Liabilities / Assets
89th percentile
Tied with the lowest-debt nonprofits in its peer group.
EIN 04-6016348 • 4947(a)1 • Boston, MA
Profile
To provide funds to President & Fellows of Harvard College (Harvard), Cambridge, MA to support operating and maintenance expenses for the Weld Boat House and the Rowing Program at Harvard.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
89th percentile
Tied with the lowest-debt nonprofits in its peer group.
Liabilities / Revenue
30th percentile
Tied with the lowest-debt nonprofits in its peer group.
Net Margin
88th percentile
Higher net margin than 88% of similar nonprofits.
Top Officer Pay
Score unavailable
No filing with officer rows is available for this organization yet.
Asset Growth
67th percentile
Faster asset growth than 67% of similar nonprofits.
Revenue Growth
96th percentile
Faster revenue growth than 96% of similar nonprofits.
Assets
Up$2,843,533
Up $225,010 (+8.6%) from 2024
Liabilities
Flat$0
Flat from 2024
Net Assets
Up$2,843,533
Up $225,010 (+8.6%) from 2024
Revenue
Up$680,157
Up $503,132 (+284%) from 2024
Expenses
Up$116,239
Up $79,151 (+213%) from 2024
Net Income
Up$563,918
Up $423,981 (+303%) from 2024
Most recent year
2025 • Form 990Detailed filing. Detailed filing data is available for this year.
To provide funds to Harvard University, Cambridge, MA to support operating and maintenance expenses for the Weld Boat House and the Rowing Program at Harvard University.
To support operating and maintenance expenses for the Weld Boat House and the Rowing Program at Harvard College.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments in Publicly Traded Securities | $2,417,500 | $2,749,638 | ▲ $332,138 |
| Cap Stk Tr Prin Current Funds | $1,768,159 | $1,429,250 | ▼ $338,909 |
| Rtn Earn Endowment Incm Other Fnds | $850,364 | $1,414,283 | ▲ $563,919 |
| Savings and Temporary Cash Investments | $201,023 | $93,895 | ▼ $107,128 |
| Pd in Cap Srpls Land Bldg Eqp Fund | $0 | $0 | → $0 |
| Total Assets | $2,618,523 | $2,843,533 | ▲ $225,010 |
| Liabilities | |||
| Total Liabilities | $0 | $0 | → $0 |
| Net Assets / Fund Balance | |||
| Total Net Assets Fund Balance | $2,618,523 | $2,843,533 | ▲ $225,010 |
| Total Liabilities and Net Assets / Fund Balance | $2,618,523 | $2,843,533 | ▲ $225,010 |
| Name | Title |
|---|---|
| Cecile Tucker | Trustee |
| Cornelia VR Streeter | Trustee |
| Lauren Sheerr Beshears | Trustee |
| Renat V Lumpau | Trustee |
| Susannah Thayer | Trustee (end 1/2025) |
| Sarah Conyngham | Trustee (start 1/2025) |
| Line Item | Amount |
|---|---|
| Grants and Similar Amounts Paid | $82,000 |
| Other Expenses | $34,239 |
| Professional Fundraising Fees | $0 |
| Salaries, Compensation, and Employee Benefits | $0 |
| Total Fundraising Expense | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Grants to Domestic Orgs | $82,000 | - | - | $82,000 |
| Fees for Service Investment Mgmnt Fees | $7,496 | $22,487 | - | $29,983 |
| Fees for Services Accounting | $1,650 | $1,650 | - | $3,300 |
| Other Expenses | $35 | $921 | - | $35 |
| Total Functional Expenses | $91,181 | $25,058 | $0 | $116,239 |
| Recipient | Location | Category | Purpose | Amount |
|---|---|---|---|---|
| President & Fellows of Harvard College | Cambridge, MA | 501(c)(3) | Weld Boathouse Repairs and Maintenance | $82,000 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
“In the event of a vacancy, or vacancies, in the Board of Trustees, the Trustees in office must obtain written approval by the supported organization, President and Fellows of Harvard College, to fill such vacancy or vacancies as may be necessary to constitute a board of five trustees.”
