Liabilities / Assets
65th percentile
Higher debt load relative to assets than 65% of similar nonprofits.
EIN 94-3027663 • 501(c)3 • Corte Madera, CA
Profile
Conservation education & interpretation of Mt Tamalpais State Park
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
65th percentile
Higher debt load relative to assets than 65% of similar nonprofits.
Liabilities / Revenue
72nd percentile
Higher debt load relative to revenue than 72% of similar nonprofits.
Net Margin
78th percentile
Higher net margin than 78% of similar nonprofits.
Top Officer Pay
81st percentile
Higher top officer pay than 81% of similar nonprofits.
Top officer pay equals 0.0% of source-year revenue.
Asset Growth
67th percentile
Faster asset growth than 67% of similar nonprofits.
Revenue Growth
69th percentile
Faster revenue growth than 69% of similar nonprofits.
Assets
Up$271,331
Up $23,203 (+9.4%) from 2024
Liabilities
Up$1,608
Up $468 (+41%) from 2024
Net Assets
Up$269,723
Up $22,735 (+9.2%) from 2024
Revenue
Up$92,116
Up $12,999 (+16%) from 2024
Expenses
Up$69,381
Up $34,001 (+96%) from 2024
Net Income
Down$22,735
Down $21,002 (-48%) from 2024
Most recent year
2025 • Form 990EZDetailed filing. Detailed filing data is available for this year.
Conservation education & interpretation of Mt Tamalpais State Park
| Description | Grants | Expenses |
|---|---|---|
| Friends of Mt Tam sponsors hikes ranger programs trail maintenance and education interpretation events free to the public. | $0 | $3,225 |
| Friends of Mt Tam sponsors Annual Meeting Annual Picnic and other events for members and volunteers | $0 | $770 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Brian Muir | President | PT | $0 | - | - |
| Eileen Bai | Vice President | PT | $0 | - | - |
| Amy Palmer | Secretary | PT | $0 | - | - |
| Jennifer Lien | Treasurer | PT | $0 | - | - |
| Janet Rostad | Gravity CAR Barn Program Coordinator | PT | $0 | - | - |
“| Other Revenues:, Amount:| Interest Income $4,808.00, $4808| Insurance Claim Proceeds, $2810|”
“| Other Expenses:, Amount:| Direct Cost of Events, $3995| Bad Debt, $3696| Bank and Merchant Fees, $2571| Computer Software, $465| Dues and Fees, $603| Insurance, $3271| Meals and Gifts, $211| Promotion and Exhibits, $823| Supplies and Tools, $1515| Website Fees, $144| Contributions, $28217| Auto, $296|”
“| Explanation:, BOYAmount:, EOYAmount:| Inventory, $37672, $63427|”
“| Explanation:, BOYAmount:, EOYAmount:| Total Liabilities: Sales Tax Payable, $1140, $1608|”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990EZ/ActivitiesNotPreviouslyRptInd | 0 | false |
| IRS990EZ/BenefitsPaidToOrForMembersAmt | 0 | 0 |
| IRS990EZ/BooksInCareOfDetail/PersonNm | 0 | Linda Futrell |
| IRS990EZ/BooksInCareOfDetail/PhoneNum | 0 | 4156520480 |
| IRS990EZ/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 7 Lower Via Casitas |
| IRS990EZ/BooksInCareOfDetail/USAddress/CityNm | 0 | Greenbrae |
| IRS990EZ/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990EZ/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 94904 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/BOYAmt | 0 | 210456 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/EOYAmt | 0 | 207904 |
| IRS990EZ/ChgMadeToOrgnzngDocNotRptInd | 0 | false |
| IRS990EZ/ContributionsGiftsGrantsEtcAmt | 0 | 35921 |
| IRS990EZ/CostOfGoodsSoldAmt | 0 | 42247 |
| IRS990EZ/DirectIndirectPltclExpendAmt | 0 | 0 |
| IRS990EZ/DonorAdvisedFndsInd | 0 | false |
| IRS990EZ/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990EZ/ExcessOrDeficitForYearAmt | 0 | 22735 |
| IRS990EZ/FeesAndOtherPymtToIndCntrctAmt | 0 | 15600 |
| IRS990EZ/FiledScheduleAInd | 0 | true |
| IRS990EZ/ForeignFinancialAccountInd | 0 | false |
| IRS990EZ/ForeignOfficeInd | 0 | false |
| IRS990EZ/Form1120PolFiledInd | 0 | false |
| IRS990EZ/Form990TotalAssetsGrp/BOYAmt | 0 | 248128 |
| IRS990EZ/Form990TotalAssetsGrp/EOYAmt | 0 | 271331 |
| IRS990EZ/FundraisingGrossIncomeAmt | 0 | 7315 |
| IRS990EZ/GainOrLossFromSaleOfAssetsAmt | 0 | 0 |
| IRS990EZ/GrossProfitLossSlsOfInvntryAmt | 0 | 32325 |
| IRS990EZ/GrossReceiptsAmt | 0 | 138826 |
| IRS990EZ/GrossSalesOfInventoryAmt | 0 | 74572 |
| IRS990EZ/InfoInScheduleOPartIIInd | 0 | X |
| IRS990EZ/InfoInScheduleOPartIInd | 0 | X |
| IRS990EZ/LobbyingActivitiesInd | 0 | false |
| IRS990EZ/MadeLoansToFromOfficersInd | 0 | false |
| IRS990EZ/MembershipDuesAmt | 0 | 13400 |
| IRS990EZ/MethodOfAccountingCashInd | 0 | X |
| IRS990EZ/NetAssetsOrFundBalancesBOYAmt | 0 | 246988 |
| IRS990EZ/NetAssetsOrFundBalancesEOYAmt | 0 | 269723 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/BOYAmt | 0 | 246988 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/EOYAmt | 0 | 269723 |
