Liabilities / Assets
16th percentile
Higher debt load relative to assets than 16% of similar nonprofits.
EIN 04-3150560 • 501(c)3 • Boston, MA
Profile
The boston public library fund (library fund) provides financial support to the boston public library (bpl), ensuring that it remains viable, engaging, accessible, and free to all. The library fund fulfills this mission by working in partnership with donors and other funders in making grants to support bpl programs and special initiatives. Funding from the library fund supplements, but does not supplant, other bpl resources, including city of boston funding.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
16th percentile
Higher debt load relative to assets than 16% of similar nonprofits.
Liabilities / Revenue
13th percentile
Higher debt load relative to revenue than 13% of similar nonprofits.
Net Margin
77th percentile
Higher net margin than 77% of similar nonprofits.
Top Officer Pay
Score unavailable
No filing with officer rows is available for this organization yet.
Asset Growth
71st percentile
Faster asset growth than 71% of similar nonprofits.
Revenue Growth
82nd percentile
Faster revenue growth than 82% of similar nonprofits.
Assets
Up$14,036,529
Up $1,589,816 (+13%) from 2024
Liabilities
Down$141,635
Down $747,188 (-84%) from 2024
Net Assets
Up$13,894,894
Up $2,337,004 (+20%) from 2024
Revenue
Up$7,541,977
Up $1,918,694 (+34%) from 2024
Expenses
Up$5,757,405
Up $760,397 (+15%) from 2024
Net Income
Up$1,784,572
Up $1,158,297 (+185%) from 2024
Most recent year
2025 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
The boston public library foundation (library foundation) provides financial support to the boston public library (bpl), ensuring that it remains viable, engaging, accessible, and free to all. The library foundation fulfills this mission by working in partnership with donors and other funders in making grants to support bpl programs and special initiatives. Funding from the library foundation supplements, but does not supplant, other bpl resources, including city of boston funding.
The boston public library fund provides financial support to the boston public library.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments in Publicly Traded Securities | $9,831,598 | $10,948,214 | ▲ $1,116,616 |
| Pledges and Grants Receivable | $847,457 | $2,019,844 | ▲ $1,172,387 |
| Savings and Temporary Cash Investments | $701,005 | $673,370 | ▼ $27,635 |
| Cash and Non-Interest-Bearing Accounts | $1,054,856 | $388,312 | ▼ $666,544 |
| Land, Buildings, and Equipment, Net | $9,409 | $6,045 | ▼ $3,364 |
| Prepaid Expenses and Deferred Charges | $2,388 | $744 | ▼ $1,644 |
| Total Assets | $12,446,713 | $14,036,529 | ▲ $1,589,816 |
| Liabilities | |||
| Other Liabilities | $815,801 | $0 | ▼ $815,801 |
| Accounts Payable and Accrued Expenses | $73,022 | $141,635 | ▲ $68,613 |
| Total Liabilities | $888,823 | $141,635 | ▼ $747,188 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $8,128,948 | $8,239,433 | ▲ $110,485 |
| Net Assets With Donor Restrictions | $3,428,942 | $5,655,461 | ▲ $2,226,519 |
| Total Net Assets Fund Balance | $11,557,890 | $13,894,894 | ▲ $2,337,004 |
| Total Liabilities and Net Assets / Fund Balance | $12,446,713 | $14,036,529 | ▲ $1,589,816 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Other Land Buildings | $6,045 | $30,825 | $36,870 |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $2,591,760 | $61,106 | ▲ $302,955 | - | $2,861,304 |
| 2023 | $1,621,115 | $794,750 | ▲ $257,328 | - | $2,591,760 |
| 2022 | $1,490,131 | - | ▲ $168,696 | - | $1,621,115 |
| 2021 | $1,852,059 | - | ▼ $275,566 | - | $1,490,131 |
| 2020 | $1,622,484 | - | ▲ $314,475 | - | $1,852,059 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Paula Sakey | Executive Director | FT | $259,315 | $74,687 | $334,002 |
| Carol Estes-schwartz | Director of Philanthropy and Legacy Giving | FT | $150,911 | $63,053 | $213,964 |
| Carol Estes-schwartz | Director of Philanthropy and Legacy | - | $145,911 | $68,053 | $213,964 |
| Sarah Dow | Director of Advancement Services | FT | $112,654 | $11,083 | $123,737 |
| Name | Title |
|---|---|
| Jeffrey B Hawkins | Chair |
| Taylor Brennan | President, Emerging Leaders |
| Hannah Grove | Vice Chair |
| Adrienne Zak Hunt | Director |
| Amelia Mccarthy | Director |
| Barry Canton | Director |