“A trustee of the Isabella M. Weld Trust Dated 3/31/1910 receives a copy of the required tax return filings to review and approve before they are signed and subsequently filed with the appropriate tax authorities. Copies are also provided to all of the other Trustees for their comments before filing.”
“Upon request.”
“The Isabella M. Weld Trust is a non-exempt charitable trust, subject to the provisions of IRC 4947(a)(1). As such, the Trust must file Form 990 or 990-PF in accordance with Code Section 6033(d). Additionally, the Trust must file Form 1041 under Section 6012 to the extent it has any taxable income. However, the Trust qualifies for the permanent set aside deduction pursuant to Section 642(c) and therefore has no taxable income for the current tax period and thus not required to file Form 1041.”
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/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | To support operating and maintenance expenses for the Weld Boat House and the Rowing Program at Harvard College. |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | Choate Hall & Stewart LLP |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6172485000 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | Two International Place |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Boston |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02110 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CapStkTrPrinCurrentFundsGrp/BOYAmt | 0 | 1768159 |
| IRS990/CapStkTrPrinCurrentFundsGrp/EOYAmt | 0 | 1429250 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 0 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 0 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 0 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 82000 |
| IRS990/CYInvestmentIncomeAmt | 0 | 680157 |
| IRS990/CYOtherExpensesAmt | 0 | 34239 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 563918 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/CYTotalExpensesAmt | 0 | 116239 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 680157 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/Desc | 0 | To provide funds to President & Fellows of Harvard College (Harvard), Cambridge, MA to support operating and maintenance expenses for the Weld Boat House and the Rowing Program at Harvard. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 0 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 1 |
| IRS990/EmployeeCnt | 0 | 0 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 91181 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 1650 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 1650 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 3300 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 22487 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ProgramServicesAmt | 0 | 7496 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 29983 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 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/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/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/PersonNm | 0 | Lauren Sheerr Beshears |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Sarah Conyngham |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Renat V Lumpau |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Cornelia VR Streeter |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Susannah Thayer |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Cecile Tucker |
| 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/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/TitleTxt | 0 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Trustee (start 1/2025) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Trustee (end 1/2025) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Trustee |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1910 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedInd | 0 | 0 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 618394 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 5 |
| IRS990/GrantAmt | 0 | 82000 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 82000 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 82000 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 1 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 2970849 |
| IRS990/GrossReceiptsAmt | 0 | 3032612 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 5 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartVInd | 0 | X |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 61763 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 61763 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 2417500 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 2749638 |
