Liabilities / Assets
82nd percentile
Higher debt load relative to assets than 82% of similar nonprofits.
EIN 04-2555680 • 501(c)3 • Andover, MA
Profile
Andover school of montessori, inc. Is a massachusetts coeducational day school. Its principal business activity is the operation of a private pre- school, kindergarten and elementary grade school in andover, massachusetts and surrounding communities, using the montessori philosophy and method of teaching.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
82nd percentile
Higher debt load relative to assets than 82% of similar nonprofits.
Liabilities / Revenue
86th percentile
Higher debt load relative to revenue than 86% of similar nonprofits.
Net Margin
42nd percentile
Higher net margin than 42% of similar nonprofits.
Top Officer Pay
72nd percentile
Higher top officer pay than 72% of similar nonprofits.
Top officer pay equals 4.9% of source-year revenue.
Asset Growth
40th percentile
Faster asset growth than 40% of similar nonprofits.
Revenue Growth
24th percentile
Faster revenue growth than 24% of similar nonprofits.
Assets
Up$8,016,514
Up $90,183 (+1.1%) from 2024
Liabilities
Down$4,499,372
Down $43,110 (-0.9%) from 2024
Net Assets
Up$3,517,142
Up $133,293 (+3.9%) from 2024
Revenue
Down$3,879,148
Down $333,650 (-7.9%) from 2024
Expenses
Up$3,821,026
Up $12,448 (+0.3%) from 2024
Net Income
Down$58,122
Down $346,098 (-86%) from 2024
Most recent year
2025 • Form 990Detailed filing. Detailed filing data is available for this year.
Andover school of montessori fosters the growth of joyous learners and responsible citizens. We encourage curiosity, deep thinking and respect for oneself and others.
See Schedule O
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $3,005,845 | $2,820,885 | ▼ $184,960 |
| Investments in Publicly Traded Securities | $2,604,936 | $2,767,784 | ▲ $162,848 |
| Accounts Receivable | $1,476,896 | $1,407,834 | ▼ $69,062 |
| Cash and Non-Interest-Bearing Accounts | $776,861 | $971,468 | ▲ $194,607 |
| Intangible Assets | $40,772 | $38,408 | ▼ $2,364 |
| Prepaid Expenses and Deferred Charges | $6,438 | $7,106 | ▲ $668 |
| Total Assets | $7,926,331 | $8,016,514 | ▲ $90,183 |
| Other Assets Total | $14,583 | $3,029 | ▼ $11,554 |
| Liabilities | |||
| Deferred Revenue | $2,946,777 | $2,945,535 | ▼ $1,242 |
| Other Liabilities | $1,328,036 | $1,258,028 | ▼ $70,008 |
| Accounts Payable and Accrued Expenses | $267,669 | $295,809 | ▲ $28,140 |
| Total Liabilities | $4,542,482 | $4,499,372 | ▼ $43,110 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $3,139,537 | $3,187,307 | ▲ $47,770 |
| Net Assets With Donor Restrictions | $244,312 | $329,835 | ▲ $85,523 |
| Total Net Assets Fund Balance | $3,383,849 | $3,517,142 | ▲ $133,293 |
| Total Liabilities and Net Assets / Fund Balance | $7,926,331 | $8,016,514 | ▲ $90,183 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $2,166,411 | $3,043,417 | $5,209,828 |
| Equipment | $96,988 | $878,203 | $975,191 |
| Land | $557,486 | - | $557,486 |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $188,962 | $61,060 | ▲ $23,363 | - | $273,385 |
| 2023 | $125,934 | $43,923 | ▲ $19,105 | - | $188,962 |
| 2022 | $109,019 | $6,600 | ▲ $10,315 | - | $125,934 |
| 2021 | $21,198 | $106,600 | ▼ $18,779 | - | $109,019 |
| 2020 | $21,186 | $12 | - | - | $21,198 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Barbara Orlowitz | Head of School | FT | $184,150 | $7,366 | $191,516 |
| Michelle Finno | Enrollment Director | FT | $108,454 | $25,291 | $133,745 |
| Shannon Lavelle | Director of Finance & Oper | FT | $116,386 | $4,655 | $121,041 |
| Name | Title |
|---|---|
| David Neshat | President |
| Daniel Shafrir | Trustee |
| Jocelyn Greer | Trustee |
| Lisa Perdigao | Trustee |
| Louisa Proctor | Trustee |
