Nonprofit · EIN 51-0102104
WILMINGTON MONTESSORI SCHOOL
Tax-exempt · WILMINGTON, DE 19810
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| August 31, 2025 | 990 | $4,333,738 | $3,944,427 | $389,311 | $10,777,877 | $1,457,635 | $9,320,242 |
| August 31, 2024 | 990 | $4,086,367 | $3,917,345 | $169,022 | $10,256,873 | $1,423,880 | $8,832,993 |
| August 31, 2023 | 990 | $4,300,822 | $3,926,707 | $374,115 | $9,635,195 | $1,289,892 | $8,345,303 |
Financial details: 990 for the year ended August 31, 2025
Revenue
- Contributions, gifts and grants
- $143,032
- Program service revenue
- $3,846,184
- Investment income
- $333,637
- Net income from fundraising events
- $10,885
- Other revenue
- $10,885
Expenses
- Grants and similar amounts paid
- $408,622
- Compensation of officers, directors and key employees
- $119,249
- Other salaries and wages
- $2,357,511
- Salaries, compensation and benefits (total)
- $2,747,248
- Professional fundraising fees
- $0
- Legal fees
- $1,467
- Accounting fees
- $18,500
- Occupancy
- $74,323
- Depreciation
- $192,086
- Program services (functional)
- $3,170,869
- Management and general (functional)
- $724,915
- Fundraising (functional)
- $48,643
Balance sheet and other
- Total assets, start of year
- $10,256,873
- Total assets, end of year
- $10,777,877
- Total liabilities, end of year
- $1,457,635
- Net assets, end of year
- $9,320,242
- Land, buildings and equipment
- $2,436,025
- Publicly traded securities
- $4,033,987
- Net assets without donor restrictions
- $8,824,207
- Net assets with donor restrictions
- $496,035
- Gross receipts
- $4,361,453
- Employees
- 74
- Volunteers
- 330
- Year formed
- 1963
- State of legal domicile
- DE
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 August 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| SARAH WILLIAMS | HEAD OF SCHOOL Officer | 40 | $102,088 | $1,118 |
| PAUL SAKAGUCHI | CHAIR Trustee or director, Officer | 1 | $0 | $0 |
| JOE ABELE | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| SRIRAM NADATHUR | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| JAMES WAKE | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| CAROLINE LINTNER | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| SUSIE VENTRESCA | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| GARY FINGER | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| DONNA BISSEY | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| TED KIRKPATRICK | VICE CHAIR Trustee or director, Officer | 1 | $0 | $0 |
990 for the year ended August 31, 2024: 13 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| LISA LALAMA | FORMER HEAD OF SCHOOL Officer | 40 | $116,132 | $3,524 |
| SARAH WILLIAMS | NEW HEAD OF SCHOOL Officer | 40 | $97,440 | $0 |
| GARY FINGER | FORMER BUSINESS MANAGER Officer | 40 | $47,702 | $1,744 |
| LESLIE BASTIANELLI | NEW BUSINESS MANAGER Officer | 40 | $34,158 | $7,552 |
| PAUL SAKAGUCHI | CHAIR Trustee or director, Officer | 1 | $0 | $0 |
| JOE ABELE | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| SRIRAM NADATHUR | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| LISA HASTINGS-SHEPPARD | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| JAMES WAKE | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| CAROLINE LINTNER | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| SUSIE VENTRESCA | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| DONNA BISSEY | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| TED KIRKPATRICK | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
990 for the year ended August 31, 2023: 11 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| LISA LALAMA | HEAD OF SCHOOL Officer | 40 | $108,584 | $9,217 |
| GARY FINGER | BUSINESS MANAGER Officer | 40 | $44,006 | $11,577 |
| PAUL SAKAGUCHI | CHAIR Trustee or director, Officer | 1 | $0 | $0 |
| JOE ABELE | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| ISRAEL FLOYD | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| LISA HASTING-SHEPPARD | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| JAYME BANKS | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| MAYURA SIMON | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| RICHARD GULINO | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| DONNA BISSEY | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
| TED KIRKPATRICK | BOARD MEMBER Trustee or director | 1 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- 1400 HARVEY RD, WILMINGTON, DE 19810-4210
- Principal officer (990 for 2024)
- SARAH WILLIAMS, 1400 HARVEY ROAD, WILMINGTON, DE 19810
- Signed the 990
- SARAH WILLIAMS, HEAD OF SCHOOL
- Phone
- (302) 475-0555
- Website
- WWW.WMSDE.ORG
- Return prepared by
- GUNNIP & COMPANY LLP
Mission
THE SCHOOL IS A COLLABORATIVE LEARNING COMMUNITY ROOTED IN MONTESSORI PRINCIPLES, INSPIRING THE JOYFUL DISCOVERY OF SELF AND A PASSION FOR LEARNING AND INDEPENDENT THINKING. WE EMPOWER CHILDREN TO BE KNOWLEDGEABLE AND RESPONSIBLE CONTRIBUTORS TO THE GLOBAL COMMUNITY.