| IRS990/IRPDocumentCnt | 0 | 2 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 2352455 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingCashInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | To provide funds to President & Fellows of Harvard College (Harvard), Cambridge, MA to support operating and maintenance expenses for the Weld Boat House and the Rowing Program at Harvard. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 2618523 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 2843533 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 618394 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 618394 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -338908 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization4947a1NotPFInd | 0 | X |
| IRS990/OrgDoesNotFollowFASB117Ind | 0 | X |
| IRS990/OrgFiledInLieuOfForm1041Ind | 0 | 1 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/Desc | 0 | Foreign taxes on income |
| IRS990/OtherExpensesGrp/Desc | 1 | MA Form PC filing fee |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 921 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 35 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 921 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 35 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PdInCapSrplsLandBldgEqpFundGrp/BOYAmt | 0 | 0 |
| IRS990/PdInCapSrplsLandBldgEqpFundGrp/EOYAmt | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrincipalOfficerNm | 0 | Renat V Lumpau |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 0 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 177025 |
| IRS990/PYOtherExpensesAmt | 0 | 37088 |
| IRS990/PYOtherRevenueAmt | 0 | 0 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 139937 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/PYTotalExpensesAmt | 0 | 37088 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 177025 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 563918 |
| IRS990/RelatedEntityInd | 0 | 1 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 0 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 0 |
| IRS990/RtnEarnEndowmentIncmOthFndsGrp/BOYAmt | 0 | 850364 |
| IRS990/RtnEarnEndowmentIncmOthFndsGrp/EOYAmt | 0 | 1414283 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 201023 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 93895 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/Contribution35ControlledInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionControllerInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionFamilyInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ControlledDisqualifiedPrsnInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnControllIntInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnOwnrIntInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ExcessBusinessHoldingsRulesInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ListedByNameGoverningDocInd | 0 | 1 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/LoanDisqualifiedPersonInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/OrganizationChangeSuprtOrgInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/PaymentSubstantialContribtrInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgNotOrganizedUSInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgSectionC456Ind | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportNonSupportedOrgInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SuprtOrgNoIRSDeterminationInd | 0 | 0 |
| IRS990ScheduleA/Form990SchAType1SuprtOrgGrp/OperateBenefitNonSuprtOrgInd | 0 | 0 |
| IRS990ScheduleA/Form990SchAType1SuprtOrgGrp/PowerAppointMajorityDirTrstInd | 0 | 1 |
| IRS990ScheduleA/OtherSupportSumAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrganizationsCnt | 0 | 1 |
| IRS990ScheduleA/SupportedOrganizationsTotalCnt | 0 | 1 |
| IRS990ScheduleA/SupportedOrgInformationGrp/EIN | 0 | 042103580 |
| IRS990ScheduleA/SupportedOrgInformationGrp/GoverningDocumentListedInd | 0 | 1 |
| IRS990ScheduleA/SupportedOrgInformationGrp/OrganizationTypeCd | 0 | 2 |
| IRS990ScheduleA/SupportedOrgInformationGrp/OtherSupportAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportAmt | 0 | 82000 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportedOrganizationName/BusinessNameLine1Txt | 0 | President & Fellows of Harvard College |
| IRS990ScheduleA/SupportingOrganization509a3Ind | 0 | X |
| IRS990ScheduleA/SupportingOrgType1Ind | 0 | X |
| IRS990ScheduleA/SupportSumAmt | 0 | 82000 |
| IRS990/ScheduleBRequiredInd | 0 | 0 |
