Liabilities / Assets
75th percentile
Higher debt load relative to assets than 75% of similar nonprofits.
Precomputed percentiles for this filing year versus similar nonprofits in the same peer cohort.
Liabilities / Assets
75th percentile
Higher debt load relative to assets than 75% of similar nonprofits.
Liabilities / Revenue
75th percentile
Higher debt load relative to revenue than 75% of similar nonprofits.
Net Margin
65th percentile
Higher net margin than 65% of similar nonprofits.
Top Officer Pay
77th percentile
Higher top officer pay than 77% of similar nonprofits.
Top officer pay equals 4.4% of source-year revenue.
Asset Growth
60th percentile
Faster asset growth than 60% of similar nonprofits.
Revenue Growth
44th percentile
Faster revenue growth than 44% of similar nonprofits.
Assets
Up$10,068,626
Up $867,922 (+9.4%) from 2022
Net Assets
Up$5,183,204
Up $710,896 (+16%) from 2022
Liabilities
Up$4,885,422
Up $157,026 (+3.3%) from 2022
Revenue
Up$6,530,236
Up $154,190 (+2.4%) from 2022
Expenses
Down$5,819,619
Down $64,820 (-1.1%) from 2022
Net Income
Up$710,617
Up $219,010 (+45%) from 2022
Proof school offers a transformative liberal arts education to young people with an active curiosity and a passion for mathematics, equipping them to reason, communicate, and positively impact their world.
Offering a liberal arts education for kids who love math, reasoning and communication.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Rtn Earn Endowment Incm Other Fnds | $4,472,308 | $5,183,204 | ▲ $710,896 |
| Investments in Publicly Traded Securities | $826,758 | $4,294,727 | ▲ $3,467,969 |
| Accounts Receivable | $2,470,562 | $2,646,531 | ▲ $175,969 |
| Land, Buildings, and Equipment, Net | $1,731,876 | $1,490,569 | ▼ $241,307 |
| Cash and Non-Interest-Bearing Accounts | $3,893,736 | $812,654 | ▼ $3,081,082 |
| Savings and Temporary Cash Investments | $0 | $550,002 | ▲ $550,002 |
| Prepaid Expenses and Deferred Charges | $34,990 | $34,143 | ▼ $847 |
| Pd in Cap Srpls Land Bldg Eqp Fund | $0 | $0 | → $0 |
| Cap Stk Tr Prin Current Funds | $0 | $0 | → $0 |
| Total Assets | $9,200,704 | $10,068,626 | ▲ $867,922 |
| Other Assets Total | $242,782 | $240,000 | ▼ $2,782 |
| Liabilities | |||
| Deferred Revenue | $4,365,730 | $4,561,890 | ▲ $196,160 |
| Other Liabilities | $326,978 | $282,404 | ▼ $44,574 |
| Accounts Payable and Accrued Expenses | $35,688 | $41,128 | ▲ $5,440 |
| Total Liabilities | $4,728,396 | $4,885,422 | ▲ $157,026 |
| Net Assets / Fund Balance | |||
| Total Net Assets Fund Balance | $4,472,308 | $5,183,204 | ▲ $710,896 |
| Total Liabilities and Net Assets / Fund Balance | $9,200,704 | $10,068,626 | ▲ $867,922 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Leasehold Improvements | $1,445,727 | $1,327,088 | $2,772,815 |
| Equipment | $44,842 | $49,845 | $94,687 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Samuel Vandervelde | Head of School | FT | $244,080 | $43,660 | $287,740 |
| Zachary Sifuentes | Dean of Humanities | FT | $210,489 | $36,264 | $246,753 |
| Kathy Lin | Director of Admissions | FT | $219,974 | $11,926 | $231,900 |
| Jason Horowitz | Math & Science Teacher | FT | $106,245 | $17,210 | $123,455 |
| Susan Durst | Math & Music Teacher | FT | $103,917 | $13,795 | $117,712 |
| Name | Title |
|---|---|
| Paul Zeitz | Board Chair |
| Ana Brubaker | Board Member |
| Diviya Magaro | Board Member |
| James Sotiros | Board Member |
| Lisa Park | Board Member |
| Ravi Vakil | Board Member |
| Susan Athey | Board Member |
| Alon Amit | Secretary |
| Perry Tam | Treasurer |
| Contribution Type | Contribution Count | Reported Amount | Valuation Method |
|---|---|---|---|
| Securities Publicly Traded | 4 | $31,649 | Fair Market Value (FMV) |
| Total Noncash Contributions | 4 | $31,649 | - |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $3,179,290 |
| Other Expenses | $1,554,189 |
| Grants and Similar Amounts Paid | $1,086,140 |
| Professional Fundraising Fees | $0 |
| Total Fundraising Expense | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $1,683,106 | $164,166 | - | $1,847,272 |
| Grants to Domestic Individuals | $1,086,140 | - | - | $1,086,140 |
| Occupancy | $692,917 | $195,361 | - | $888,278 |
| Current Officers, Directors, Trustees, and Key Employees | $800,960 | - | - | $800,960 |
| Depreciation Depletion | $219,858 | $62,011 | - | $281,869 |
| Other Employee Benefits | $169,485 | $45,634 | - | $215,119 |
| Payroll Taxes | $163,707 | $12,769 | - | $176,476 |
| Pension Plan Contributions | $109,878 | $29,585 | - | $139,463 |
| Insurance | $25,780 | $7,117 | - | $32,897 |
| Information Technology | $23,488 | $4,554 | - | $28,042 |
| Fees for Services Other | $26,256 | - | - | $26,256 |
| Office Expenses | $20,632 | $2,945 | - | $23,577 |
| Fees for Services Accounting | $7,011 | $1,978 | - | $8,989 |
| Other Expenses | $5,108 | - | - | $5,108 |
| All Other Expenses | $946 | $2,983 | - | $3,929 |
| Fees for Services Legal | - | $806 | - | $806 |
| Interest | - | $146 | - | $146 |
| Total Functional Expenses | $5,289,564 | $530,055 | $0 | $5,819,619 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Liability | Amount |
|---|---|
| Deferred Rent | $282,404 |
“The school will electronically distribute the completed form 990, including any supplemental schedules, to each member of the board of directors (named in part vii section a) before filing. The board will then approve the form 990 via a formal vote.”
“All employees of proof school sign an agreement to observe the conflict of interest policy stated in our employee handbook. Determination and review of conflicts of interest are made by the school leadership team, overseen by the head of school. Such determinations are made initially at the time of hire, and subsequently monitored through an annual review of handbook policies each august, requests for personal time during the year, and informal conversations. No conflicts of interest have been identified to date.”
