Liabilities / Assets
81st percentile
Higher debt load relative to assets than 81% of similar nonprofits.
Precomputed percentiles for this filing year versus similar nonprofits in the same peer cohort.
Liabilities / Assets
81st percentile
Higher debt load relative to assets than 81% of similar nonprofits.
Liabilities / Revenue
79th percentile
Higher debt load relative to revenue than 79% of similar nonprofits.
Net Margin
56th percentile
Higher net margin than 56% of similar nonprofits.
Top Officer Pay
84th percentile
Higher top officer pay than 84% of similar nonprofits.
Top officer pay equals 4.8% of source-year revenue.
Asset Growth
63rd percentile
Faster asset growth than 63% of similar nonprofits.
Revenue Growth
64th percentile
Faster revenue growth than 64% of similar nonprofits.
Assets
Up$7,842,960
Up $850,503 (+12%) from 2019
Net Assets
Up$3,104,010
Up $374,581 (+14%) from 2019
Liabilities
Up$4,738,950
Up $475,922 (+11%) from 2019
Revenue
Up$5,307,911
Up $442,311 (+9.1%) from 2019
Expenses
Up$4,932,486
Up $403,007 (+8.9%) from 2019
Net Income
Up$375,425
Up $39,304 (+12%) from 2019
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 | $2,729,429 | $3,104,010 | ▲ $374,581 |
| Accounts Receivable | $2,191,878 | $2,418,671 | ▲ $226,793 |
| Land, Buildings, and Equipment, Net | $2,342,127 | $2,208,138 | ▼ $133,989 |
| Cash and Non-Interest-Bearing Accounts | $1,494,513 | $2,199,980 | ▲ $705,467 |
| Investments in Publicly Traded Securities | $550,540 | $611,175 | ▲ $60,635 |
| Loans From Officers Directors | $100,000 | $0 | ▼ $100,000 |
| Prepaid Expenses and Deferred Charges | $53,399 | $32,814 | ▼ $20,585 |
| Pd in Cap Srpls Land Bldg Eqp Fund | $0 | $0 | → $0 |
| Cap Stk Tr Prin Current Funds | $0 | $0 | → $0 |
| Total Assets | $6,992,457 | $7,842,960 | ▲ $850,503 |
| Other Assets Total | $360,000 | $372,182 | ▲ $12,182 |
| Liabilities | |||
| Deferred Revenue | $3,641,135 | $4,016,990 | ▲ $375,855 |
| Unsecured Notes Loans Payable | $0 | $368,800 | ▲ $368,800 |
| Other Liabilities | $480,197 | $342,054 | ▼ $138,143 |
| Accounts Payable and Accrued Expenses | $41,696 | $11,106 | ▼ $30,590 |
| Total Liabilities | $4,263,028 | $4,738,950 | ▲ $475,922 |
| Net Assets / Fund Balance | |||
| Total Net Assets Fund Balance | $2,729,429 | $3,104,010 | ▲ $374,581 |
| Total Liabilities and Net Assets / Fund Balance | $6,992,457 | $7,842,960 | ▲ $850,503 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Leasehold Improvements | $2,173,711 | $527,528 | $2,701,239 |
| Equipment | $34,427 | $22,761 | $57,188 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Samuel K Vandervelde | Head of School | FT | $219,773 | $33,509 | $253,282 |
| Zachary Sifuentes | Dean of Humanities | FT | $183,316 | $27,334 | $210,650 |
| Kathy Lin | Director of Admissions | FT | $189,051 | $6,356 | $195,407 |
| Jason Horowitz | Math & Science Teacher | FT | $101,098 | $11,984 | $113,082 |
| Name | Title |
|---|---|
| Paul Zeitz | Board Chair |
| Alon Amit | Board Member |
| Ana Brubaker | Board Member |
| Diviya Magaro | Board Member |
| James Sotiros | Board Member |
| Lisa Park | Board Member |
| Perry Tam | Board Member |
| Ravi Vakil | Board Member |
| Dennis Leary | Treasurer |
| Contribution Type | Contribution Count | Reported Amount | Valuation Method |
|---|---|---|---|
| Securities Publicly Traded | 3 | $36,175 | Fair Market Value |
| Total Noncash Contributions | 3 | $36,175 | - |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $2,468,656 |
| Other Expenses | $1,402,187 |
| Grants and Similar Amounts Paid | $1,061,643 |
| Total Fundraising Expense | $3,865 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $1,285,751 | $147,878 | - | $1,433,629 |
| Grants to Domestic Individuals | $1,061,643 | - | - | $1,061,643 |
| Occupancy | $690,374 | $189,828 | - | $880,202 |
| Current Officers, Directors, Trustees, and Key Employees | $688,500 | - | - | $688,500 |
| Depreciation Depletion | $220,531 | $62,201 | - | $282,732 |
| Other Employee Benefits | $173,866 | $27,068 | - | $200,934 |
| Payroll Taxes | $133,658 | $11,935 | - | $145,593 |
| Information Technology | $21,528 | $6,638 | - | $28,166 |
| Insurance | $9,246 | $14,907 | - | $24,153 |
| Office Expenses | $11,344 | $6,165 | $1,271 | $18,780 |
| Fees for Services Accounting | $11,743 | $3,549 | - | $15,292 |
| Other Expenses | $1,647 | $2,968 | $1,416 | $6,031 |
| Travel | $5,514 | - | - | $5,514 |
| Advertising | - | - | $154 | $154 |
| Total Functional Expenses | $4,454,444 | $474,177 | $3,865 | $4,932,486 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Line Item | Beginning | End | Change |
|---|---|---|---|
| Loans from Officers, Directors, Trustees, and Key Employees | $100,000 | $0 | ▼ $100,000 |
| Liability | Amount |
|---|---|
| Deferred Rent | $342,054 |
“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.”
“Due to covid-19, the organization had ceased providing services in person and switched to all remote during the 2020 fiscal year.”
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 | 41696 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 11106 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 2191878 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 2418671 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | OFFERING A LIBERAL ARTS EDUCATION FOR KIDS WHO LOVE MATH, REASONING AND COMMUNICATION. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 154 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 154 |
| IRS990/AllOtherContributionsAmt | 0 | 614908 |
| 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 | 1494513 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 2199980 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 688500 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 688500 |
