Liabilities / Assets
78th percentile
Higher debt load relative to assets than 78% of similar nonprofits.
EIN 36-3043306 • 501(c)3 • Lemont, IL
Profile
It is the mission of the Montessori School of Lemont to provide for the physical, intellectual, emotional and spiritual education of children ages 3-15 years following the methods and philosophy of Dr. Maria Montessori.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
78th percentile
Higher debt load relative to assets than 78% of similar nonprofits.
Liabilities / Revenue
87th percentile
Higher debt load relative to revenue than 87% of similar nonprofits.
Net Margin
65th percentile
Higher net margin than 65% of similar nonprofits.
Top Officer Pay
75th percentile
Higher top officer pay than 75% of similar nonprofits.
Top officer pay equals 7.7% of source-year revenue.
Asset Growth
45th percentile
Faster asset growth than 45% of similar nonprofits.
Revenue Growth
35th percentile
Faster revenue growth than 35% of similar nonprofits.
Assets
Up$3,553,631
Up $67,361 (+1.9%) from 2024
Liabilities
Down$1,376,455
Down $140,548 (-9.3%) from 2024
Net Assets
Up$2,177,176
Up $207,909 (+11%) from 2024
Revenue
Down$1,587,467
Down $8,918 (-0.6%) from 2024
Expenses
Up$1,379,557
Up $93,757 (+7.3%) from 2024
Net Income
Down$207,910
Down $102,675 (-33%) from 2024
Most recent year
2025 • Form 990Detailed filing. Detailed filing data is available for this year.
It is the mission of the Montessori School of Lemont to provide for the physical, intellectual, emotional and spiritual education of children ages 3-15 years following the methods and philosophy of Dr. Maria Montessori.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Savings and Temporary Cash Investments | $1,599,808 | $1,630,641 | ▲ $30,833 |
| Land, Buildings, and Equipment, Net | $1,571,285 | $1,602,240 | ▲ $30,955 |
| Cash and Non-Interest-Bearing Accounts | $314,927 | $318,069 | ▲ $3,142 |
| Accounts Receivable | $250 | $2,681 | ▲ $2,431 |
| Total Assets | $3,486,270 | $3,553,631 | ▲ $67,361 |
| Liabilities | |||
| Other Liabilities | $1,235,688 | $1,118,852 | ▼ $116,836 |
| Deferred Revenue | $150,428 | $130,297 | ▼ $20,131 |
| Accounts Payable and Accrued Expenses | $130,887 | $127,306 | ▼ $3,581 |
| Total Liabilities | $1,517,003 | $1,376,455 | ▼ $140,548 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $1,486,642 | $1,870,873 | ▲ $384,231 |
| Net Assets With Donor Restrictions | $482,625 | $306,303 | ▼ $176,322 |
| Total Net Assets Fund Balance | $1,969,267 | $2,177,176 | ▲ $207,909 |
| Total Liabilities and Net Assets / Fund Balance | $3,486,270 | $3,553,631 | ▲ $67,361 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $1,288,345 | $1,741,381 | $3,029,726 |
| Leasehold Improvements | $57,758 | $174,391 | $232,149 |
| Other Land Buildings | $121,325 | $48,310 | $169,635 |
| Land | $97,299 | - | $97,299 |
| Equipment | $37,513 | $22,929 | $60,442 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Therese Colby | President | FT | $102,691 | $19,332 | $122,023 |
| James Hilgenbrink | Treasurer | FT | $57,942 | $1,738 | $59,680 |
| Norine Colby | Director | PT | $36,760 | - | $36,760 |
| Name | Title |
|---|---|
| Paul Westman | Vice President |
| Mary Zeronas | Director |
| Sheila Lamb | Director |
| Deborah Moreno | Secretary |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $940,832 |
| Other Expenses | $438,725 |
| Total Fundraising Expense | $18,273 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $475,127 | $88,592 | $8,095 | $571,814 |
| Current Officers, Directors, Trustees, and Key Employees | $184,267 | $34,445 | $3,136 | $221,848 |
| Depreciation Depletion | $101,992 | $19,030 | $1,737 | $122,759 |
| Occupancy | $68,927 | $12,861 | $1,174 | $82,962 |
| Other Employee Benefits | $66,955 | $11,106 | $1,187 | $79,248 |
| Payroll Taxes | $47,496 | $9,967 | $771 | $58,234 |
| Interest | $39,361 | $7,345 | $670 | $47,376 |
| Office Expenses | $33,961 | $1,554 | $142 | $35,657 |
| Fees for Services Other | - | $17,449 | - | $17,449 |
| All Other Expenses | $13,843 | - | $598 | $14,441 |
| Insurance | $10,500 | $1,959 | $179 | $12,638 |
| Other Expenses | $22,895 | $11,312 | $460 | $11,312 |
| Pension Plan Contributions | $7,828 | $1,736 | $124 | $9,688 |
| Fees for Services Accounting | - | $8,038 | - | $8,038 |
| Advertising | - | $5,683 | - | $5,683 |
| Conferences and Meetings | $1,759 | - | - | $1,759 |
| Total Functional Expenses | $1,125,169 | $236,115 | $18,273 | $1,379,557 |
| Line Item | Amount |
|---|---|
| Expenses per Audited Statements | $1,379,557 |
| Total Expenses per Audited Statements | $1,379,557 |
| Total Expenses per Form 990 | $1,379,557 |
| Expenses Not Reported on Financial Statements | $0 |
| Expenses Not Reported on Form 990 | $0 |
| Line Item | Amount |
|---|---|
| Fundraising Gross Income | $27,194 |
| Fundraising Direct Expenses | $5,447 |
| Professional Fundraising Fees | $0 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Auction | $24,424 | $24,424 | $598 | $23,826 |
| Total Events | $24,424 | $24,424 | $4,958 | $19,466 |
| Liability | Amount |
|---|---|
| Loan Payable, Net of current portion | $1,118,852 |
“Norine Colby (Board Member) is the Mother of Therese Colby. Therese Colby (Executive Director/Board President) is the daughter of Norine Colby. Jim Hilgenbrink (Business Manager/Board Treasurer) is the spouse of Therese Colby.”
