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
80th percentile
Higher debt load relative to revenue than 80% of similar nonprofits.
Net Margin
61st percentile
Higher net margin than 61% of similar nonprofits.
Top Officer Pay
Score unavailable
This filing does not contain officer compensation rows.
Asset Growth
80th percentile
Faster asset growth than 80% of similar nonprofits.
Revenue Growth
77th percentile
Faster revenue growth than 77% of similar nonprofits.
Assets
Up$6,992,457
Up $1,049,071 (+18%) from 2018
Net Assets
Up$2,729,429
Up $206,932 (+8.2%) from 2018
Liabilities
Up$4,263,028
Up $842,139 (+25%) from 2018
Revenue
Up$4,865,600
Up $802,305 (+20%) from 2018
Expenses
Up$4,529,479
Up $927,414 (+26%) from 2018
Net Income
Down$336,121
Down $125,109 (-27%) from 2018
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 | |||
| Land, Buildings, and Equipment, Net | $2,415,952 | $2,342,127 | ▼ $73,825 |
| Accounts Receivable | $1,655,220 | $2,191,878 | ▲ $536,658 |
| Cash and Non-Interest-Bearing Accounts | $900,550 | $1,494,513 | ▲ $593,963 |
| Investments in Publicly Traded Securities | $356,873 | $550,540 | ▲ $193,667 |
| Loans From Officers Directors | $200,000 | $100,000 | ▼ $100,000 |
| Prepaid Expenses and Deferred Charges | $31,271 | $53,399 | ▲ $22,128 |
| Total Assets | $5,943,386 | $6,992,457 | ▲ $1,049,071 |
| Other Assets Total | $583,520 | $360,000 | ▼ $223,520 |
| Liabilities | |||
| Deferred Revenue | $2,816,638 | $3,641,135 | ▲ $824,497 |
| Other Liabilities | $336,026 | $480,197 | ▲ $144,171 |
| Accounts Payable and Accrued Expenses | $68,225 | $41,696 | ▼ $26,529 |
| Total Liabilities | $3,420,889 | $4,263,028 | ▲ $842,139 |
| Net Assets / Fund Balance | |||
| Unrestricted Net Assets | $2,522,497 | $2,729,429 | ▲ $206,932 |
| Total Net Assets Fund Balance | $2,522,497 | $2,729,429 | ▲ $206,932 |
| Total Liabilities and Net Assets / Fund Balance | $5,943,386 | $6,992,457 | ▲ $1,049,071 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Leasehold Improvements | $2,326,004 | $258,445 | $2,584,449 |
| Equipment | $16,123 | $8,062 | $24,185 |
| Other Assets Org | $360,000 | - | - |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Samuel K Vandervelde | Head of School | FT | $179,957 | $29,895 | $209,852 |
| Zachary Sifuentes | Dean of Humanities | FT | $174,752 | $24,400 | $199,152 |
| Kathy Lin | Director of Admissions | FT | $161,794 | $5,478 | $167,272 |
| 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 | 8 | $182,525 | Fair Market Value |
| Total Noncash Contributions | 8 | $182,525 | - |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $1,984,434 |
| Other Expenses | $1,566,622 |
| Grants and Similar Amounts Paid | $978,423 |
| Total Fundraising Expense | $4,030 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $1,019,838 | $92,137 | - | $1,111,975 |
| Occupancy | $791,404 | $191,772 | - | $983,176 |
| Grants to Domestic Individuals | $978,423 | - | - | $978,423 |
| Current Officers, Directors, Trustees, and Key Employees | $576,276 | - | - | $576,276 |
| Depreciation Depletion | $207,875 | $58,631 | - | $266,506 |
| Other Employee Benefits | $119,849 | $28,452 | - | $148,301 |
| Payroll Taxes | $116,322 | $7,724 | - | $124,046 |
| Information Technology | $11,291 | $26,710 | - | $38,001 |
| Insurance | $12,380 | $20,958 | - | $33,338 |
| Pension Plan Contributions | $22,311 | $1,525 | - | $23,836 |
| Fees for Services Accounting | $1,507 | $21,105 | - | $22,612 |
| Office Expenses | $10,909 | $7,707 | - | $18,616 |
| Other Expenses | $21,971 | $6,158 | $2,822 | $2,822 |
| Conferences and Meetings | $2,367 | $62 | - | $2,429 |
| Fees for Services Legal | - | $1,572 | - | $1,572 |
| Advertising | - | - | $830 | $830 |
| Total Functional Expenses | $4,060,330 | $465,119 | $4,030 | $4,529,479 |
| Line Item | Amount |
|---|---|
| Total Expenses per Form 990 | $4,529,479 |
| Expenses per Audited Statements | $3,551,056 |
| Total Expenses per Audited Statements | $3,551,056 |
| Expenses Not Reported on Financial Statements | $978,423 |
| Other Expense Adjustments | $978,423 |
| Expenses Not Reported on Form 990 | $0 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Line Item | Beginning | End | Change |
|---|---|---|---|
| Loans from Officers, Directors, Trustees, and Key Employees | $200,000 | $100,000 | ▼ $100,000 |
| Liability | Amount |
|---|---|
| Deferred Rent | $480,197 |
“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.”