| 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 | 614908 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 1061643 |
| IRS990/CYInvestmentIncomeAmt | 0 | 7852 |
| IRS990/CYOtherExpensesAmt | 0 | 1402187 |
| IRS990/CYOtherRevenueAmt | 0 | 2782 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 4682369 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 375425 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 2468656 |
| IRS990/CYTotalExpensesAmt | 0 | 4932486 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 3865 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 5307911 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 3641135 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 4016990 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 62201 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 220531 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 282732 |
| IRS990/Desc | 0 | PROOF SCHOOL DELIVERED A COMPREHENSIVE MIDDLE OR HIGH SCHOOL CURRICULUM TO A TOTAL OF 111 STUDENTS DURING THE 2019-20 ACADEMIC YEAR. SCHOOL WAS IN SESSION FOR 172 DAYS; THE SCHOOL ALSO HELD TWO SYMPOSIUMS, TWO INFO SESSIONS, ONE MATH FESTIVALS, AND GRADUATED 11 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 | 25 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 4454444 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 3549 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 11743 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 15292 |
| 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 | 3.00 |
| 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/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/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 33509 |
| 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 | 27334 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 6356 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 11984 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | SAMUEL K VANDERVELDE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | PAUL ZEITZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | DENNIS LEARY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | ALON AMIT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | DIVIYA MAGARO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | JAMES SOTIROS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | PERRY TAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | RAVI VAKIL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | ANA BRUBAKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | LISA PARK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | ZACHARY SIFUENTES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | KATHY LIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | JASON HOROWITZ |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 219773 |
| 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 | 183316 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 189051 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 101098 |
| 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/TitleTxt | 0 | HEAD OF SCHOOL |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | BOARD CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | BOARD MEMBER |
| 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/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 2013 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedInd | 0 | 0 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 10 |
| IRS990/GrantAmt | 0 | 1061643 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 1061643 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 1061643 |
| IRS990/GrantsToIndividualsInd | 0 | 1 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 36175 |
| IRS990/GrossReceiptsAmt | 0 | 5344086 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 9 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 4 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 6638 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 21528 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 28166 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 14907 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 9246 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 24153 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 7852 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 7852 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 550540 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 611175 |
| IRS990/IRPDocumentCnt | 0 | 5 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 550289 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 2342127 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 2208138 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 2758427 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 36175 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 100000 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 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 | 2729429 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 3104010 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -844 |
| IRS990/NoncashContributionsAmt | 0 | 36175 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 189828 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 690374 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 880202 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 1271 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 6165 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 11344 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 18780 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrgDoesNotFollowFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 360000 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 372182 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 27068 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 173866 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 200934 |
