Nonprofit · EIN 13-1992185
WEST SIDE MONTESSORI SCHOOL
Tax-exempt · NEW YORK, NY 10025
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| June 30, 2025 | 990 | $15,094,740 | $15,254,442 | -$159,702 | $51,804,798 | $22,743,677 | $29,061,121 |
| June 30, 2024 | 990 | $12,664,529 | $13,391,460 | -$726,931 | $38,306,732 | $9,587,257 | $28,719,475 |
| June 30, 2023 | 990 | $11,284,083 | $11,752,766 | -$468,683 | $37,420,941 | $8,896,569 | $28,524,372 |
Financial details: 990 for the year ended June 30, 2025
Revenue
- Contributions, gifts and grants
- $2,730,263
- Program service revenue
- $11,682,610
- Investment income
- $668,839
- Other revenue
- $13,028
Expenses
- Grants and similar amounts paid
- $1,177,113
- Compensation of officers, directors and key employees
- $935,116
- Other salaries and wages
- $6,489,808
- Salaries, compensation and benefits (total)
- $9,692,085
- Professional fundraising fees
- $125,000
- Legal fees
- $55,868
- Accounting fees
- $14,834
- Occupancy
- $1,101,470
- Depreciation
- $1,192,274
- Program services (functional)
- $11,711,108
- Management and general (functional)
- $3,115,619
- Fundraising (functional)
- $427,715
Balance sheet and other
- Total assets, start of year
- $38,306,732
- Total assets, end of year
- $51,804,798
- Total liabilities, end of year
- $22,743,677
- Net assets, end of year
- $29,061,121
- Land, buildings and equipment
- $19,490,688
- Publicly traded securities
- $12,819,335
- Net assets without donor restrictions
- $27,970,507
- Net assets with donor restrictions
- $1,090,614
- Gross receipts
- $15,261,584
- Employees
- 90
- Volunteers
- 22
- Year formed
- 1963
- State of legal domicile
- NY
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.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| MIMI BASSO | HEAD OF SCHOOL Trustee or director, Officer | 40 | $471,518 | $63,031 |
| MATTHEW BLOOM | CFO Officer | 40 | $185,241 | $59,038 |
| AMY STONEY | DIRECTOR OF OPERATIONS Highest-paid employee | 40 | $192,834 | $22,532 |
| MELISSA MACK | ASSOCIATE DIRECTOR Highest-paid employee | 40 | $165,433 | $37,948 |
| LISANNE PINCIOTTI | DIRECTOR OF TEP Key employee | 40 | $166,583 | $34,263 |
| KATHERINE FORDNEY | EDUCATIONAL DIRECTOR Highest-paid employee | 40 | $144,025 | $41,203 |
| NADINE CARROLL | ASSOC. HEAD OF SCHOOL Highest-paid employee | 40 | $157,891 | $20,148 |
| GRETCHEN AMBERG SLACK | HEAD TEACHER Highest-paid employee | 40 | $136,157 | $31,688 |
| IVA MILLS | VICE-PRESIDENT Trustee or director, Officer | 2 | $0 | $0 |
| DANA BLISS | VICE-PRESIDENT Trustee or director, Officer | 2 | $0 | $0 |
| SCOTT LI | TREASURER Trustee or director, Officer | 2 | $0 | $0 |
| TENILLE PHAM SHELTON | SECRETARY Trustee or director, Officer | 2 | $0 | $0 |
| MICHAEL CAPILOUTO | TRUSTEE Trustee or director | 2 | $0 | $0 |
| NIKKI CHASE-LEVIN | PRESIDENT Trustee or director, Officer | 2 | $0 | $0 |
| STEVEN HAN | TRUSTEE Trustee or director | 2 | $0 | $0 |
17 more people on this return
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| GEOFFREY KARAPETYAN | TRUSTEE Trustee or director | 2 | $0 |
| ANKUR KESWANI | TRUSTEE Trustee or director | 2 | $0 |
| KURT MILLER | TRUSTEE Trustee or director | 2 | $0 |
| YASMIN NOZARI | TRUSTEE Trustee or director | 2 | $0 |
| CHRISTINA WANG | TRUSTEE Trustee or director | 2 | $0 |