“The school is a tax-exempt organization under internal revenue code section 501(c)(3) and the california tax code. The school follows the guidance of the financial accounting standards board (fasb) accounting standards codification (asc) topic 740 for accounting for uncertainty in income taxes. Management evaluated the school's tax positions and concluded that the school had maintained its tax-exempt status and had taken no uncertain tax positions that required adjustment to the financial statements. Therefore, no provision or liability for income taxes has been included in the financial statements.”
“Financial aid awards netted against revenue -978,423.”
“Financial aid awards netted against revenue 978,423.”
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 | 68225 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 41696 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 1655220 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 2191878 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | OFFERING A LIBERAL ARTS EDUCATION FOR KIDS WHO LOVE MATH, REASONING AND COMMUNICATION. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 830 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 830 |
| IRS990/AllOtherContributionsAmt | 0 | 914708 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 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/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 900550 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 1494513 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 576276 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 576276 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 62 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 2367 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 2429 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 914708 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 978423 |
| IRS990/CYInvestmentIncomeAmt | 0 | 9556 |
| IRS990/CYOtherExpensesAmt | 0 | 1566622 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 3941336 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 336121 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1984434 |
| IRS990/CYTotalExpensesAmt | 0 | 4529479 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 4030 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 4865600 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 2816638 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 3641135 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 58631 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 207875 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 266506 |
| IRS990/Desc | 0 | PROOF SCHOOL DELIVERED A COMPREHENSIVE MIDDLE OR HIGH SCHOOL CURRICULUM TO A TOTAL OF 97 STUDENTS DURING THE 2018-19 ACADEMIC YEAR. SCHOOL WAS IN SESSION FOR 172 DAYS; THE SCHOOL ALSO HELD TWO SYMPOSIUMS, TWO INFO SESSIONS, TWO MATH FESTIVALS, AND GRADUATED 10 STUDENTS. GOALS FOR THE SCHOOL ARE TO CONTINUE TO PROVIDE A WORLD CLASS EDUCATION TO 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/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 21 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 4060330 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 21105 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 1507 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 22612 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 1572 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 1572 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 3.00 |
| 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 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 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/KeyEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 29895 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 24400 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 5478 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | PAUL ZEITZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | DENNIS LEARY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | ALON AMIT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | DIVIYA MAGARO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | JAMES SOTIROS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | PERRY TAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | RAVI VAKIL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | ANA BRUBAKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | LISA PARK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | SAMUEL K VANDERVELDE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | ZACHARY SIFUENTES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | KATHY LIN |
| 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 | 179957 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 174752 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 161794 |
| 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/TitleTxt | 0 | BOARD CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | BOARD MEMBER |
| 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 | HEAD OF SCHOOL |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DEAN OF HUMANITIES |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR OF ADMISSIONS |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 2013 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 10 |
| IRS990/GrantAmt | 0 | 978423 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 978423 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 978423 |
| IRS990/GrantsToIndividualsInd | 0 | 1 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 182525 |
| IRS990/GrossReceiptsAmt | 0 | 5048125 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 8 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 26710 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 11291 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 38001 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 20958 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 12380 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 33338 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 9556 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 9556 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 356873 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 550540 |
| IRS990/IRPDocumentCnt | 0 | 6 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 266507 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 2415952 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 2342127 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 2608634 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 182525 |
| IRS990/LoanOutstandingInd | 0 | 1 |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 200000 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 100000 |
| 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 | 2522497 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 2729429 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 1586 |
