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Nonprofit · EIN 81-5374114

SLATE SCHOOL INC

Tax-exempt · NORTH HAVEN, CT 06473

Financials

$11.6M$1.4M2022$11M$1.8M2023$4.4M$2.7M2024
Revenue Expenses · by fiscal year end
Financials of SLATE SCHOOL INC by year, from its e-filed returns
Year endedFormRevenueExpensesNet incomeTotal assetsLiabilitiesNet assets
June 30, 2025990$4,362,084$2,705,164$1,656,920$38,947,771$97,225$38,850,546
June 30, 2024990$10,953,370$1,814,555$9,138,815$38,225,402$1,031,776$37,193,626
June 30, 2023990$11,643,767$1,437,729$10,206,038$29,514,578$1,459,767$28,054,811
Financial details: 990 for the year ended June 30, 2025

Revenue

Contributions, gifts and grants
$3,349,396
Program service revenue
$1,008,245
Investment income
$0
Net income from fundraising events
$362
Other revenue
$4,443

Expenses

Grants and similar amounts paid
$0
Compensation of officers, directors and key employees
$150,000
Other salaries and wages
$901,741
Salaries, compensation and benefits (total)
$1,154,604
Professional fundraising fees
$0
Legal fees
$1,644
Accounting fees
$8,975
Travel
$1,034
Depreciation
$854,919
Program services (functional)
$2,602,522
Management and general (functional)
$102,642

Balance sheet and other

Total assets, start of year
$38,225,402
Total assets, end of year
$38,947,771
Total liabilities, end of year
$97,225
Net assets, end of year
$38,850,546
Land, buildings and equipment
$38,807,113
Net assets without donor restrictions
$38,850,546
Gross receipts
$4,362,084
Employees
16
Volunteers
10
Year formed
2017
State of legal domicile
CT

From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.

Officers, directors and key employees

As listed on the 990 for the year ended June 30, 2025, highest compensation first.

NameTitleHours / weekCompensationOther / benefits
JULIE MOUNTCASTLEHEAD OF SCHOOL
Trustee or director
60$150,000$6,000
ALEXANDER CLARKTREASURER/SECRETARY
Trustee or director, Officer
1$0$0
JENNIFER STAPLE-CLARKPRESIDENT
Trustee or director, Officer
50$0$0
PAUL ELLINGSTADDIRECTOR
Trustee or director
1$0$0
WENDY OSTROFFDIRECTOR
Trustee or director
1$0$0
990 for the year ended June 30, 2024: 5 people
NameTitleHours / weekCompensationOther / benefits
JULIE MOUNTCASTLEHEAD OF SCHOOL
Trustee or director
60$151,032$5,077
ALEXANDER CLARKTREASURER/SECRETARY
Trustee or director, Officer
1$0$0
JENNIFER STAPLE-CLARKPRESIDENT
Trustee or director, Officer
50$0$0
PAUL ELLINGSTADDIRECTOR
Trustee or director
1$0$0
WENDY OSTROFFDIRECTOR
Trustee or director
1$0$0
990 for the year ended June 30, 2023: 5 people
NameTitleHours / weekCompensation
JULIE MOUNTCASTLEHEAD OF SCHOOL
Trustee or director
60$156,864
ALEXANDER CLARKTREASURER/SECRETARY
Trustee or director, Officer
1$0
JENNIFER STAPLE CLARKPRESIDENT
Trustee or director, Officer
50$0
PAUL ELLINGSTADDIRECTOR
Trustee or director
1$0
WENDY OSTROFFDIRECTOR
Trustee or director
1$0

Address and contacts

Address (IRS master file)
124 MANSFIELD RD, NORTH HAVEN, CT 06473-1277
In care of
% JENNIFER STAPLE CLARK
Principal officer (990 for 2024)
JENNIFER STAPLE CLARK, 124 MANSFIELD ROAD, NORTH HAVEN, CT 06473
Signed the 990
JENNIFER STAPLE CLARK, DIRECTOR
Phone
(203) 404-4900
Return prepared by
BAILEY SCARANO LLC

Mission

THE SLATE SCHOOL, INC. IS DESIGNED TO CULTIVATE STUDENT CREATIVITY, FOSTER INGENUITY, AND INSPIRE A DEEP PASSION FOR LIFELONG LEARNING AND DISCOVERY. THE ORGANIZATIONS MISSION AND PRIORITY IS THAT EACH CHILD'S INNATE AND NATURAL LOVE FOR LEARNING BE NURTURED AND ENABLED TO GROW AND FLOURISH.

990 for the year ended June 30, 2025

Program accomplishments

  • K-12 SCHOOL
    Expenses $2,602,522
  • UPPER SCHOOL DEVELOPMENT AND CONSTRUCTION. DURING THE FISCAL YEAR $3,940,936 OF COSTS RELATING TO SLATE UPPER SCHOOL WERE EXPENDED FOR THE DEVELOPMENT AND CONSTRUCTION. ALONG WITH $19,117,339 OF PREVIOUSLY EXPENDED CONSTRUCTION IN PROCESS COSTS, A TOTAL OF $23,058,275 WAS PLACED IN SERVICE DURING THE FISCAL YEAR, AS SCHOOL OPERATIONS COMMENCED IN FALL 2024.

What it must file and when

IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in June, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025June 30, 2026November 16, 2026Not due yet
2024June 30, 2025November 17, 2025990 on file
2023June 30, 2024November 15, 2024990 on file

IRS record

EIN
81-5374114
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
School
Donations deductible (Pub 78)
Public charity, 50% deduction limit
Exempt since
2017
Accounting year ends
June
Files
Form 990 or 990-EZ
Category (NTEE)
Education (B20)
Assets (IRS master file)
$38,947,771
Income (IRS master file)
$4,362,084

Filing history

FormYear endedRevenueExpensesAssetsReturn
990June 2025$4,362,084$2,705,164$38,947,771IRS
990June 2024$10,953,370$1,814,555$38,225,402IRS
990June 2023$11,643,767$1,437,729$29,514,578XML
990June 2022$4,188,602$1,366,652$18,120,974IRS
990June 2021–––IRS
990June 2020–––IRS
990June 2018–––IRS

990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 81-5374114).

Questions about SLATE SCHOOL INC

What is the EIN of SLATE SCHOOL INC?
The employer identification number (EIN) of SLATE SCHOOL INC is 81-5374114.
Is SLATE SCHOOL INC tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2017.
Are donations to SLATE SCHOOL INC tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does SLATE SCHOOL INC file?
Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
When is the next return of SLATE SCHOOL INC due?
The return for tax year 2025 (the year ending June 30, 2026) is due November 16, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
When did SLATE SCHOOL INC last file with the IRS?
The latest return in the IRS public files is the 990 for the year ended June 2025.
Who is the principal officer of SLATE SCHOOL INC?
The 990 for the year ended June 30, 2025 names JENNIFER STAPLE CLARK.
Who are the officers and directors of SLATE SCHOOL INC?
The 990 for the year ended June 30, 2025 lists 5 people; 1 received compensation from the organization, the highest $150,000 (JULIE MOUNTCASTLE, HEAD OF SCHOOL).
How much revenue does SLATE SCHOOL INC have?
On its 990 for the year ended June 30, 2025 it reported revenue of $4,362,084, expenses of $2,705,164 and total assets of $38,947,771 at year end.

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