Liabilities / Assets
85th percentile
Higher debt load relative to assets than 85% of similar nonprofits.
EIN 04-3486659 • 501(c)3 • Boston, MA
Profile
German international school boston is a bilingual independent school serving students from preschool to grade 12. We offer a bilingual education with an internationally acclaimed german curriculum. As a global community, we strive to instill a love of learning and a sense of responsibility to prepare students for shaping our common future.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
85th percentile
Higher debt load relative to assets than 85% of similar nonprofits.
Liabilities / Revenue
84th percentile
Higher debt load relative to revenue than 84% of similar nonprofits.
Net Margin
56th percentile
Higher net margin than 56% of similar nonprofits.
Top Officer Pay
25th percentile
Higher top officer pay than 25% of similar nonprofits.
Top officer pay equals 1.2% of source-year revenue.
Asset Growth
35th percentile
Faster asset growth than 35% of similar nonprofits.
Revenue Growth
53rd percentile
Faster revenue growth than 53% of similar nonprofits.
Assets
Up$28,893,200
Up $383,615 (+1.3%) from 2024
Liabilities
Down$21,729,317
Down $735,957 (-3.3%) from 2024
Net Assets
Up$7,163,883
Up $1,119,572 (+19%) from 2024
Revenue
Up$13,637,941
Up $1,085,965 (+8.7%) from 2024
Expenses
Down$12,749,817
Down $258,113 (-2.0%) from 2024
Net Income
Up$888,124
Up $1,344,078 (+295%) from 2024
Most recent year
2025 • Form 990Detailed filing. Detailed filing data is available for this year.
German international school boston is a bilingual independent school serving students from preschool to grade 12. We offer a bilingual education with an internationally acclaimed german curriculum. As a global community, we strive to instill a love of learning and a sense of responsibility to prepare students for shaping our common future.
Education from pre-school through grade 12 providing the language and culture of germany
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Savings and Temporary Cash Investments | $6,023,263 | $6,887,290 | ▲ $864,027 |
| Land, Buildings, and Equipment, Net | $2,647,806 | $3,437,823 | ▲ $790,017 |
| Investments Other Securities | $1,549,505 | $1,548,469 | ▼ $1,036 |
| Cash and Non-Interest-Bearing Accounts | $773,018 | $331,718 | ▼ $441,300 |
| Prepaid Expenses and Deferred Charges | $49,668 | $137,925 | ▲ $88,257 |
| Accounts Receivable | $37,387 | $16,997 | ▼ $20,390 |
| Receivable From Disqualified Prsn | $0 | $0 | → $0 |
| Receivables From Officers Etc | $0 | $0 | → $0 |
| Investments Program Related | $0 | - | - |
| Intangible Assets | $0 | - | - |
| Loans From Officers Directors | $0 | $0 | → $0 |
| Total Assets | $28,509,585 | $28,893,200 | ▲ $383,615 |
| Other Assets Total | $17,428,938 | $16,532,978 | ▼ $895,960 |
| Liabilities | |||
| Other Liabilities | $18,138,407 | $17,700,830 | ▼ $437,577 |
| Deferred Revenue | $3,278,988 | $2,945,662 | ▼ $333,326 |
| Accounts Payable and Accrued Expenses | $568,411 | $772,086 | ▲ $203,675 |
| Mortgage Notes Payable Secured by Investment Property | $479,468 | $310,739 | ▼ $168,729 |
| Unsecured Notes Loans Payable | $0 | - | - |
| Escrow Account Liability | $0 | - | - |
| Tax Exempt Bond Liabilities | $0 | - | - |
| Total Liabilities | $22,465,274 | $21,729,317 | ▼ $735,957 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $6,025,204 | $7,146,021 | ▲ $1,120,817 |
| Net Assets With Donor Restrictions | $19,107 | $17,862 | ▼ $1,245 |
| Total Net Assets Fund Balance | $6,044,311 | $7,163,883 | ▲ $1,119,572 |
| Total Liabilities and Net Assets / Fund Balance | $28,509,585 | $28,893,200 | ▲ $383,615 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Leasehold Improvements | $1,832,462 | $5,383,961 | $7,216,423 |
| Other Land Buildings | $1,500,128 | $242,312 | $1,742,440 |
| Equipment | $105,233 | $614,175 | $719,408 |
| Other Assets Org | $57,750 | - | - |
| Other Securities | $1,548,469 | - | - |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Bettina Nancy Haarbusch | Head of Administration | FT | $158,940 | $10,092 | $169,032 |