| Cliff Cammock | Director |
| Cynthia Clark | Director |
| David Leonard | Director |
| Derrick Johns | Director |
| Douglas Carney | Director |
| Leo Liu | Director |
| Merranda Logan | Director |
| Michael Keating | Director |
| Raymond Liu | Director |
| Grace Fey | Founding Director Emeritus |
| Lewis Burleigh | Founding Director Emeritus |
| Louis Maiuri | Treasurer |
| Contribution Type | Contribution Count | Reported Amount | Valuation Method |
|---|---|---|---|
| Other Non Cash Contri Table | 131 | $84,239 | Discounted Estimated |
| Securities Publicly Traded | 8 | $15,567 | Fair Market Value (FMV) |
| Works of Art | 1 | $2,600 | Fair Market Value (FMV) |
| Total Noncash Contributions | 140 | $102,406 | - |
| Line Item | Amount |
|---|---|
| Grants and Similar Amounts Paid | $3,646,334 |
| Salaries, Compensation, and Employee Benefits | $1,456,967 |
| Total Fundraising Expense | $1,053,200 |
| Other Expenses | $439,664 |
| Professional Fundraising Fees | $214,440 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Grants to Domestic Orgs | $3,646,334 | - | - | $3,646,334 |
| Other Salaries and Wages | - | $460,622 | $235,562 | $696,184 |
| Current Officers, Directors, Trustees, and Key Employees | - | $191,923 | $398,424 | $590,347 |
| Fees for Services Professional Fundraising | - | - | $214,440 | $214,440 |
| Office Expenses | - | $73,442 | $63,229 | $136,671 |
| Fees for Services Accounting | - | $100,000 | - | $100,000 |
| Payroll Taxes | - | $53,102 | $46,055 | $99,157 |
| Fees for Services Other | - | $54,490 | - | $54,490 |
| Information Technology | - | $35,753 | $10,620 | $46,373 |
| Other Employee Benefits | - | $23,480 | $21,963 | $45,443 |
| Pension Plan Contributions | - | $17,561 | $8,275 | $25,836 |
| Fees for Service Investment Mgmnt Fees | - | $19,008 | - | $19,008 |
| Other Expenses | - | $9,994 | $36,834 | $9,994 |
| Advertising | - | - | $9,332 | $9,332 |
| Insurance | - | - | $5,102 | $5,102 |
| Conferences and Meetings | - | $3,976 | - | $3,976 |
| Depreciation Depletion | - | - | $3,364 | $3,364 |
| Total Functional Expenses | $3,646,334 | $1,057,871 | $1,053,200 | $5,757,405 |
| Line Item | Amount |
|---|---|
| Total Expenses per Audited Statements | $5,936,642 |
| Total Expenses per Form 990 | $5,757,405 |
| Expenses per Audited Statements | $5,738,397 |
| Expenses Not Reported on Form 990 | $198,245 |
| Expenses Not Reported on Financial Statements | $19,008 |
| Recipient | Location | Category | Purpose | Amount |
|---|---|---|---|---|
| Boston Public Library | Boston, MA | 501(c)(3) | Support Bpl Programs | $3,646,334 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $214,440 |
| Fundraising Direct Expenses | $148,836 |
| Fundraising Gross Income | $51,600 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Marathon | $243,711 | - | $27,238 | - |
| Night in the Stacks | $245,313 | $51,600 | $3,305 | $48,295 |
| Total Events | $489,024 | $51,600 | $148,836 | $-97,236 |
“A draft of the form 990 was reviewed and approved by the executive committee of the board of directors before it was filed.”
“Board members sign a conflict of interest form annually. If a potential conflict should arise, the individual involved would be restricted from discussing and/or voting on the transaction which the conflict relates to.”
“The board chair, in consultation with lindauer nonprofit executive search, set the executive director's compensation based on market comparables. This was done in 2018 and reviewed again in 2021.”
“All information is available to the public upon request.”
“Endowment funds are held to generate income to be used to support teen programs, parochial school partnerships, children's music programs, and the martel fund for children's programs.”
“The fund accounts for uncertain tax positions in accordance with fasb asc topic income taxes. The topic prescribes a recognition threshold and measurement process for financial statement recognition of uncertain tax positions taken or expected to be taken in a tax return. This topic also provides guidance on recognition, derecognition, classification, interest and penalties, accounting in interim periods, disclosure and transition. At june 30, 2025 and 2024, management believes that the fund has no material uncertain tax positions.”
“Direct fundraising event expenses 148,836.”
“Direct fundraising event expenses 148,836.”