| IRS990/NoncashContributionsAmt | 0 | 182525 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 191772 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 791404 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 983176 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 7707 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 10909 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 18616 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 583520 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 360000 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 28452 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 119849 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 148301 |
| 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 | 378 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 2822 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 149 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 457 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 6158 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 95998 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 71609 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 21971 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 96525 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 72066 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 28129 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 2822 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 336026 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 480197 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 92137 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 1019838 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 1111975 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 7724 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 116322 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 124046 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 1525 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 22311 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 23836 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 31271 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 53399 |
| IRS990/PrincipalOfficerNm | 0 | SAMUEL VANDERVELDE |
| IRS990/PriorPeriodAdjustmentsAmt | 0 | -130775 |
| 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 | FIELD TRIP FEES |
| IRS990/ProgramServiceRevenueGrp/Desc | 3 | MANDELBROT COMPETITION |
| IRS990/ProgramServiceRevenueGrp/Desc | 4 | PARENT ASSOCIATION FEE |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 3862400 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 44444 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 20100 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 3 | 9309 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 4 | 4310 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 3862400 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 44444 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 20100 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 3 | 9309 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 4 | 4310 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 1054733 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 623431 |
| IRS990/PYInvestmentIncomeAmt | 0 | 4011 |
| IRS990/PYOtherExpensesAmt | 0 | 1425842 |
| IRS990/PYOtherRevenueAmt | 0 | 0 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 3004551 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 461230 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1552792 |
| IRS990/PYTotalExpensesAmt | 0 | 3602065 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 4063295 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 336121 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 1 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 1 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 3941336 |
| 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 | 16123 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 8062 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 24185 |
| IRS990ScheduleD/ExpensesNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 978423 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 3551056 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/LeaseholdImprovementsGrp/BookValueAmt | 0 | 2326004 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/DepreciationAmt | 0 | 258445 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/OtherCostOrOtherBasisAmt | 0 | 2584449 |
| IRS990ScheduleD/NetUnrealizedGainsInvstAmt | 0 | 1586 |
| IRS990ScheduleD/OtherAssetsOrgGrp/BookValueAmt | 0 | 360000 |
| IRS990ScheduleD/OtherAssetsOrgGrp/Desc | 0 | SECURITY DEPOSITS |
| IRS990ScheduleD/OtherExpensesNotIncludedAmt | 0 | 978423 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 480197 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | DEFERRED RENT |
| IRS990ScheduleD/OtherRevenueAmt | 0 | -978423 |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | -976837 |
| IRS990ScheduleD/RevenueNotReportedFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 4865600 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | THE SCHOOL IS A TAX-EXEMPT ORGANIZATION UNDER INTERNAL REVENUE CODE SECTION 501(C)(3) AND THE CALIFORNIA TAX CODE. THE SCHOOL FOLLOWS THE GUIDANCE OF THE FINANCIAL ACCOUNTING STANDARDS BOARD (FASB) ACCOUNTING STANDARDS CODIFICATION (ASC) TOPIC 740 FOR ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES. MANAGEMENT EVALUATED THE SCHOOL'S TAX POSITIONS AND CONCLUDED THAT THE SCHOOL HAD MAINTAINED ITS TAX-EXEMPT STATUS AND HAD TAKEN NO UNCERTAIN TAX POSITIONS THAT REQUIRED ADJUSTMENT TO THE FINANCIAL STATEMENTS. THEREFORE, NO PROVISION OR LIABILITY FOR INCOME TAXES HAS BEEN INCLUDED IN THE FINANCIAL STATEMENTS. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 1 | FINANCIAL AID AWARDS NETTED AGAINST REVENUE -978,423. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 2 | FINANCIAL AID AWARDS NETTED AGAINST REVENUE 978,423. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | PART X, LINE 2: |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | PART XI, LINE 2D - OTHER ADJUSTMENTS: |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | PART XII, LINE 4B - OTHER ADJUSTMENTS: |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 2342127 |
| IRS990ScheduleD/TotalBookValueOtherAssetsAmt | 0 | 360000 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 4529479 |
| IRS990ScheduleD/TotalLiabilityAmt | 0 | 480197 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 4865600 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 3888763 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 3551056 |
| 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 | 978423 |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/GrantTypeTxt | 0 | FINANCIAL ASSISTANCE |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/RecipientCnt | 0 | 53 |
| 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 |
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Displayed year
2019 • Form 990Detailed filing. Detailed filing data is available for this year.