| Paula Spencer | Director of Finance | FT | $137,460 | $7,176 | $144,636 |
| Anke Roost | Head of Early Education | FT | $119,469 | $16,852 | $136,321 |
| Funda Suzan | Acting Head of School | FT | $122,540 | $13,156 | $135,696 |
| Name | Title |
|---|---|
| Tilman Kispersky | Chair/president |
| Ulrike Bagehorn | Vice Chair/president and Secretary |
| Alexandra Gross | Trustee |
| Danielle Kellermann | Trustee |
| Gaurav Gaiha | Trustee (FROM 11/24) |
| Jan Tajo Fittkau | Trustee (FROM 11/24) |
| Elizabeth Mellyn | Trustee (thru 11/24) |
| Roy Goldschmitt | Trustee (thru 11/24) |
| Roos Karssemeijer | Treasurer (from 11/24) |
| Torin Koester | Treasurer (thru 11/24) |
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| Behnisch Architekten | Design And Construction | 125 Kingston Street Floor 2, Boston, MA 02111 | $217,703 |
| Timberline Construction Corp | Construction | 300 Pine Street, Canton, MA 02021 | $119,389 |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $8,088,168 |
| Other Expenses | $3,802,838 |
| Grants and Similar Amounts Paid | $846,311 |
| Total Fundraising Expense | $63,701 |
| Professional Fundraising Fees | $12,500 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $5,291,355 | $1,322,839 | - | $6,614,194 |
| Occupancy | $1,776,575 | $97,647 | - | $1,874,222 |
| Grants to Domestic Individuals | $846,311 | - | - | $846,311 |
| Depreciation Depletion | $571,414 | $30,074 | - | $601,488 |
| Payroll Taxes | $370,007 | $92,502 | - | $462,509 |
| Current Officers, Directors, Trustees, and Key Employees | $366,554 | $91,639 | - | $458,193 |
| Other Employee Benefits | $346,206 | $86,551 | - | $432,757 |
| Office Expenses | $184,460 | $68,742 | $40,334 | $293,536 |
| Pension Plan Contributions | $96,412 | $24,103 | - | $120,515 |
| Insurance | - | $101,084 | - | $101,084 |
| Fees for Services Accounting | - | $70,252 | - | $70,252 |
| Fees for Services Legal | - | $67,156 | - | $67,156 |
| Information Technology | $38,237 | $17,684 | $9,420 | $65,341 |
| Advertising | - | $53,786 | - | $53,786 |
| Interest | - | $15,461 | - | $15,461 |
| Fees for Services Professional Fundraising | - | - | $12,500 | $12,500 |
| Fees for Services Other | $0 | $11,702 | $740 | $12,442 |
| All Other Expenses | $3,068 | $5,152 | $0 | $8,220 |
| Fees for Service Investment Mgmnt Fees | - | $8,119 | - | $8,119 |
| Travel | $2,870 | $1,327 | $707 | $4,904 |
| Other Expenses | $220,178 | $2,729 | - | $2,729 |
| Total Functional Expenses | $10,505,465 | $2,180,651 | $63,701 | $12,749,817 |
| Line Item | Amount |
|---|---|
| Total Expenses per Form 990 | $12,749,817 |
| Expenses per Audited Statements | $11,903,506 |
| Total Expenses per Audited Statements | $11,903,506 |
| Expenses Not Reported on Financial Statements | $846,311 |
| Other Expense Adjustments | $846,311 |
| Expenses Not Reported on Form 990 | $0 |
| Region | Activity | Services | Offices | Employees | Spending |
|---|---|---|---|---|---|
| Europe (Including Iceland and Greenland) | Investments | - | 0 | 0 | $167,142 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $12,500 |
| Line Item | Beginning | End | Change |
|---|---|---|---|
| Loans from Officers, Directors, Trustees, and Key Employees | $0 | $0 | → $0 |
| Receivables from Disqualified Persons | $0 | $0 | → $0 |
| Receivables from Officers, Directors, Trustees, and Key Employees | $0 | $0 | → $0 |
| Liability | Amount |
|---|---|
| Federal Income Taxes | $17,700,830 |
| Lease Liabilities | $0 |
| Other Liabilities | - |
“All legal guardians whose children are enrolled at the german international school boston and provide school fees automatically become members of the corporation upon conclusion of the enrolment agreement, unless they expressly decide not to become members. In addition, other natural persons, including legal entites, who support the objectives of the organization, may become members of the organization.”
“The school's members (except those who are also teachers or employees of the school) elect the board of trustees. The board of trustees make decisions for the school.”
“The school's members have decision making powers as described in the by-laws.”