“The Form 990 was reviewed by the Executive Director and provided to the entire Board prior to filing.”
“Payments to vendors are approved and monitored by the Board to ensure no self-dealing is occurring among other conflicts.”
“The Independent Board of Directors reviews and approves the Executive Director and Treasurer's compensation.”
“Governing documents and filings are available for review to the public in the school office.”
“FIN 48 Footnote from Audited Financials The Organization was granted an exemption from federal income tax by the Internal Revenue Service pursuant to the provisions of Internal Revenue Code Section 501(c)(3). The Organization qualifies for the charitable contribution deduction under Section 170(b)(1)(A)(vi) and has been classified as an Organization that is not a private Organization under Section 509(a)(1). The tax- exempt purpose of the Organization and the nature in which it operates is described above. Management believes the Organization operates in compliance with its tax-exempt purpose. Thus, no provision for income tax has been provided for in the financial statements. The Organization has adopted the requirements for accounting for uncertain tax positions and management has determined that the Organization was not required to record a liability related to uncertain tax positions as of July 31, 2025.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 130887 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 127306 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 250 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 2681 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | It is the mission of the Montessori School of Lemont to provide for the physical, intellectual, emotional and spiritual education of children ages 3-15 years following the methods and philosophy of Dr. Maria Montessori. |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 5683 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 5683 |
| IRS990/AllOtherContributionsAmt | 0 | 39564 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 598 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 13843 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 14441 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 0 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | Jim Hilgenbrink |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 8158340607 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 16427 W 135th Street |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Lemont |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 60439 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 314927 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 318069 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 3136 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 34445 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 184267 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 221848 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 1759 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 1759 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 39564 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 30833 |
| IRS990/CYOtherExpensesAmt | 0 | 438725 |
| IRS990/CYOtherRevenueAmt | 0 | 21747 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 1495323 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 207910 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 940832 |
| IRS990/CYTotalExpensesAmt | 0 | 1379557 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 18273 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 1587467 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 150428 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 130297 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 1737 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 19030 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 101992 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 122759 |
| IRS990/Desc | 0 | The school provided preschool and elementary school services to 136 children during the 2024-2025 school year. It is the mission of the Montessori School of Lemont to provide for the physical, intellectual, emotional and spiritual education of children ages 3-15 years following the methods and philosophy of Dr. Maria Montessori. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 482625 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 306303 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 26 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 1125169 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 1 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 8038 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 8038 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 17449 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 17449 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 45.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 45.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 20.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 19332 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 1738 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Therese Colby |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Paul Westman |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | James Hilgenbrink |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Deborah Moreno |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Norine Colby |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Sheila Lamb |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Mary Zeronas |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 102691 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 57942 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 36760 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | President |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Vice President |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Director |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1979 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 5447 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 27194 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 7 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 1592914 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 4 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 1 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 179 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 1959 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 10500 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 12638 |
| IRS990/InterestGrp/FundraisingAmt | 0 | 670 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 7345 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 39361 |