| JULIA EMANUEL | TRUSTEE Trustee or director | 2 | $0 |
| AVNER HUSEN | TRUSTEE Trustee or director | 2 | $0 |
| ANNIE KIM | TRUSTEE Trustee or director | 2 | $0 |
| ELLIE BURROWS GLUCK | PARENT REPRESENTATIVE Trustee or director | 4 | $0 |
| CHARLENE SU | TRUSTEE Trustee or director | 2 | $0 |
| KRISTIN CRAWFORD | TRUSTEE Trustee or director | 2 | $0 |
| GREG FELDMAN | TRUSTEE Trustee or director | 2 | $0 |
| ELIZABETH MARTORELLA | TRUSTEE Trustee or director | 2 | $0 |
| JOHN FREDERICK THYE | TRUSTEE Trustee or director | 2 | $0 |
| ALEX WASCH | TRUSTEE Trustee or director | 2 | $0 |
| ELIZABETH TYNDELL | TRUSTEE Trustee or director | 2 | $0 |
| JORDAN BLITZER | PARENT REPRESENTATIVE Trustee or director | 4 | $0 |
990 for the year ended June 30, 2024: 38 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| MIMI BASSO | HEAD OF SCHOOL Trustee or director, Officer | 40 | $453,477 | $77,332 |
| MATTHEW BLOOM | CFO Officer | 40 | $180,745 | $53,771 |
| AMY STONEY | DIRECTOR OF OPERATIONS Highest-paid employee | 40 | $177,153 | $19,695 |
| MELISSA MACK | ASSOC HEAD Highest-paid employee | 40 | $160,719 | $34,980 |
| LISANNE PINCIOTTI | DIRECTOR OF TEP Key employee | 40 | $159,653 | $30,691 |
| JUDY LYONS | DIR OF ADMIN Highest-paid employee | 40 | $127,918 | $30,893 |
| MARGOT MACK | ASSISTANT TEACHER Highest-paid employee | 40 | $121,096 | $29,194 |
| GRETCHEN AMBERG SLACK | HEAD TEACHER Highest-paid employee | 40 | $122,783 | $26,640 |
| IVA MILLS | PRESIDENT Trustee or director, Officer | 2 | $0 | $0 |
| MYLES AMEND | VICE PRESIDENT THRU 9/23 Trustee or director, Officer | 2 | $0 | $0 |
| SCOTT LI | TREASURER Trustee or director, Officer | 2 | $0 | $0 |
| TENILLE PHAM SHELTON | SECRETARY Trustee or director, Officer | 2 | $0 | $0 |
| MICHAEL CAPILOUTO | TRUSTEE Trustee or director | 2 | $0 | $0 |
| LAURA BASMADJIAN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| DANA BLISS | TRUSTEE Trustee or director | 2 | $0 | $0 |
| JENNIFER CONWAY | TRUSTEE Trustee or director | 2 | $0 | $0 |
| NIKKI CHASE-LEVIN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| JOSEPH GILBERT | TRUSTEE Trustee or director | 2 | $0 | $0 |
| STEVEN HAN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| GEOFFREY KARAPETYAN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| ANKUR KESWANI | TRUSTEE Trustee or director | 2 | $0 | $0 |
| LILIAN KIM | TRUSTEE Trustee or director | 2 | $0 | $0 |
| ELIZABETH MARTORELLA | TRUSTEE Trustee or director | 2 | $0 | $0 |
| KURT MILLER | TRUSTEE Trustee or director | 2 | $0 | $0 |
| YASMIN NOZARI | TRUSTEE Trustee or director | 2 | $0 | $0 |
| KELLY OPDYKE | TRUSTEE Trustee or director | 2 | $0 | $0 |
| CHRISTINA WANG | TRUSTEE Trustee or director | 2 | $0 | $0 |
| JULIA EMANUEL | TRUSTEE Trustee or director | 2 | $0 | $0 |
| AVNER HUSEN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| ANNIE KIM | TRUSTEE Trustee or director | 2 | $0 | $0 |
| JF THYE | TRUSTEE Trustee or director | 2 | $0 | $0 |
| ELLIE GLUCK | PARENT REPRESENTATIVE Trustee or director | 2 | $0 | $0 |
| CHARLENE SU | PARENT REPRESENTATIVE Trustee or director | 2 | $0 | $0 |
| NADINE CARROLL | TRUSTEE THRU 9/23 Trustee or director | 2 | $0 | $0 |
| MARY PAT DOWHY | TRUSTEE THRU 9/23 Trustee or director | 2 | $0 | $0 |
| MARGUERITE MCNICOLL | TRUSTEE THRU 9/23 Trustee or director | 2 | $0 | $0 |