“The form 990 is reviewed in depth by the director of finance and board treasurer, after which it is provided to the full board before filing.”
“The conflict of interest policy at gisb is applicable to both its staff and board members, as outlined in the employee handbook. Furthermore, every year, all board members and senior leadership team members are required to sign a gisb conflict of interest disclosure statement. The board of trustees consistently conducts reviews and holds discussions pertaining to the conflict of interest policy. Additionally, there are supplementary policies, including the procurement policy and the vendor approval process, which fall under the purview of the head of administration and the director of finance, serving to bolster the implementation of the conflict of interest policy. To ensure transparency and accountability among its members, the board of trustees has established a process for reporting and addressing conflicts of interest.”
“Compensation increases for all employees, including officers and key employees, were discussed during board meetings. Previous year increases in compensation and current year evaluations were examined, and a reasonable increase in compensation for the current year was approved by the board members.”
“Compensation increases for all employees, including officers and key employees, were discussed during board meetings. Previous year increases in compensation and current year evaluations were examined, and a reasonable increase in compensation for the current year was approved by the board members”
“The organization's governing documents are made available to the public upon request. The bylaws are also available on the school's website.”
“FOREIGN CURRENCY EXCHANGE - 56675; Total - 56675;”
“Foreign Currency Transaction Gain - 56675 Financial Aid - -846311”
“FINANCIAL AID - 846311”
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 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 568411 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 772086 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 37387 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 16997 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | EDUCATION FROM PRE-SCHOOL THROUGH GRADE 12 PROVIDING THE LANGUAGE AND CULTURE OF GERMANY |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 53786 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 53786 |
| IRS990/AllOtherContributionsAmt | 0 | 104255 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 5152 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 3068 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 8220 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | PAULA SPENCER |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6177832600 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 57 HOLTON STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Boston |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02134 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 773018 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 331718 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 91639 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 366554 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 458193 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 217703 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 119389 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 125 Kingston Street Floor 2 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 300 Pine Street |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | Boston |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | Canton |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 02111 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 02021 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | Behnisch Architekten |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | Timberline Construction Corp |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | DESIGN AND CONSTRUCTION |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | CONSTRUCTION |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 3080066 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 846311 |
| IRS990/CYInvestmentIncomeAmt | 0 | 237390 |
| IRS990/CYOtherExpensesAmt | 0 | 3802838 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 10320485 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 888124 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 8088168 |
| IRS990/CYTotalExpensesAmt | 0 | 12749817 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 63701 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 12500 |
| IRS990/CYTotalRevenueAmt | 0 | 13637941 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | true |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 3278988 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 2945662 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 30074 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 571414 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 601488 |
| IRS990/Desc | 0 | THE SCHOOL PROVIDES A GERMAN EDUCATION FOR STUDENTS IN GRADES PRESCHOOL THROUGH GRADE 12. IN FISCAL 2025 THE SCHOOL SERVED 295 STUDENTS. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 19107 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 17862 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | true |
| IRS990/EmployeeCnt | 0 | 121 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/EscrowAccountInd | 0 | false |
| IRS990/EscrowAccountLiabilityGrp/BOYAmt | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 10505465 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 70252 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 70252 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 67156 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 67156 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 740 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 11702 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 12442 |
| IRS990/FeesForServicesProfFundraising/FundraisingAmt | 0 | 12500 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 12500 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 8119 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 8119 |
| IRS990/ForeignActivitiesInd | 0 | true |
| IRS990/ForeignCountryCd | 0 | GM |
| IRS990/ForeignFinancialAccountInd | 0 | true |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 12 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 13 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 4.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 8.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 4.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 4.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 8.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 4.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 4.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 4.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 4.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 4.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 40.0 |
| 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/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 6 | 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 10092 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 13156 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 7176 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 16852 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Roos Karssemeijer |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | TILMAN KISPERSKY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | TORIN KOESTER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | ULRIKE BAGEHORN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | ALEXANDRA GROSS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | DANIELLE KELLERMANN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | ELIZABETH MELLYN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Gaurav Gaiha |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Jan Tajo Fittkau |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | ROY GOLDSCHMITT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | BETTINA NANCY HAARBUSCH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | FUNDA SUZAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | PAULA SPENCER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | ANKE ROOST |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 158940 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 122540 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 137460 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 119469 |