| IRS990/InterestGrp/TotalAmt | 0 | 47376 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 30833 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 30833 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 3 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 1987011 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1571285 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1602240 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 3589251 |
| IRS990/LegalDomicileStateCd | 0 | IL |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | It is the mission of the Montessori School of Lemont to provide for the physical, intellectual, emotional and spiritual education of children ages 3-15 years following the methods and philosophy of Dr. Maria Montessori. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 1969267 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 2177176 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | 21747 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 21747 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 1486642 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 1870873 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 1174 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 12861 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 68927 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 82962 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 142 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 1554 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 33961 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 35657 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 1187 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 11106 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 66955 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 79248 |
| IRS990/OtherExpensesGrp/Desc | 0 | Equipment Rental and Ma |
| IRS990/OtherExpensesGrp/Desc | 1 | School Activities |
| IRS990/OtherExpensesGrp/Desc | 2 | Contract personnel |
| IRS990/OtherExpensesGrp/Desc | 3 | Miscellaneous |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 460 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 5038 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 11312 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 27001 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 23257 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 22895 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 32499 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 23257 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 22895 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 11312 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 1235688 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 1118852 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 8095 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 88592 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 475127 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 571814 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 771 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 9967 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 47496 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 58234 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 124 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 1736 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 7828 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 9688 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrincipalOfficerNm | 0 | Therese Colby |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 611110 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 611110 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 611110 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | Tuition |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | School Activities |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | Application and other |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 1413959 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 59164 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 22200 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 1413959 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 59164 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 22200 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 28539 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 46229 |
| IRS990/PYOtherExpensesAmt | 0 | 416964 |
| IRS990/PYOtherRevenueAmt | 0 | 33169 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 1488448 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 310585 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 868836 |
| IRS990/PYTotalExpensesAmt | 0 | 1285800 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 1596385 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 207910 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 1 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 1495323 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 1599808 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 1630641 |
| IRS990ScheduleA/SchoolInd | 0 | X |
| IRS990/ScheduleBRequiredInd | 0 | 0 |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 1288345 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 1741381 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 3029726 |
| IRS990ScheduleD/EquipmentGrp/BookValueAmt | 0 | 37513 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 22929 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 60442 |
| IRS990ScheduleD/ExpensesNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 1379557 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/LandGrp/BookValueAmt | 0 | 97299 |
| IRS990ScheduleD/LandGrp/OtherCostOrOtherBasisAmt | 0 | 97299 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/BookValueAmt | 0 | 57758 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/DepreciationAmt | 0 | 174391 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/OtherCostOrOtherBasisAmt | 0 | 232149 |
| IRS990ScheduleD/OtherLandBuildingsGrp/BookValueAmt | 0 | 121325 |
| IRS990ScheduleD/OtherLandBuildingsGrp/DepreciationAmt | 0 | 48310 |