| IRS990EZ/OccupancyRentUtltsAndMaintAmt | 0 | 6362 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 0 | 5 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 1 | 5 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 2 | 5 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 3 | 5 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 4 | 5 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 4 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 4 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 4 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 0 | Brian Muir |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 1 | Eileen Bai |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 2 | Amy Palmer |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 3 | Jennifer Lien |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 4 | Janet Rostad |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 0 | President |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 1 | Vice President |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 2 | Secretary |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 3 | Treasurer |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 4 | Gravity Car Barn Program Coordinator |
| IRS990EZ/OperateHospitalInd | 0 | false |
| IRS990EZ/Organization501c3Ind | 0 | X |
| IRS990EZ/OrganizationDissolvedEtcInd | 0 | false |
| IRS990EZ/OrganizationHadUBIInd | 0 | false |
| IRS990EZ/OtherAssetsTotalDetail/BOYAmt | 0 | 37672 |
| IRS990EZ/OtherAssetsTotalDetail/EOYAmt | 0 | 63427 |
| IRS990EZ/OtherExpensesTotalAmt | 0 | 45807 |
| IRS990EZ/OtherRevenueTotalAmt | 0 | 7618 |
| IRS990EZ/PartVIHghstPdCntrctProfSrvcTxt | 0 | NONE |
| IRS990EZ/PartVIOfCompOfHghstPdEmplTxt | 0 | NONE |
| IRS990EZ/PoliticalCampaignActyInd | 0 | false |
| IRS990EZ/PrimaryExemptPurposeTxt | 0 | Conservation education & interpretation of Mt Tamalpais State Park |
| IRS990EZ/PrintingPublicationsPostageAmt | 0 | 1612 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/DescriptionProgramSrvcAccomTxt | 0 | Friends of Mt Tam sponsors hikes ranger programs trail maintenance and education interpretation events free to the public. |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/DescriptionProgramSrvcAccomTxt | 1 | Friends of Mt Tam sponsors Annual Meeting Annual Picnic and other events for members and volunteers |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/GrantsAndAllocationsAmt | 0 | 0 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/GrantsAndAllocationsAmt | 1 | 0 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/ProgramServiceExpensesAmt | 0 | 3225 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/ProgramServiceExpensesAmt | 1 | 770 |
| IRS990EZ/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990EZ/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990EZ/SalariesOtherCompEmplBnftAmt | 0 | 0 |
| IRS990EZ/ScheduleBNotRequiredInd | 0 | X |
| IRS990EZ/SchoolOperatingInd | 0 | false |
| IRS990EZ/SpecialEventsDirectExpensesAmt | 0 | 4463 |
| IRS990EZ/SpecialEventsNetIncomeLossAmt | 0 | 2852 |
| IRS990EZ/StatesWhereCopyOfReturnIsFldCd | 0 | CA |
| IRS990EZ/SubjectToProxyTaxInd | 0 | false |
| IRS990EZ/SumOfTotalLiabilitiesGrp/BOYAmt | 0 | 1140 |
| IRS990EZ/SumOfTotalLiabilitiesGrp/EOYAmt | 0 | 1608 |
| IRS990EZ/TanningServicesProvidedInd | 0 | false |
| IRS990EZ/TotalExpensesAmt | 0 | 69381 |
| IRS990EZ/TotalProgramServiceExpensesAmt | 0 | 3995 |
| IRS990EZ/TotalRevenueAmt | 0 | 92116 |
| IRS990EZ/TransactionWithControlEntInd | 0 | false |
| IRS990EZ/TrnsfrExmptNonChrtblRltdOrgInd | 0 | false |
| IRS990EZ/TypeOfOrganizationCorpInd | 0 | X |
| IRS990EZ/WebsiteAddressTxt | 0 | www.friendsofmttam.org |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/ExplanationTxt | 0 | | Year:, Amount:, Description:| 2025, 2810Insurance Claim Proceeds| |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/FormAndLineReferenceDesc | 0 | Part III - Line 12 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearAmt | 0 | 53401 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus1YearAmt | 0 | 47840 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 53024 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 75670 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 18620 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/TotalAmt | 0 | 248555 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearAmt | 0 | 4808 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | 4863 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 755 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 84 