Program accomplishments
- PRESCHOOL, ELEMENTARY, AND MIDDLE SCHOOL EDUCATION PROGRAMS USING MONTESSORI METHODS OF EDUCATION FOR APPROXIMATELY 162 STUDENTSExpenses $2,944,648 · grants $408,622 · revenue $3,399,005
- SUMMER DAY CAMP PROGRAM FOR APPROXIMATELY 200 CHILDREN TO CONTINUE AND REINFORCE OTHER LEARNING EXPERIENCES BEYOND THE TRADITIONAL SCHOOL YEAR. MAIN FOCUS IS ON NATURE, SCIENCE, ART, MUSIC AND OTHER SPECIALTIES.Expenses $226,221 · revenue $447,179
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 August, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | August 31, 2026 | January 15, 2027 | Not due yet |
| 2024 | August 31, 2025 | January 15, 2026 | 990 on file |
| 2023 | August 31, 2024 | January 15, 2025 | 990 on file |
IRS record
- EIN
- 51-0102104
- 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
- 1965
- Accounting year ends
- August
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Education (B21Z)
- Assets (IRS master file)
- $10,777,877
- Income (IRS master file)
- $4,361,453
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | August 2025 | $4,333,738 | $3,944,427 | $10,777,877 | XML |
| 990 | August 2024 | $4,086,367 | $3,917,345 | $10,256,873 | XML |
| 990 | August 2023 | $4,300,822 | $3,926,707 | $9,635,195 | XML |
| 990 | August 2022 | $5,146,892 | $3,703,135 | $9,356,821 | IRS |
| 990 | August 2021 | – | – | – | IRS |
| 990 | August 2020 | – | – | – | IRS |
| 990 | August 2019 | – | – | – | IRS |
| 990 | August 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 51-0102104).
Questions about WILMINGTON MONTESSORI SCHOOL
- What is the EIN of WILMINGTON MONTESSORI SCHOOL?
- The employer identification number (EIN) of WILMINGTON MONTESSORI SCHOOL is 51-0102104.
- Is WILMINGTON MONTESSORI SCHOOL tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1965.
- Are donations to WILMINGTON MONTESSORI SCHOOL tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does WILMINGTON MONTESSORI SCHOOL 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 WILMINGTON MONTESSORI SCHOOL due?
- The return for tax year 2025 (the year ending August 31, 2026) is due January 15, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did WILMINGTON MONTESSORI SCHOOL last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended August 2025.
- Who is the principal officer of WILMINGTON MONTESSORI SCHOOL?
- The 990 for the year ended August 31, 2025 names SARAH WILLIAMS.
- Who are the officers and directors of WILMINGTON MONTESSORI SCHOOL?
- The 990 for the year ended August 31, 2025 lists 10 people; 1 received compensation from the organization, the highest $102,088 (SARAH WILLIAMS, HEAD OF SCHOOL).
- How much revenue does WILMINGTON MONTESSORI SCHOOL have?
- On its 990 for the year ended August 31, 2025 it reported revenue of $4,333,738, expenses of $3,944,427 and total assets of $10,777,877 at year end.
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