“Non-compensated board members approves the head of school salary, who in turn sets and publishes internally a compensation scale and promotion policy for all employees. Amounts are based on salaries at comparison schools in our region.”
“Documents may be requested by contacting the head of school, who makes decisions regarding their distribution on a case-by-case basis.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 35688 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 41128 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 2470562 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 2646531 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | OFFERING A LIBERAL ARTS EDUCATION FOR KIDS WHO LOVE MATH, REASONING AND COMMUNICATION. |
| IRS990/AllOtherContributionsAmt | 0 | 803818 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 2983 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 946 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 3929 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | SAMUEL K VANDERVELDE |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 4154265700 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 973 MISSION STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | SAN FRANCISCO |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 94103 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CapStkTrPrinCurrentFundsGrp/BOYAmt | 0 | 0 |
| IRS990/CapStkTrPrinCurrentFundsGrp/EOYAmt | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 3893736 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 812654 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 800960 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 800960 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 803818 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 1086140 |
| IRS990/CYInvestmentIncomeAmt | 0 | 82535 |
| IRS990/CYOtherExpensesAmt | 0 | 1554189 |
| IRS990/CYOtherRevenueAmt | 0 | 1804 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 5642079 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 710617 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 3179290 |
| IRS990/CYTotalExpensesAmt | 0 | 5819619 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 6530236 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 4365730 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 4561890 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 62011 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 219858 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 281869 |
| IRS990/Desc | 0 | PROOF SCHOOL DELIVERED A COMPREHENSIVE MIDDLE AND HIGH SCHOOL CURRICULUM TO A TOTAL OF 117 STUDENTS IN GRADES 6-12 DURING THE 2022-23 ACADEMIC YEAR. SCHOOL WAS IN SESSION FOR 173 DAYS; THE SCHOOL HELD INFO SESSIONS, RAN ADMISSIONS, HIRED THREE NEW FACULTY, AND GRADUATED 17 STUDENTS. THE GOAL FOR THE SCHOOL CONTINUES TO BE TO PROVIDE A WORLD CLASS EDUCATION FOR STUDENTS IN THE BAY AREA WHO LOVE MATH. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 28 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 5289564 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 1978 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 7011 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 8989 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 806 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 806 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 26256 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 26256 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 0.50 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 0.50 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 0.50 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 0.50 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 0.50 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 0.50 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 0.50 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 0.50 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | 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/KeyEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 43660 |
| 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 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 36264 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 11926 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 17210 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 13795 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | SAMUEL VANDERVELDE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | PAUL ZEITZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | PERRY TAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | ALON AMIT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | DIVIYA MAGARO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | JAMES SOTIROS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | RAVI VAKIL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | ANA BRUBAKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | LISA PARK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | SUSAN ATHEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | ZACHARY SIFUENTES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | KATHY LIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | JASON HOROWITZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | SUSAN DURST |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 244080 |