| Rupam Som | Trustee |
| Jocelyn Pan | Clerk |
| Elyse Chase | Development/Capital Commit |
| Jessica Yu | Treasurer |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $2,563,135 |
| Other Expenses | $1,034,524 |
| Grants and Similar Amounts Paid | $223,367 |
| Total Fundraising Expense | $73,656 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $1,995,333 | $172,351 | - | $2,167,684 |
| Grants to Domestic Individuals | $223,367 | - | - | $223,367 |
| Depreciation Depletion | $195,218 | $24,128 | - | $219,346 |
| Other Employee Benefits | $190,953 | $16,494 | - | $207,447 |
| Payroll Taxes | $173,299 | $14,705 | - | $188,004 |
| All Other Expenses | $144,978 | $24,206 | - | $169,184 |
| Other Expenses | $72,048 | $16,003 | $72,972 | $72,972 |
| Insurance | $42,918 | $4,658 | - | $47,576 |
| Advertising | $47,008 | - | - | $47,008 |
| Interest | $36,603 | $4,524 | - | $41,127 |
| Fees for Services Accounting | - | $18,585 | - | $18,585 |
| Fees for Services Legal | $3,613 | $904 | - | $4,517 |
| Fees for Services Management | $2,231 | $2,094 | - | $4,325 |
| Total Functional Expenses | $3,423,341 | $324,029 | $73,656 | $3,821,026 |
| Line Item | Amount |
|---|---|
| Total Expenses per Form 990 | $3,821,026 |
| Expenses per Audited Statements | $3,597,659 |
| Total Expenses per Audited Statements | $3,597,659 |
| Expenses Not Reported on Financial Statements | $223,367 |
| Other Expense Adjustments | $223,367 |
| Expenses Not Reported on Form 990 | $0 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Liability | Amount |
|---|---|
| Note payable LT | $1,195,918 |
| Note payable ST | $60,335 |
| Lease Liability ST | $1,775 |
“The Completed Form 990 will be presented to the Board of Directors prior to its filing”
“Annual board signatures”
“The Board of Directors evaluates the Head of School and determines and approves salary. The Board of Directors approves the salary pool for allother employees and the Head of School determines each employee's salary. AISNE and AMS surveys, as well as benchmarking to local schools, are used for comparable salary range.”
“The Complete Form 990 is available at www.guidestar.com”
“Board minutes are available upon request. Financial statements are prepared monthly and presented to the Finance Committee. Quarterly financial statements are presented to the board. The treasurer presents an annual financial report at the annual meeting.”
“Andover School of Montessori, Inc. is a Massachusetts coeducational day school. Its principal business activity is the operation of a private pre-school, kindergarten and elementary and middle school in Andover, Massachusetts and surrounding communities, using the Montessori philosophy and method of teaching.”
“No changes to the process in place”
“Endowment funds are assets that provide support to the school in perpetuity. The endowment funds are invested and all of the investment return is permanently restricted until the desired endowment threshold is reached.”
“Income taxes are accounted for in accordance with the Accounting Standards Codification Topic 740 "Income Taxes" (ASC 740). The School accounts for uncertain income tax positions under ASC 740. ASC 740 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return and also provides guidance on de-recognition, classification, interest and penalties, disclosure and transition. As of June 30, 2025, the School had no material unrecognized tax benefits and no adjustments to liabilities or operations were required under ASC 740. The School's practice was and continues to be to recognize interest and penalty expenses related to uncertain tax positions in income tax expense, which were zero for the year ended June 30, 2025.”
“Grants and other assistance to domestic individuals 223,367.”