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 | 73022 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 141635 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | THE BOSTON PUBLIC LIBRARY FUND PROVIDES FINANCIAL SUPPORT TO THE BOSTON PUBLIC LIBRARY. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 9332 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 9332 |
| IRS990/AllOtherContributionsAmt | 0 | 6544929 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | PAULA SAKEY |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6178592029 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 700 BOYLSTON STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BOSTON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02116 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 1054856 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 388312 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 398424 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 191923 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 590347 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 3976 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 3976 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 1 |
| IRS990/ContriRptFundraisingEventAmt | 0 | 437424 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 6982353 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 3646334 |
| IRS990/CYInvestmentIncomeAmt | 0 | 656835 |
| IRS990/CYOtherExpensesAmt | 0 | 439664 |
| IRS990/CYOtherRevenueAmt | 0 | -97211 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 1784572 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1456967 |
| IRS990/CYTotalExpensesAmt | 0 | 5757405 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 1053200 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 214440 |
| IRS990/CYTotalRevenueAmt | 0 | 7541977 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 1 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 3364 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 3364 |
| IRS990/Desc | 0 | FUNDS WERE PROVIDED TO THE BOSTON PUBLIC LIBRARY FOR VARIOUS PROGRAM GRANTS TO SUPPORT THE MISSION OF THE BOSTON PUBLIC LIBRARY. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 3428942 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 5655461 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 13 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 3646334 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 100000 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 100000 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 54490 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 54490 |
| IRS990/FeesForServicesProfFundraising/FundraisingAmt | 0 | 214440 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 214440 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 19008 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 19008 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 12 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 13 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 14 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 15 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 16 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 17 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 18 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 19 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 20 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 0.10 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | 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/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 49687 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 63053 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 11083 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | JEFFREY B HAWKINS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | HANNAH GROVE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | LOUIS MAIURI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | TAYLOR BRENNAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | LEWIS BURLEIGH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | GRACE FEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | CLIFF CAMMOCK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | BARRY CANTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | CYNTHIA CLARK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | ADRIENNE ZAK HUNT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | DERRICK JOHNS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | MICHAEL KEATING |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | DAVID LEONARD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | MERRANDA LOGAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | RAYMOND LIU |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | LEO LIU |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | AMELIA MCCARTHY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | DOUGLAS CARNEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | PAULA SAKEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | CAROL ESTES-SCHWARTZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | SARAH DOW |
| 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 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 284315 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 150911 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 112654 |
| 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/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | PRESIDENT, EMERGING LEADERS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | FOUNDING DIRECTOR EMERITUS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | FOUNDING DIRECTOR EMERITUS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | EXECUTIVE DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | DIRECTOR OF PHILANTHROPY AND LEGACY GIVING |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | DIRECTOR OF ADVANCEMENT SERVICES |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1992 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/ConsolAndSepBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 437424 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 148836 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 51600 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 410519 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 15 |
| IRS990/GrantAmt | 0 | 3646334 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 3646334 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 3646334 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 1 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 6179556 |
| IRS990/GrossReceiptsAmt | 0 | 13459850 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 15 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 10620 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 35753 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 46373 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 5102 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 5102 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 246316 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 246316 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 9831598 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 10948214 |
| IRS990/IRPDocumentCnt | 0 | 9 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 30825 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 9409 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 6045 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 36870 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 5769037 |
| 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/MiscellaneousRevenueGrp/ExclusionAmt | 0 | 25 |
| IRS990/MiscellaneousRevenueGrp/TotalRevenueColumnAmt | 0 | 25 |
| IRS990/MissionDesc | 0 | THE BOSTON PUBLIC LIBRARY FUND PROVIDES FINANCIAL SUPPORT TO THE BOSTON PUBLIC LIBRARY (BPL), ENSURING THAT IT REMAINS VIABLE, ENGAGING, ACCESSIBLE, AND FREE TO ALL. THE LIBRARY FUND FULFILLS THIS MISSION BY WORKING IN PARTNERSHIP WITH DONORS AND OTHER FUNDERS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 11557890 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 13894894 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 410519 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 410519 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | -97236 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | -97236 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 552432 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 8128948 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 8239433 |
| IRS990/NoncashContributionsAmt | 0 | 102406 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 63229 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 73442 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 136671 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 21963 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 23480 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 45443 |
| IRS990/OtherExpensesGrp/Desc | 0 | STEWARDSHIP |
| IRS990/OtherExpensesGrp/Desc | 1 | EVENT EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 2 | TRAINING |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 36834 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 14520 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 9994 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 36834 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 14520 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 9994 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 815801 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990/OtherRevenueTotalAmt | 0 | 25 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 235562 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 460622 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 696184 |
| IRS990/OtherWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 46055 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 53102 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 99157 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 8275 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 17561 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 25836 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 847457 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 2019844 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 2388 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 744 |
| IRS990/PrincipalOfficerNm | 0 | PAULA SAKEY |
| IRS990/ProfessionalFundraisingInd | 0 | 1 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 5362152 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 3223326 |
| IRS990/PYInvestmentIncomeAmt | 0 | 304707 |
| IRS990/PYOtherExpensesAmt | 0 | 404865 |
| IRS990/PYOtherRevenueAmt | 0 | -43576 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 626275 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1241417 |
| IRS990/PYTotalExpensesAmt | 0 | 4997008 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 127400 |
| IRS990/PYTotalRevenueAmt | 0 | 5623283 |
| IRS990/QuidProQuoContributionsInd | 0 | 1 |
| IRS990/QuidProQuoContriDisclInd | 0 | 1 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 1784572 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 1 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 701005 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 673370 |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/ExplanationTxt | 0 | MISCELLANEOUS INCOME - 2024 AMOUNT: $ 25. |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/FormAndLineReferenceDesc | 0 | SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME: |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 6982353 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 5362152 |
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