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 2870 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/TotalAmt | 0 | 13380 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearAmt | 0 | 77807 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus1YearAmt | 0 | 64467 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus2YearsAmt | 0 | 54591 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus3YearsAmt | 0 | 38382 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus4YearsAmt | 0 | 40141 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/TotalAmt | 0 | 275388 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearAmt | 0 | 4808 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus1YearAmt | 0 | 4863 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 755 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 84 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 2870 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/TotalAmt | 0 | 13380 |
| IRS990ScheduleA/InvestmentIncomeCYPct | 0 | 0.0243 |
| IRS990ScheduleA/InvestmentIncomePYPct | 0 | 0.0197 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearAmt | 0 | 2810 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 10000 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/TotalAmt | 0 | 12810 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/PubliclySupportedOrg509a2Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY509Pct | 0 | 0.9524 |
| IRS990ScheduleA/PublicSupportPY509Pct | 0 | 0.9578 |
| IRS990ScheduleA/PublicSupportTotal509Amt | 0 | 523943 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY509Ind | 0 | X |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearAmt | 0 | 131208 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus1YearAmt | 0 | 112307 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 107615 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 114052 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 58761 |
| IRS990ScheduleA/Total509Grp/TotalAmt | 0 | 523943 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearAmt | 0 | 138826 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus1YearAmt | 0 | 117170 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus2YearsAmt | 0 | 118370 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus3YearsAmt | 0 | 114136 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus4YearsAmt | 0 | 61631 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/TotalAmt | 0 | 550133 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | | Other Revenues:, Amount:| Interest Income $4,808.00, $4808| Insurance Claim Proceeds, $2810| |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | | Other Expenses:, Amount:| Direct Cost of Events, $3995| Bad Debt, $3696| Bank and Merchant Fees, $2571| Computer Software, $465| Dues and Fees, $603| Insurance, $3271| Meals and Gifts, $211| Promotion and Exhibits, $823| Supplies and Tools, $1515| Website Fees, $144| Contributions, $28217| Auto, $296| |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | | Explanation:, BOYAmount:, EOYAmount:| Inventory, $37672, $63427| |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | | Explanation:, BOYAmount:, EOYAmount:| Total Liabilities: Sales Tax Payable, $1140, $1608| |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Part I, line 8 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Part I, line 16 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Part II, line 24 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Part II, line 26 |
| ReturnHeader/BuildTS | 0 | 2025-03-06 01:10:19Z |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | Linda |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | Futrell |
| ReturnHeader/BusinessOfficerGrp/PhoneNum | 0 | 4156520480 |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2026-01-29 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | FRIENDS OF MT TAM |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | FRIE |
| ReturnHeader/Filer/EIN | 0 | 943027663 |
| ReturnHeader/Filer/ForeignPhoneNum | 0 | 4152582410 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | PO BOX 7064 |
| ReturnHeader/Filer/USAddress/CityNm | 0 | CORTE MADERA |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | CA |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 949767064 |
| ReturnHeader/ReturnTs | 0 | 2026-01-26T12:12:31-05:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990EZ |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2025-01-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2025-12-31 |
| ReturnHeader/TaxYr | 0 | 2025 |
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