| IRS990ScheduleI/GrantRecordsMaintainedInd | 0 | 1 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 0 | 82000 |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 0 | 501(c)(3) |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 0 | 0 |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 0 | Weld Boathouse Repairs and Maintenance |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 0 | President & Fellows of Harvard College |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 0 | 042103580 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 0 | 124 Mount Auburn Street |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 0 | Cambridge |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 0 | 02138 |
| IRS990ScheduleI/SupplementalInformationDetail/ExplanationTxt | 0 | The filing organization is a Type I supporting organization of the Presidents & Fellows of Harvard College, and provides grants only to this supported organization for specific purposes. |
| IRS990ScheduleI/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Part I, Line 2: |
| IRS990ScheduleI/Total501c3OrgCnt | 0 | 1 |
| IRS990ScheduleI/TotalOtherOrgCnt | 0 | 0 |
| IRS990/ScheduleJRequiredInd | 0 | 0 |
| IRS990/ScheduleORequiredInd | 0 | 1 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | The Isabella M. Weld Trust is a non-exempt charitable trust, subject to the provisions of IRC 4947(a)(1). As such, the Trust must file Form 990 or 990-PF in accordance with Code Section 6033(d). Additionally, the Trust must file Form 1041 under Section 6012 to the extent it has any taxable income. However, the Trust qualifies for the permanent set aside deduction pursuant to Section 642(c) and therefore has no taxable income for the current tax period and thus not required to file Form 1041. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | In the event of a vacancy, or vacancies, in the Board of Trustees, the Trustees in office must obtain written approval by the supported organization, President and Fellows of Harvard College, to fill such vacancy or vacancies as may be necessary to constitute a board of five trustees. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | A trustee of the Isabella M. Weld Trust Dated 3/31/1910 receives a copy of the required tax return filings to review and approve before they are signed and subsequently filed with the appropriate tax authorities. Copies are also provided to all of the other Trustees for their comments before filing. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | Upon request. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Form 990, Part V, Line 12: |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Form 990, Part VI, Section A, line 7a |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Form 990, Part VI, Section B, line 11b |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Form 990, Part VI, Section C, line 19 |
| IRS990ScheduleR/AssetExchangeInd | 0 | 0 |
| IRS990ScheduleR/AssetPurchaseFromOtherOrgInd | 0 | 0 |
| IRS990ScheduleR/AssetSaleToOtherOrgInd | 0 | 0 |
| IRS990ScheduleR/DivRelatedOrganizationInd | 0 | 0 |
| IRS990ScheduleR/GiftGrntCapContriFromOthOrgInd | 0 | 0 |
| IRS990ScheduleR/GiftGrntOrCapContriToOthOrgInd | 0 | 1 |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/ControlledOrganizationInd | 0 | 0 |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/DirectControllingNACd | 0 | N/A |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/DisregardedEntityName/BusinessNameLine1Txt | 0 | President & Fellows of Harvard College |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/EIN | 0 | 042103580 |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/ExemptCodeSectionTxt | 0 | 501(c)(3) |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/LegalDomicileStateCd | 0 | MA |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/PrimaryActivitiesTxt | 0 | College |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/PublicCharityStatusTxt | 0 | Line 2 |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/USAddress/AddressLine1Txt | 0 | 124 Mount Auburn Street |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/USAddress/CityNm | 0 | Cambridge |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/USAddress/ZIPCd | 0 | 02138 |
| IRS990ScheduleR/LoansOrGuaranteesFromOthOrgInd | 0 | 0 |
| IRS990ScheduleR/LoansOrGuaranteesToOtherOrgInd | 0 | 0 |
| IRS990ScheduleR/PaidEmployeesSharingInd | 0 | 0 |
| IRS990ScheduleR/PerformOfServicesByOtherOrgInd | 0 | 0 |
| IRS990ScheduleR/PerformOfServicesForOthOrgInd | 0 | 0 |
| IRS990ScheduleR/ReceiptOfIntAnntsRntsRyltsInd | 0 | 0 |
| IRS990ScheduleR/ReimbursementPaidByOtherOrgInd | 0 | 0 |
| IRS990ScheduleR/ReimbursementPaidToOtherOrgInd | 0 | 0 |