“Grants and other assistance to domestic individuals 223,367.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
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| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 267669 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 295809 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 1476896 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 1407834 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | See Schedule O |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 47008 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 47008 |
| IRS990/AllOtherContributionsAmt | 0 | 136549 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 24206 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 144978 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 169184 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | Shannon Lavelle |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 9784752299 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 400 South Main Street |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Andover |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 01810 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 776861 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 971468 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 160549 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 223367 |
| IRS990/CYInvestmentIncomeAmt | 0 | 124761 |
| IRS990/CYOtherExpensesAmt | 0 | 1034524 |
| IRS990/CYOtherRevenueAmt | 0 | 50357 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 3543481 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 58122 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 2563135 |
| IRS990/CYTotalExpensesAmt | 0 | 3821026 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 73656 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 3879148 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 2946777 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 2945535 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 24128 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 195218 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 219346 |
| IRS990/Desc | 0 | Education of pre-school, elementary and middle school children, ages 3-14 using the Montessori philosophy. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 244312 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 329835 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 68 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 3423341 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 18585 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 18585 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 904 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 3613 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 4517 |
| IRS990/FeesForServicesManagementGrp/ManagementAndGeneralAmt | 0 | 2094 |
| IRS990/FeesForServicesManagementGrp/ProgramServicesAmt | 0 | 2231 |
| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 4325 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form1098CFiledInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form8899Filedind | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| 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/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 4655 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Jocelyn Pan |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Jessica Yu |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Elyse Chase |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Louisa Proctor |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | David Neshat |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Jocelyn Greer |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Lisa Perdigao |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Daniel Shafrir |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Rupam Som |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Barbara Orlowitz |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | Michelle Finno |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | Shannon Lavelle |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | Clerk |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Development/Capital Commit |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | President |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Head of School |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Enrollment Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Director of Finance & Oper |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1974 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 9 |
| IRS990/GovernmentGrantsAmt | 0 | 24000 |
| IRS990/GrantAmt | 0 | 223367 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 223367 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 223367 |
| IRS990/GrantsToIndividualsInd | 0 | 1 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 3879148 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 9 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 4658 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 42918 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 47576 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 40772 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 38408 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 4524 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 36603 |
| IRS990/InterestGrp/TotalAmt | 0 | 41127 |
| IRS990/InvestmentIncomeGrp/RelatedOrExemptFuncIncomeAmt | 0 | 124761 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 124761 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 2604936 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 2767784 |
| IRS990/IRPDocumentCnt | 0 | 9 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 3921620 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 3005845 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 2820885 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 6742505 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| 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 | See Schedule O |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 3383849 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 3517142 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 75171 |
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| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 3187307 |
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| IRS990/ProgSrvcAccomActyOtherGrp/Desc | 0 | Andover School of Montessori fosters the growth of joyous learners and responsible citizens. We encourage curiosity, deep thinking and respect for oneself and others. |
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| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
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| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 3655781 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | Endowment funds are assets that provide support to the school in perpetuity. The endowment funds are invested and all of the investment return is permanently restricted until the desired endowment threshold is reached. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 1 | Income taxes are accounted for in accordance with the Accounting Standards Codification Topic 740 "Income Taxes" (ASC 740). The School accounts for uncertain income tax positions under ASC 740. ASC 740 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return and also provides guidance on de-recognition, classification, interest and penalties, disclosure and transition. As of June 30, 2025, the School had no material unrecognized tax benefits and no adjustments to liabilities or operations were required under ASC 740. The School's practice was and continues to be to recognize interest and penalty expenses related to uncertain tax positions in income tax expense, which were zero for the year ended June 30, 2025. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 2 | Grants and other assistance to domestic individuals 223,367. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 3 | Grants and other assistance to domestic individuals 223,367. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Part V, Line 4: |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Part X, Line 2: |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Part XI, Line 4b - Other Adjustments: |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Part XII, Line 4b - Other Adjustments: |
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| IRS990ScheduleE/DiscriminateRaceStdntsRghtsInd | 0 | 0 |
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