of grant funds</FormAndLineReferenceDesc>
        <ExplanationTxt>CSG's Admission and Development offices work closely to award named scholarships to students. The parents submit a financial aid application and supporting tax forms online via Clarity, a third-party organization. CSG receives a report based on parents' income, expenses, and the amount they can afford for independent school tuition. CSG's financial aid committee reviews the parent information and grants awards as needed. The Admissions Office notifies the student of their scholarship amount. These grants are entered into the Sr. System financial aid software, which flows into the accounts receivable module. The total financial aid is based on a budget number that is on CSG's financial statement. If, in the rare instance, CSG requested a student leave, that portion of the financial aid would be designated back into the financial aid funds. The Development Office has the donor specifications for who should be awarded the scholarship. Once the student is chosen for the scholarship award, the Development office sends the donor a letter about the student.</ExplanationTxt>
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        <PersonNm>Camille Seals</PersonNm>
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        <PersonNm>Joe Powell</PersonNm>
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        <PersonNm>Amy Borntrager</PersonNm>
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        <PersonNm>Elizabeth Gugle</PersonNm>
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        <PersonNm>Kamaya P Thompson</PersonNm>
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        <DeferredCompensationFlngOrgAmt>7064</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>65475</NontaxableBenefitsFilingOrgAmt>
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        <TotalCompensationFilingOrgAmt>209255</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a Housing allowance or residence for personal use</FormAndLineReferenceDesc>
        <ExplanationTxt>The Head of School is required to live on campus. This benefit is considered nontaxable under IRC Section 119. An estimated value of the benefit was reported for Camille Seals for $50,000.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4b Supplemental nonqualified retirement plan</FormAndLineReferenceDesc>
        <ExplanationTxt>Camille Seals, Head of the School, participated in a supplemental nonqualified retirement plan. The school made a contribution to the plan of $6,893 in December 2024.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3 ARRANGEMENT USED TO ESTABLISH THE TOP MANAGEMENT OFFICIALS COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>COLUMBUS SCHOOL FOR GIRLS'S CFO PROVIDES THE BOARD OF TRUSTEES COMPENSATION COMMITTEE WITH SALARY INFORMATION FROM THE NATIONAL ASSOCIATION OF INDEPENDENT SCHOOLS (NAIS) ORGANIZATION. NAIS PROVIDES HEAD OF SCHOOL SALARY DATA BASED ON NUMEROUS CRITERIA, SUCH AS SCHOOL ENROLLMENT, AND LOCATION OF THE SCHOOL, SUCH AS MIDWEST, EAST OR WEST COAST. THE COMPENSATION COMMITTEE REVIEWS THE NAIS SALARY INFORMATION AND THE HEAD OF SCHOOL ANNUAL AND LONG-TERM GOALS. IN ADDITION, THE COMMITTEE CONSIDERS THE APPROVED FACULTY, STAFF, AND ADMINISTRATOR'S SALARY INCREASE APPROVED BY THE BOARD. AFTER DISCUSSION, THE COMMITTEE RECOMMENDS A SALARY TO THE BOARD OF TRUSTEES FOR APPROVAL. THE BOARD OF TRUSTEES MEETS IN EXECUTIVE SESSION TO DISCUSS AND VOTE ON THE HEAD OF SCHOOL'S COMPENSATION FOR THE NEW SCHOOL YEAR.</ExplanationTxt>
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        <BusinessName>
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        </BusinessName>
        <RelationshipWithOrgTxt>SEE PART V</RelationshipWithOrgTxt>
        <CashGrantAmt>28155</CashGrantAmt>
        <TypeOfAssistanceTxt>TUITION REMISSION</TypeOfAssistanceTxt>
        <AssistancePurposeTxt>50% Remission per School Policy</AssistancePurposeTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule L, Part III, Column (a) GRANTS OR ASSISTANCE BENEFITING INTERESTED PERSONS</FormAndLineReferenceDesc>
        <ExplanationTxt>COLUMBUS SCHOOL FOR GIRLS OFFER 50% TUITION REMISSION FOR ALL EMPLOYEES WITH DAUGHTERS WHO ARE CURRENT STUDENTS. CURRENTLY $28,155 IN TUITION REMISSION FUNDS ARE BEING RECEIVED BY FAMILY MEMBERS OF INTERESTED PERSONS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Schedule L, Part III, Column (a) Name of Interested Person</FormAndLineReferenceDesc>
        <ExplanationTxt>AS PER IRS INSTRUCTIONS FOR Form 990 SCHEDULE L, SCHOOLS ARE NOT REQUIRED TO IDENTIFY INTERESTED PERSONS TO WHOM THEY PROVIDED SCHOLARSHIPS, FELLOWSHIPS, AND SIMILAR FINANCIAL ASSISTANCE. THEREFORE, COLUMNS (A) AND (B) HAVE BEEN LEFT BLANK FOR THESE LINES.</ExplanationTxt>
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        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Equipment</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>38868</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Cost</MethodOfDeterminingRevenuesTxt>
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      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I Explanations of reporting method for number of contributions</FormAndLineReferenceDesc>
        <ExplanationTxt>Other - Equipment - the number of contributions received</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="24020961" softwareVersionNum="2024v5.1">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part I, Line 1 Brief mission continued</FormAndLineReferenceDesc>