| 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 | 210489 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 219974 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 106245 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 103917 |
| 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/TitleTxt | 0 | HEAD OF SCHOOL |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | BOARD CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DEAN OF HUMANITIES |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR OF ADMISSIONS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | MATH & SCIENCE TEACHER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | MATH & MUSIC TEACHER |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 2013 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedInd | 0 | 0 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 1213 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 10 |
| IRS990/GrantAmt | 0 | 1086140 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 1086140 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 1086140 |
| IRS990/GrantsToIndividualsInd | 0 | 1 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 31649 |
| IRS990/GrossReceiptsAmt | 0 | 6560672 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 9 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 5 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 4554 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 23488 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 28042 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 7117 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 25780 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 32897 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 146 |
| IRS990/InterestGrp/TotalAmt | 0 | 146 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 81322 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 81322 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 826758 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 4294727 |
| IRS990/IRPDocumentCnt | 0 | 8 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 1376933 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1731876 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1490569 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 2867502 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 30436 |
| 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 | PROOF SCHOOL OFFERS A TRANSFORMATIVE LIBERAL ARTS EDUCATION TO YOUNG PEOPLE WITH AN ACTIVE CURIOSITY AND A PASSION FOR MATHEMATICS, EQUIPPING THEM TO REASON, COMMUNICATE, AND POSITIVELY IMPACT THEIR WORLD. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 4472308 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 5183204 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 1213 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 1213 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 279 |
| IRS990/NoncashContributionsAmt | 0 | 31649 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 195361 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 692917 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 888278 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 2945 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 20632 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 23577 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrgDoesNotFollowFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 242782 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 240000 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 45634 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 169485 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 215119 |
| IRS990/OtherExpensesGrp/Desc | 0 | SCHOOL PROGRAMS AND ACT |
| IRS990/OtherExpensesGrp/Desc | 1 | CURRICULAR EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 2 | ADMISSIONS & OUTREACH |
| IRS990/OtherExpensesGrp/Desc | 3 | BAD DEBT |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 192360 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 49600 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 12332 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 5108 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 192360 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 49600 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 12332 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 5108 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 326978 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 282404 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900009 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | OTHER INCOME |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 1804 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 1804 |
| IRS990/OtherRevenueTotalAmt | 0 | 1804 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 164166 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 1683106 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 1847272 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 12769 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 163707 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 176476 |
| IRS990/PdInCapSrplsLandBldgEqpFundGrp/BOYAmt | 0 | 0 |
| IRS990/PdInCapSrplsLandBldgEqpFundGrp/EOYAmt | 0 | 0 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 29585 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 109878 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 139463 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 34990 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 34143 |