| 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 | TREASURER (FROM 11/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | CHAIR/PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER (THRU 11/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | VICE CHAIR/PRESIDENT AND SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | TRUSTEE (THRU 11/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Trustee (FROM 11/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Trustee (FROM 11/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | TRUSTEE (THRU 11/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | HEAD OF ADMINISTRATION |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Acting Head of School |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | DIRECTOR OF FINANCE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | HEAD OF EARLY EDUCATION |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1999 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 202 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 7 |
| IRS990/GovernmentGrantsAmt | 0 | 2975811 |
| IRS990/GrantAmt | 0 | 846311 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 846311 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 846311 |
| IRS990/GrantsToIndividualsInd | 0 | true |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | true |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 584661 |
| IRS990/GrossReceiptsAmt | 0 | 14222400 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | false |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 2 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 4 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartVInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 9420 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 17684 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 38237 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 65341 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 101084 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 101084 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 0 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 15461 |
| IRS990/InterestGrp/TotalAmt | 0 | 15461 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 237188 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 237188 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 1549505 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 1548469 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 64 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 6240448 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 2647806 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 3437823 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 9678271 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 584459 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 0 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | true |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MiscellaneousRevenueGrp/ExclusionAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/MissionDesc | 0 | GERMAN INTERNATIONAL SCHOOL BOSTON IS A BILINGUAL INDEPENDENT SCHOOL SERVING STUDENTS FROM PRESCHOOL TO GRADE 12. WE OFFER A BILINGUAL EDUCATION WITH AN INTERNATIONALLY ACCLAIMED GERMAN CURRICULUM. AS A GLOBAL COMMUNITY, WE STRIVE TO INSTILL A LOVE OF LEARNING AND A SENSE OF RESPONSIBILITY TO PREPARE STUDENTS FOR SHAPING OUR COMMON FUTURE. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 479468 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 310739 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 6044311 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 7163883 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 202 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 202 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 174773 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 6025204 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 7146021 |
| IRS990/NoncashContributionsAmt | 0 | 5072 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 97647 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 1776575 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 1874222 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 40334 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 68742 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 184460 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 293536 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OnBehalfOfIssuerInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 17428938 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 16532978 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 56675 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 86551 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 346206 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 432757 |
| IRS990/OtherExpensesGrp/Desc | 0 | CLASSROOM SUPPLIES AND MATERIALS |
| IRS990/OtherExpensesGrp/Desc | 1 | MAINTENANCE AND REPAIRS |
| IRS990/OtherExpensesGrp/Desc | 2 | BAD DEBTS |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 12102 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 2729 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 391818 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 220178 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 391818 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 232280 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 2729 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 18138407 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 17700830 |
| IRS990/OtherRevenueTotalAmt | 0 | 0 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 1322839 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 5291355 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 6614194 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 92502 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 370007 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 462509 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 24103 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 96412 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 120515 |
| IRS990/PoliciesReferenceChaptersInd | 0 | false |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 49668 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 137925 |
| IRS990/PrincipalOfcrBusinessName/BusinessNameLine1Txt | 0 | TILMAN KISPERSKY |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 611600 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 611710 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 611170 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 3 | 611170 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | TUITION & FEES |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | CO-CURRICULAR PROGRAMS |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | OTHER FEES |
| IRS990/ProgramServiceRevenueGrp/Desc | 3 | LATE FEES |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 8752398 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 1556132 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 6641 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 3 | 5314 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 8752398 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 1556132 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 6641 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 3 | 5314 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 1899254 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 936429 |
| IRS990/PYInvestmentIncomeAmt | 0 | 382181 |
| IRS990/PYOtherExpensesAmt | 0 | 4011225 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 10270541 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -455954 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 8011376 |
| IRS990/PYTotalExpensesAmt | 0 | 13007930 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 48900 |
| IRS990/PYTotalRevenueAmt | 0 | 12551976 |
| IRS990/QuidProQuoContributionsInd | 0 | false |
| IRS990/RcvblFromDisqualifiedPrsnGrp/BOYAmt | 0 | 0 |
| IRS990/RcvblFromDisqualifiedPrsnGrp/EOYAmt | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | false |
| IRS990/ReceivablesFromOfficersEtcGrp/BOYAmt | 0 | 0 |
| IRS990/ReceivablesFromOfficersEtcGrp/EOYAmt | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 888124 |
| IRS990/RegularMonitoringEnfrcInd | 0 | true |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/RentalIncomeOrLossGrp/PersonalAmt | 0 | 0 |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | true |
| IRS990/ReportLandBuildingEquipmentInd | 0 | true |
| IRS990/ReportOtherAssetsInd | 0 | true |
| IRS990/ReportOtherLiabilitiesInd | 0 | true |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 10320485 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 6023263 |
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