        <ExplanationTxt>challenging academics, enriching arts and athletics, supportive relationships, and a range of diversity. We encourage girls and young women to discover their distinctive potential and to strive for excellence amid the challenges and opportunities of a global and dynamic world.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 1 ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>(FROM PART III) COLUMBUS SCHOOL FOR GIRLS, A COLLEGE PREPARATORY SCHOOL FOUNDED IN 1898, IS DEDICATED TO GIRLS' INTELLECTUAL, SOCIAL, AND ETHICAL GROWTH FROM INFANCY THROUGH TWELFTH GRADE. THE SCHOOL IS CHARACTERIZED BY CHALLENGING ACADEMICS, ENRICHING ARTS AND ATHLETICS, SUPPORTIVE RELATIONSHIPS, AND A RANGE OF DIVERSITY. WE ENCOURAGE GIRLS AND YOUNG WOMEN TO DISCOVER THEIR DISTINCTIVE POTENTIAL AND TO STRIVE FOR EXCELLENCE AMID THE CHALLENGES AND OPPORTUNITIES OF A GLOBAL AND DYNAMIC WORLD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 1a Committee Delegation</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Committee shall consist of the Board Chair, the Board Chair-Elect, all Board Vice Chairs, the chair of the Nominating and Board Governance Committee, the chair of the Finance Committee plus up to two additional trustees who are either the chair of a committee other than the Nominating and Board Governance Committee or are recommended by the Board Chair. The Board Chair shall serve as chair of the Executive Committee and be an ex-officio member, with full voting privileges, of all standing committees, including the Nominating and Board Governance Committee and the Finance Committee. Unless otherwise prohibited, the immediate past Board Chair of the Corporation shall serve as an ex-officio member of the Executive Committee, with full voting privileges for one year after his or her term ends as Board Chair. Non-officers shall not serve on the Executive Committee for more than three (3) consecutive one (1) year terms.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 4 Significant changes to organizational documents</FormAndLineReferenceDesc>
        <ExplanationTxt>On January 24, 2025, the organization adopted amendments to its Code of Regulations affecting board composition and committee structure. The revised bylaws removed the previous requirement that the board be comprised of one-third parents, one-third alumnae, and one-third independents, and now provide that the board will include parents, alumnae, and independents without specifying proportions. The minimum number of trustees required to serve on the Board Development and Finance Committees was also reduced from five to three.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>The full form 990 and supplemental schedules is reviewed by the CFO before filing. Crowe LLP, an independent accounting firm, will present the full form 990 and supplemental schedules to the Columbus School for Girls Finance Committee in May 2026. The full form 990 and supplemental schedules will then be sent to the Executive Committee and Board of Trustees upon filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>All Board members annually complete a confidentiality/conflict of interest statement. If a conflict arises, it is noted and reviewed by the Board to determine if any action needs to be taken. Individuals with conflicts abstain from voting on such matters.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a Process to establish compensation of top management official</FormAndLineReferenceDesc>
        <ExplanationTxt>Columbus School for Girls's CFO provides the Board of Trustees Compensation Committee with salary information from the National Association of Independent Schools (NAIS) organization. NAIS provides Head of School salary data based on numerous criteria, such as enrollment and the school's location, such as Midwest, east, or West Coast. When the contract is up for renewal, the committee may use an outside consultant to determine salary and compensation. The independent Compensation committee reviews the NAIS salary information and the Head of the School's annual and long-term goals. In addition, the committee considers the approved faculty, staff, and administrator's salary increase approved by the Board. After discussion, the committee recommends a salary to the Board of Trustees for approval. The Board of Trustees meets in an Executive session to discuss and vote on the Head of the School's compensation for the new school year. This is documented in the board minutes and is conducted annually.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b Process to establish compensation of other employees</FormAndLineReferenceDesc>
        <ExplanationTxt>Officers' compensation is based on an annual salary increase approved each year by the Board of Trustees. The salary increase is part of the school's budget process. This is documented in the board minutes and is conducted annually. As with the Head of School's compensation, CSG's officer's salary is reviewed per the guidelines established with the National Association of Independent Schools (NAIS). NAIS has salary information based on school enrollment and region of the country.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>Financial statements, governing documents, and conflict of interest policies are not required disclosures pursuant to Internal Revenue Code (IRC) Section 6104. These documents are not available to the public.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 2f Other Program Service Revenue</FormAndLineReferenceDesc>
        <ExplanationTxt>Transportation - Total Revenue: 30400, Related or Exempt Function Revenue: 30400, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ; Spring Break Camp - Total Revenue: 14277, Related or Exempt Function Revenue: 14277, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ; Unicorn Sports - Total Revenue: 16625, Related or Exempt Function Revenue: 16625, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ; Athletic Gates - Total Revenue: 18765, Related or Exempt Function Revenue: 18765, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ;</ExplanationTxt>
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