| NIGELAN LAQUA WILLIAMSON | TRUSTEE THRU 9/23 Trustee or director | 2 | $0 | $0 |
| MARIAJOSE DELGADO | TRUSTEE Trustee or director | 2 | $0 | $0 |
990 for the year ended June 30, 2023: 33 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| MIMI BASSO | HEAD OF SCHOOL Trustee or director, Officer | 40 | $432,600 | $55,361 |
| LISANNE PINCIOTTI | DIRECTOR OF TEP Highest-paid employee | 40 | $153,510 | $30,053 |
| MATTHEW BLOOM | CFO Officer | 40 | $132,557 | $49,151 |
| MELISSA MACK | ASSOC HEAD Highest-paid employee | 40 | $147,000 | $31,556 |
| AMY STONEY | DIRECTOR OF OPERATIONS Highest-paid employee | 40 | $143,260 | $15,910 |
| JUDY LYONS | DIR OF ADMIN Highest-paid employee | 40 | $119,760 | $26,673 |
| DONNA LOVELL | HEAD TEACHER Highest-paid employee | 40 | $111,423 | $14,636 |
| IVA MILLS | PRESIDENT Trustee or director, Officer | 2 | $0 | $0 |
| MYLES AMEND | VICE PRESIDENT Trustee or director, Officer | 2 | $0 | $0 |
| SCOTT LI | TREASURER Trustee or director, Officer | 2 | $0 | $0 |
| TENILLE PHAM SHELTON | SECRETARY Trustee or director, Officer | 2 | $0 | $0 |
| MICHAEL CAPILOUTO | TRUSTEE Trustee or director | 2 | $0 | $0 |
| LAURA BASMADJIAN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| DANA BLISS | TRUSTEE Trustee or director | 2 | $0 | $0 |
| JENNIFER CONWAY | TRUSTEE Trustee or director | 2 | $0 | $0 |
| NADINE CARROLL | TRUSTEE Trustee or director | 2 | $0 | $0 |
| NIKKI CHASE-LEVIN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| MARY PAT DOWHY | TRUSTEE Trustee or director | 2 | $0 | $0 |
| JOE GILBERT | TRUSTEE Trustee or director | 2 | $0 | $0 |
| STEVEN HAN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| GEOFFREY KARAPETYAN | TRUSTEE Trustee or director | 2 | $0 | $0 |
| ANKUR KESWANI | TRUSTEE Trustee or director | 2 | $0 | $0 |
| LILIAN KIM | TRUSTEE Trustee or director | 2 | $0 | $0 |
| ELIZABETH MARTORELLA | TRUSTEE Trustee or director | 2 | $0 | $0 |
| MARGUERITE MCNICOLL | TRUSTEE Trustee or director | 2 | $0 | $0 |
| KURT MILLER | TRUSTEE Trustee or director | 2 | $0 | $0 |
| YASMIN NOZARI | TRUSTEE Trustee or director | 2 | $0 | $0 |
| KELLY OPDYKE | TRUSTEE Trustee or director | 2 | $0 | $0 |
| CHRISTINA WANG | TRUSTEE Trustee or director | 2 | $0 | $0 |
| NIGELAN LAQUA WILLIAMSON | TRUSTEE Trustee or director | 2 | $0 | $0 |
| MARIA JOSE DELGARDO | PARENT REPRESENTATIVE Trustee or director | 2 | $0 | $0 |
| CHARLENE SU | PARENT REPRESENTATIVE Trustee or director | 2 | $0 | $0 |
| MELISSA SILVESTRI | FACULTY REPRESENTATIVE Trustee or director | 2 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- 309 W 92ND ST, NEW YORK, NY 10025-7213
- Principal officer (990 for 2024)
- MARY D BASSO, 309 WEST 92ND STREET, NEW YORK, NY 10025
- Signed the 990
- MATTHEW BLOOM, CFO
- Phone
- (212) 662-8000
- Website
- WWW.WSMSNYC.ORG
- Return prepared by
- SAX ADVISORS LLC
Mission
WE PREPARE CHILDREN TO BE RESILIENT, CREATIVE AND INDEPENDENT PROBLEM SOLVERS. WE ARE LEADERS IN TEACHING MONTESSORI PRINCIPLES AND INCORPORATE THE BEST PRACTICES OF MODERN EARLY CHILDHOOD EDUCATION IN OUR CLASSROOMS.WEST SIDE MONTESSORI SCHOOL IS A VIBRANT, COLLABORATIVE COMMUNITY OF PASSIONATE TEACHERS, JOYFUL CHILDREN AND ENGAGED PARENTS. OUR DIVERSE COMMUNITY IS A REFLECTION OF THE CITY IN WHICH WE LIVE.