| IRS990/OtherExpensesGrp/Desc | 0 | SCHOOL PROGRAMS AND ACT |
| IRS990/OtherExpensesGrp/Desc | 1 | CURRICULAR EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 2 | RECRUITMENT |
| IRS990/OtherExpensesGrp/Desc | 3 | ADMISSIONS & OUTREACH |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 1024 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 1416 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 1040 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 2968 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 74941 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 47272 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 16886 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 1647 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 77005 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 47272 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 16886 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 6031 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 480197 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 342054 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | UBI TAX REFUND |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 2782 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 2782 |
| IRS990/OtherRevenueTotalAmt | 0 | 2782 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 147878 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 1285751 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 1433629 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 11935 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 133658 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 145593 |
| IRS990/PdInCapSrplsLandBldgEqpFundGrp/BOYAmt | 0 | 0 |
| IRS990/PdInCapSrplsLandBldgEqpFundGrp/EOYAmt | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 53399 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 32814 |
| 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 | TESTING |
| IRS990/ProgramServiceRevenueGrp/Desc | 3 | PARENT ASSOCIATION FEE |
| IRS990/ProgramServiceRevenueGrp/Desc | 4 | FEE INCOME |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 4631971 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 35497 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 9491 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 3 | 5290 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 4 | 120 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 4631971 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 35497 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 9491 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 3 | 5290 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 4 | 120 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 914708 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 978423 |
| IRS990/PYInvestmentIncomeAmt | 0 | 9556 |
| IRS990/PYOtherExpensesAmt | 0 | 1566622 |
| IRS990/PYOtherRevenueAmt | 0 | 0 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 3941336 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 336121 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1984434 |
| IRS990/PYTotalExpensesAmt | 0 | 4529479 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 4865600 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 375425 |
| 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 | 4685151 |
| IRS990/RtnEarnEndowmentIncmOthFndsGrp/BOYAmt | 0 | 2729429 |
| IRS990/RtnEarnEndowmentIncmOthFndsGrp/EOYAmt | 0 | 3104010 |
| 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 | 34427 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 22761 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 57188 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/BookValueAmt | 0 | 2173711 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/DepreciationAmt | 0 | 527528 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/OtherCostOrOtherBasisAmt | 0 | 2701239 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 342054 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | DEFERRED RENT |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 2208138 |
| IRS990ScheduleD/TotalLiabilityAmt | 0 | 342054 |
| 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 | OUR COMPREHENSIVE RACIAL NONDISCRIMINATION POLICY APPEARS AT THE PROOF SCHOOL WEBSITE ON THE PAGE CONTAINING INFORMATION ON ADMISSIONS. IT IS ALSO 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 | 1061643 |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/GrantTypeTxt | 0 | FINANCIAL ASSISTANCE |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/RecipientCnt | 0 | 39 |
| 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 |
| IRS990ScheduleJ/CompBsdNetEarnsRltdOrgsInd | 0 | 0 |
| IRS990ScheduleJ/CompBsdOnRevRelatedOrgsInd | 0 | 0 |
| IRS990ScheduleJ/CompensationSurveyInd | 0 | X |
| IRS990ScheduleJ/EquityBasedCompArrngmInd | 0 | 0 |
| IRS990ScheduleJ/InitialContractExceptionInd | 0 | 0 |
| IRS990/ScheduleJRequiredInd | 0 | 1 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BaseCompensationFilingOrgAmt | 0 | 219773 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BaseCompensationFilingOrgAmt | 1 | 183316 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BaseCompensationFilingOrgAmt | 2 | 189051 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BonusFilingOrganizationAmount | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BonusFilingOrganizationAmount | 1 | 0 |
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Displayed year
2020 • Form 990Detailed filing. Detailed filing data is available for this year.