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WEST SIDE MONTESSORI SCHOOL

EIN 13-1992185 NEW YORK, NY

Largest nonprofits in New York

Revenue 2024
$15,094,740
Expenses 2024
$15,254,442

Program services were 76.8% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
Classification
2000
Street
309 W 92ND ST

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Mission and programs · 2024

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.

Activities or mission (Part I)

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.

  • 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

As filed on the 2024 return. The filer continues this part on Schedule O, which is not shown here.

Officers and directors · 2024

As listed in Part VII of the 2024 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • Mimi Basso

    HEAD OF SCHOOL

    Total calculated
    $534,549
    From this org
    $471,518
    From related orgs
    $0
    Other
    $63,031
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $391,518
    Bonus
    $80,000
    Other
    $0
    Deferred
    $44,850
    Nontaxable benefits
    $18,181
    Filer's total
    $534,549
  • Iva Mills

    VICE-PRESIDENT

    Total calculated
    $0
    Hours/week
    2
  • Dana Bliss

    VICE-PRESIDENT

    Total calculated
    $0
    Hours/week
    2
  • Scott Li

    TREASURER

    Total calculated
    $0
    Hours/week
    2
  • Tenille Pham Shelton

    SECRETARY

    Total calculated
    $0
    Hours/week
    2
  • Michael Capilouto

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Nikki Chase-Levin

    PRESIDENT

    Total calculated
    $0
    Hours/week
    2
  • Steven Han

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Geoffrey Karapetyan

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Ankur Keswani

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Kurt Miller

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Yasmin Nozari

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Christina Wang

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Julia Emanuel

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Avner Husen

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Annie Kim

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Ellie Burrows Gluck

    PARENT REPRESENTATIVE

    Total calculated
    $0
    Hours/week
    4
  • Charlene Su

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Kristin Crawford

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Greg Feldman

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Elizabeth Martorella

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • John Frederick Thye

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Alex Wasch

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Elizabeth Tyndell

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2
  • Jordan Blitzer

    PARENT REPRESENTATIVE

    Total calculated
    $0
    Hours/week
    4

The first 25 listed. Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. A Schedule J breakdown is as filed: base pay, bonus, other, deferred compensation and nontaxable benefits from this organization, with any from related organizations beside each, and the filer's own total. It is shown with the Part VII listing of the same name on the same return. The form gives no key between the two, so that pairing is ours, and is marked matched by us. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $15,094,740
    Expenses
    $15,254,442
    Contributions
    $2,730,263
    Grants paid
    $1,177,113
  • 2023
    Revenue
    $12,664,529
    Expenses
    $13,391,460
    Contributions
    $1,300,316
    Grants paid
    $1,454,788
  • 2022
    Revenue
    $11,284,083
    Expenses
    $11,752,766
    Contributions
    $1,110,134
    Grants paid
    $1,547,011

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

  • 2021 · 990

    Revenue
    $10,367,667
    Expenses
    $10,616,513
    Assets (EOY)
    $34,513,067
  • 2020 · 990

    Revenue
    $12,617,803
    Expenses
    $10,250,637
    Assets (EOY)
    $36,738,175
  • 2019 · 990

    Revenue
    $10,542,848
    Expenses
    $10,016,105
    Assets (EOY)
    $33,911,523
  • 2018 · 990

    Revenue
    $10,058,815
    Expenses
    $10,301,784
    Assets (EOY)
    $34,703,581
  • 2017 · 990

    Revenue
    $8,327,876
    Expenses
    $8,587,542
    Assets (EOY)
    $33,849,938
  • 2016 · 990

    Revenue
    $8,034,155
    Expenses
    $8,150,274
    Assets (EOY)
    $32,184,705
  • 2015 · 990

    Revenue
    $8,347,216
    Expenses
    $7,466,966
    Assets (EOY)
    $30,791,651
  • 2014 · 990

    Revenue
    $7,179,585
    Expenses
    $6,759,973
    Assets (EOY)
    $28,881,412
  • 2013 · 990

    Revenue
    $6,478,359
    Expenses
    $6,632,380
    Assets (EOY)
    $28,533,661
  • 2012 · 990

    Revenue
    not reported
    Expenses
    $6,231,099
    Assets (EOY)
    $26,626,411

Nonprofiteer parses Forms 990, 990-EZ and 990-PF, in a window of recent tax years. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all. Showing the 10 most recent; the API carries the rest.

Grants made

  • BRICK CHURCH SCHOOL

    $10,000

    2023 EDUCATIONAL PROGRAMMING

  • BRICK CHURCH SCHOOL

    $10,000

    2024 EDUCATIONAL PROGRAMMING

Where these grants went next →

Grants received

The 10 largest by cash amount. The API serves every itemized grant.

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 13 October 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 13 October 2026 and read 1 November 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.