Program accomplishments
- THE ORGANIZATION'S PRIMARY EXEMPT PURPOSE AND ITS LARGEST PROGRAM SERVICE, IS TO PROVIDE EARLY EDUCATION TO 150-200 CHILDREN FROM PRE-K THROUGH KINDERGARTEN.Expenses $10,827,783 · grants $1,131,388 · revenue $10,740,565
- THIS ORGANIZATION ALSO OPERATES A MONTESSORI TEACHER EDUCATION PROGRAM, THE WSMS-TEP PROGRAM, FOR TEACHERS WHO WISH TO OBTAIN THEIR MONTESSORI TEACHING CREDENTIALS.Expenses $870,900 · grants $33,300 · revenue $942,045
- PROVIDING GENERAL EDUCATION SUPPORT TO UNRELATED ORGANIZATIONS WITHIN THE COMMUNITY.Expenses $12,425 · grants $12,425
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 year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | June 30, 2026 | November 16, 2026 | Not due yet |
| 2024 | June 30, 2025 | November 17, 2025 | 990 on file |
| 2023 | June 30, 2024 | November 15, 2024 | 990 on file |
IRS record
- EIN
- 13-1992185
- 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
- June
- Files
- Form 990 or 990-EZ
- Assets (IRS master file)
- $51,804,798
- Income (IRS master file)
- $15,261,584
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | June 2025 | $15,094,740 | $15,254,442 | $51,804,798 | XML |
| 990 | June 2024 | $12,664,529 | $13,391,460 | $38,306,732 | XML |
| 990 | June 2023 | $11,284,083 | $11,752,766 | $37,420,941 | XML |
| 990 | June 2022 | – | – | – | IRS |
| 990 | June 2021 | – | – | – | IRS |
| 990 | June 2019 | – | – | – | 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 13-1992185).
Questions about WEST SIDE MONTESSORI SCHOOL
- What is the EIN of WEST SIDE MONTESSORI SCHOOL?
- The employer identification number (EIN) of WEST SIDE MONTESSORI SCHOOL is 13-1992185.
- Is WEST SIDE MONTESSORI SCHOOL tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1965.
- Are donations to WEST SIDE MONTESSORI SCHOOL tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does WEST SIDE 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 WEST SIDE MONTESSORI SCHOOL 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 WEST SIDE MONTESSORI SCHOOL 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 WEST SIDE MONTESSORI SCHOOL?
- The 990 for the year ended June 30, 2025 names MARY D BASSO.
- Who are the officers and directors of WEST SIDE MONTESSORI SCHOOL?
- The 990 for the year ended June 30, 2025 lists 32 people; 8 received compensation from the organization, the highest $471,518 (MIMI BASSO, HEAD OF SCHOOL).
- How much revenue does WEST SIDE MONTESSORI SCHOOL have?
- On its 990 for the year ended June 30, 2025 it reported revenue of $15,094,740, expenses of $15,254,442 and total assets of $51,804,798 at year end.
Other nonprofits in NEW YORK
- NEW YORK UNIVERSITY EIN 13-5562308 · last filed 990 for 2025
- HEALTHFIRST PHSP INC EIN 13-3783732 · last filed 990 for 2024
- THE NEW YORK AND PRESBYTERIAN HOSPITAL EIN 13-3957095 · last filed 990 for 2024
- NYU LANGONE HOSPITALS EIN 13-3971298 · last filed 990 for 2025
- MEMORIAL SLOAN-KETTERING CANCER CENTER EIN 91-2154267 · last filed 990 for 2024
- TRUSTEES OF COLUMBIA UNIVERSITY EIN 13-5598093 · last filed 990 for 2025
- HEALTHFIRST HEALTH PLAN INC EIN 11-3029569 · last filed 990 for 2024
- GS DONOR ADVISED PHILANTHROPY FUND FOR WEALTH MANAGEMENT INC EIN 31-1774905 · last filed 990 for 2024