| IRS990ScheduleR/RentalOfFacilitiesToOthOrgInd | 0 | 0 |
| IRS990ScheduleR/RentalOfFcltsFromOthOrgInd | 0 | 0 |
| IRS990ScheduleR/SharingOfFacilitiesInd | 0 | 0 |
| IRS990ScheduleR/TransferFromOtherOrgInd | 0 | 0 |
| IRS990ScheduleR/TransferToOtherOrgInd | 0 | 0 |
| IRS990/SchoolOperatingInd | 0 | 0 |
| IRS990/SignificantChangeInd | 0 | 0 |
| IRS990/SignificantNewProgramSrvcInd | 0 | 0 |
| IRS990/StatesWhereCopyOfReturnIsFldCd | 0 | MA |
| IRS990/SubjectToExcsTaxNetInvstIncInd | 0 | 0 |
| IRS990/SubjectToProxyTaxInd | 0 | 0 |
| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | 0 |
| IRS990/TaxablePartyNotificationInd | 0 | 0 |
| IRS990/TaxExemptBondsInd | 0 | 0 |
| IRS990/TaxExemptInterestAmt | 0 | 0 |
| IRS990/TerminateOperationsInd | 0 | 0 |
| IRS990/TotalAssetsBOYAmt | 0 | 2618523 |
| IRS990/TotalAssetsEOYAmt | 0 | 2843533 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 2618523 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 2843533 |
| IRS990/TotalCompGreaterThan150KInd | 0 | 0 |
| IRS990/TotalEmployeeCnt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/ManagementAndGeneralAmt | 0 | 25058 |
| IRS990/TotalFunctionalExpensesGrp/ProgramServicesAmt | 0 | 91181 |
| IRS990/TotalFunctionalExpensesGrp/TotalAmt | 0 | 116239 |
| IRS990/TotalGrossUBIAmt | 0 | 0 |
| IRS990/TotalLiabilitiesBOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesEOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesGrp/BOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990/TotalNetAssetsFundBalanceGrp/BOYAmt | 0 | 2618523 |
| IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt | 0 | 2843533 |
| IRS990/TotalOtherCompensationAmt | 0 | 0 |
| IRS990/TotalProgramServiceExpensesAmt | 0 | 91181 |
| IRS990/TotalReportableCompFromOrgAmt | 0 | 0 |
| IRS990/TotalRevenueGrp/ExclusionAmt | 0 | 680157 |
| IRS990/TotalRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 0 |
| IRS990/TotalRevenueGrp/TotalRevenueColumnAmt | 0 | 680157 |
| IRS990/TotalRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/TotalVolunteersCnt | 0 | 5 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/BOYAmt | 0 | 2618523 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/EOYAmt | 0 | 2843533 |
| IRS990/TotReportableCompRltdOrgAmt | 0 | 0 |
| IRS990/TrnsfrExmptNonChrtblRltdOrgInd | 0 | 0 |
| IRS990/TypeOfOrganizationTrustInd | 0 | X |
| IRS990/UnrelatedBusIncmOverLimitInd | 0 | 0 |
| IRS990/UponRequestInd | 0 | X |
| IRS990/USAddress/AddressLine1Txt | 0 | Choate LLP POBox 961019 |
| IRS990/USAddress/CityNm | 0 | Boston |
| IRS990/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/USAddress/ZIPCd | 0 | 02196 |
| IRS990/VotingMembersGoverningBodyCnt | 0 | 5 |
| IRS990/VotingMembersIndependentCnt | 0 | 5 |
| IRS990/WebsiteAddressTxt | 0 | N/A |
| IRS990/WhistleblowerPolicyInd | 0 | 0 |
| ReturnHeader/BuildTS | 0 | 2025-03-06 01:10:19Z |
| ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd | 0 | 1 |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | Renat V Lumpau |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | Trustee |
| ReturnHeader/BusinessOfficerGrp/PhoneNum | 0 | 6172485255 |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2025-12-16 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | Isabella M Weld Trust Dated 3311910 |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | WELD |
| ReturnHeader/Filer/EIN | 0 | 046016348 |
| ReturnHeader/Filer/PhoneNum | 0 | 6172485255 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | Choate LLP POBox 961019 |
| ReturnHeader/Filer/USAddress/CityNm | 0 | Boston |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | MA |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 02196 |
| ReturnHeader/IRSResponsiblePrtyInfoCurrInd | 0 | 0 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmEIN | 0 | 010494526 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt | 0 | Baker Newman & Noyes |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt | 0 | PO Box 507 |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm | 0 | Portland |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd | 0 | ME |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd | 0 | 04112 |
| ReturnHeader/PreparerPersonGrp/PhoneNum | 0 | 8002447444 |
| ReturnHeader/PreparerPersonGrp/PreparationDt | 0 | 2025-12-16 |
| ReturnHeader/PreparerPersonGrp/PreparerPersonNm | 0 | Connor Smart |
| ReturnHeader/ReturnTs | 0 | 2026-01-13T10:30:18-06:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990 |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2024-10-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2025-09-30 |
| ReturnHeader/TaxYr | 0 | 2024 |
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