| IRS990ScheduleD/OtherLandBuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 169635 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 1118852 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | Loan Payable, Net of current portion |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/RevenueNotReportedFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 1587467 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | FIN 48 Footnote from Audited Financials The Organization was granted an exemption from federal income tax by the Internal Revenue Service pursuant to the provisions of Internal Revenue Code Section 501(c)(3). The Organization qualifies for the charitable contribution deduction under Section 170(b)(1)(A)(vi) and has been classified as an Organization that is not a private Organization under Section 509(a)(1). The tax- exempt purpose of the Organization and the nature in which it operates is described above. Management believes the Organization operates in compliance with its tax-exempt purpose. Thus, no provision for income tax has been provided for in the financial statements. The Organization has adopted the requirements for accounting for uncertain tax positions and management has determined that the Organization was not required to record a liability related to uncertain tax positions as of July 31, 2025. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Part X, Line 2: |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 1602240 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 1379557 |
| IRS990ScheduleD/TotalLiabilityAmt | 0 | 1118852 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 1587467 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 1587467 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 1379557 |
| IRS990ScheduleE/ComplianceWithRevProc7550Ind | 0 | 1 |
| IRS990ScheduleE/DiscriminateRaceAdmissPlcyInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceAthltProgInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceEducPlcyInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceEmplmFcultyInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceOtherActyInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceSchsInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceStdntsRghtsInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceUseOfFcltsInd | 0 | 0 |
| IRS990ScheduleE/GovernmentFinancialAidRcvdInd | 0 | 0 |
| IRS990ScheduleE/GovernmentFinancialAidRvkdInd | 0 | 0 |
| IRS990ScheduleE/MaintainCpyOfAllSolInd | 0 | 1 |
| IRS990ScheduleE/MaintainCpyOfBrochuresEtcInd | 0 | 1 |
| IRS990ScheduleE/MaintainRacialCompRecsInd | 0 | 1 |
| IRS990ScheduleE/MaintainScholarshipsRecsInd | 0 | 1 |
| IRS990ScheduleE/NondiscriminatoryPolicyStmtInd | 0 | 1 |
| IRS990ScheduleE/PlcyPblczdViaBroadcastMediaInd | 0 | 1 |
| IRS990ScheduleE/PolicyStmtInBrochuresEtcInd | 0 | 1 |
| IRS990ScheduleG/FundraisingEventInformationGrp/DirectExpenseSummaryEventsAmt | 0 | 4958 |
| IRS990ScheduleG/FundraisingEventInformationGrp/EntertainmentEvent1Amt | 0 | 2120 |
| IRS990ScheduleG/FundraisingEventInformationGrp/EntertainmentTotalEventsAmt | 0 | 2120 |
| IRS990ScheduleG/FundraisingEventInformationGrp/Event1Nm | 0 | Auction |
| IRS990ScheduleG/FundraisingEventInformationGrp/FoodAndBeverageEvent1Amt | 0 | 2240 |
| IRS990ScheduleG/FundraisingEventInformationGrp/FoodAndBeverageTotalEventsAmt | 0 | 2240 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossReceiptsEvent1Amt | 0 | 24424 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossReceiptsTotalAmt | 0 | 24424 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossRevenueEvent1Amt | 0 | 24424 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossRevenueTotalEventsAmt | 0 | 24424 |
| IRS990ScheduleG/FundraisingEventInformationGrp/NetIncomeSummaryAmt | 0 | 19466 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OthDirectExpnssTotalEventsAmt | 0 | 598 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OtherDirectExpensesEvent1Amt | 0 | 598 |
| IRS990/ScheduleJRequiredInd | 0 | 0 |
| IRS990/ScheduleORequiredInd | 0 | 1 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | Norine Colby (Board Member) is the Mother of Therese Colby. Therese Colby (Executive Director/Board President) is the daughter of Norine Colby. Jim Hilgenbrink (Business Manager/Board Treasurer) is the spouse of Therese Colby. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | The Form 990 was reviewed by the Executive Director and provided to the entire Board prior to filing. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | Payments to vendors are approved and monitored by the Board to ensure no self-dealing is occurring among other conflicts. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | The Independent Board of Directors reviews and approves the Executive Director and Treasurer's compensation. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 4 | Governing documents and filings are available for review to the public in the school office. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Form 990, Part VI, Section A, line 2 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Form 990, Part VI, Section B, line 11b |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Form 990, Part VI, Section B, line 12c |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Form 990, Part VI, Section B, line 15 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 4 | Form 990, Part VI, Section C, line 19 |
| IRS990/SchoolOperatingInd | 0 | 1 |
| IRS990/SignificantChangeInd | 0 | 0 |
| IRS990/SignificantNewProgramSrvcInd | 0 | 0 |
| IRS990/StatesWhereCopyOfReturnIsFldCd | 0 | IL |
| IRS990/SubjectToExcsTaxNetInvstIncInd | 0 | 0 |
| IRS990/SubjectToProxyTaxInd | 0 | 0 |
| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | 0 |
| IRS990/TaxablePartyNotificationInd | 0 | 0 |
| IRS990/TaxExemptBondsInd | 0 | 0 |
| IRS990/TerminateOperationsInd | 0 | 0 |
| IRS990/TotalAssetsBOYAmt | 0 | 3486270 |
| IRS990/TotalAssetsEOYAmt | 0 | 3553631 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 3486270 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 3553631 |
| IRS990/TotalCompGreaterThan150KInd | 0 | 0 |
| IRS990/TotalContributionsAmt | 0 | 39564 |
| IRS990/TotalEmployeeCnt | 0 | 26 |
| IRS990/TotalFunctionalExpensesGrp/FundraisingAmt | 0 | 18273 |
| IRS990/TotalFunctionalExpensesGrp/ManagementAndGeneralAmt | 0 | 236115 |
| IRS990/TotalFunctionalExpensesGrp/ProgramServicesAmt | 0 | 1125169 |
| IRS990/TotalFunctionalExpensesGrp/TotalAmt | 0 | 1379557 |
| IRS990/TotalGrossUBIAmt | 0 | 0 |
| IRS990/TotalLiabilitiesBOYAmt | 0 | 1517003 |
| IRS990/TotalLiabilitiesEOYAmt | 0 | 1376455 |
| IRS990/TotalLiabilitiesGrp/BOYAmt | 0 | 1517003 |
| IRS990/TotalLiabilitiesGrp/EOYAmt | 0 | 1376455 |
| IRS990/TotalNetAssetsFundBalanceGrp/BOYAmt | 0 | 1969267 |
| IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt | 0 | 2177176 |
| IRS990/TotalOtherCompensationAmt | 0 | 21070 |
| IRS990/TotalProgramServiceExpensesAmt | 0 | 1125169 |
| IRS990/TotalProgramServiceRevenueAmt | 0 | 1495323 |
| IRS990/TotalReportableCompFromOrgAmt | 0 | 197393 |
| IRS990/TotalRevenueGrp/ExclusionAmt | 0 | 52580 |
| IRS990/TotalRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 1495323 |
| IRS990/TotalRevenueGrp/TotalRevenueColumnAmt | 0 | 1587467 |
| IRS990/TotalRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
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