| IRS990/PrincipalOfficerNm | 0 | SAMUEL VANDERVELDE |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 611600 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 611710 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 611710 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 3 | 611710 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 4 | 611710 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | TUITION |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | LUNCH INCOME |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | CAMP FEES |
| IRS990/ProgramServiceRevenueGrp/Desc | 3 | FIELD TRIPS |
| IRS990/ProgramServiceRevenueGrp/Desc | 4 | TESTING FEES |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 5500490 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 66400 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 30090 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 3 | 24811 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 4 | 12422 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 5500490 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 66400 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 30090 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 3 | 24811 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 4 | 12422 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 859268 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 1246530 |
| IRS990/PYInvestmentIncomeAmt | 0 | 1408 |
| IRS990/PYOtherExpensesAmt | 0 | 1610738 |
| IRS990/PYOtherRevenueAmt | 0 | 2597 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 5512773 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 491607 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 3027171 |
| IRS990/PYTotalExpensesAmt | 0 | 5884439 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 6376046 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 710617 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 1 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 5643883 |
| IRS990/RtnEarnEndowmentIncmOthFndsGrp/BOYAmt | 0 | 4472308 |
| IRS990/RtnEarnEndowmentIncmOthFndsGrp/EOYAmt | 0 | 5183204 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 0 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 550002 |
| IRS990ScheduleA/SchoolInd | 0 | X |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleD/EquipmentGrp/BookValueAmt | 0 | 44842 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 49845 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 94687 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/BookValueAmt | 0 | 1445727 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/DepreciationAmt | 0 | 1327088 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/OtherCostOrOtherBasisAmt | 0 | 2772815 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 282404 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | DEFERRED RENT |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 1490569 |
| IRS990ScheduleD/TotalLiabilityAmt | 0 | 282404 |
| IRS990ScheduleE/ComplianceWithRevProc7550Ind | 0 | 1 |
| IRS990ScheduleE/DiscriminateRaceAdmissPlcyInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceAthltProgInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceEducPlcyInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceEmplmFcultyInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceOtherActyInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceSchsInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceStdntsRghtsInd | 0 | 0 |
| IRS990ScheduleE/DiscriminateRaceUseOfFcltsInd | 0 | 0 |
| IRS990ScheduleE/GovernmentFinancialAidRcvdInd | 0 | 0 |
| IRS990ScheduleE/GovernmentFinancialAidRvkdInd | 0 | 0 |
| IRS990ScheduleE/MaintainCpyOfAllSolInd | 0 | 1 |
| IRS990ScheduleE/MaintainCpyOfBrochuresEtcInd | 0 | 1 |
| IRS990ScheduleE/MaintainRacialCompRecsInd | 0 | 1 |
| IRS990ScheduleE/MaintainScholarshipsRecsInd | 0 | 1 |
| IRS990ScheduleE/NondiscriminatoryPolicyStmtInd | 0 | 1 |
| IRS990ScheduleE/PlcyPblczdViaBroadcastMediaInd | 0 | 1 |
| IRS990ScheduleE/PolicyStmtInBrochuresEtcInd | 0 | 1 |
| IRS990ScheduleE/SupplementalInformationDetail/ExplanationTxt | 0 | PROOF SCHOOL DOES NOT SOLICIT APPLICATIONS VIA NEWSPAPER OR BROADCAST MEDIA. OUR COMPREHENSIVE RACIAL NONDISCRIMINATION POLICY APPEARS AT THE PROOF SCHOOL WEBSITE ON PAGE CONTAINING INFORMATION ON ADMISSIONS. IT IS ALSO CLEARLY DISPLAYED ON ALL APPLICATION MATERIALS THAT ARE COMPLETED BY FAMILIES IN THE PROCESS OF APPLYING TO PROOF SCHOOL. |
| IRS990ScheduleE/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | SCHEDULE E, PART I, LINE 3 |
| IRS990ScheduleI/GrantRecordsMaintainedInd | 0 | 1 |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/CashGrantAmt | 0 | 1086140 |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/GrantTypeTxt | 0 | FINANCIAL ASSISTANCE |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/RecipientCnt | 0 | 35 |
| IRS990ScheduleI/SupplementalInformationDetail/ExplanationTxt | 0 | ALL FAMILIES HAVE THE OPTION OF APPLYING FOR FINANCIAL ASSISTANCE (FA) AT THE SAME TIME THAT THEY APPLY FOR ADMISSION TO PROOF SCHOOL. THE FA PROCESS IS HANDLED BY SSS, AN INDEPENDENT SERVICE USED BY MANY SCHOOLS TO DETERMINE FINANCIAL ASSISTANCE AWARD AMOUNTS. ONCE A STUDENT IS ADMITTED, OUR FA COMMITTEE USES INFORMATION PROVIDED BY SSS AND BY THE FAMILY IN ORDER TO MAKE FINAL AWARD DETERMINATIONS, WHICH ARE SHARED IN THE ENROLLMENT AGREEMENT. ALL RECORDS RELATED TO FA ARE KEPT ELECTRONICALLY, BOTH VIA SSS AND INTERNALLY. |
| IRS990ScheduleI/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | PART I, LINE 2: |
| IRS990ScheduleJ/AnyNonFixedPaymentsInd | 0 | 0 |
| IRS990ScheduleJ/BoardOrCommitteeApprovalInd | 0 | X |
| IRS990ScheduleJ/CompBasedOnRevenueOfFlngOrgInd | 0 | 0 |
| IRS990ScheduleJ/CompBsdNetEarnsFlngOrgInd | 0 | 0 |
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Displayed year
2023 • Form 990Detailed filing. Detailed filing data is available for this year.