Florida · Nonprofit
MONTESSORI ISLAND CHARTER SCHOOLINC
MONTESSORI ISLAND CHARTER SCHOOLINC (Florida) receives grants from 5 organizations whose IRS filings report $50,188 to it, the largest being COMMUNITY FOUNDATION OF THE FLORIDA KEYS ($19,500). 2 of them have funded it in more than one year, and 90% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- Revenue FY2025
- $3.8M
- Funders on record
- 5
- Grants received
- $50k
- Net assets
- $1.5M
What Montessori Island Charter Schoolinc does
Mission
To provide educational services to local area students in conjunction with monroe county florida. Services are provided to students in grades vpk to 8th grade.
As stated on its FY2025 Form 990.
Programs
Operated charter school in monroe county florida
$3,608,272 spent98% of program spendingOperated charter school in monroe county florida
$76,297 spent2% of program spending
The 2 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $3,684,569.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2021 to 2022, from $1.5M to $3.3M (+117%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2017 84% · 2018 76% · 2019 81% · 2020 88% · 2021 73% · 2022 86% · 2023 87% · 2024 90% · 2025 88%. Grants only. Government contracts and fees sit inside program revenue.
90% of MONTESSORI ISLAND CHARTER SCHOOLINC’s revenue is contributions — more donation-reliant than the typical peer (48% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 9 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Board chair
Rosemary Donnelly
Chair person
As listed on its FY2025 Form 990.
Who funds it, year by year
2017 → 2023: the base held at 1 funder, grant income fell $14k → $337.
4 of 5 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 90% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of MONTESSORI ISLAND CHARTER SCHOOLINC’s funders (the co-funder graph). Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
MONTESSORI ISLAND CHARTER SCHOOLINC leans on a few funders — its largest provides 39% of grant income and the top three 86%; half comes from just 2 funders.
the vertical line marks half of all grant income — 2 funders to its left
100% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund MONTESSORI ISLAND CHARTER SCHOOLINC.
Largest funder’s share by year: 2017 100% · 2018 62% · 2020 100% · 2021 91% · 2022 100% · 2023 100% — broadly stable.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Where its funders are
90% of MONTESSORI ISLAND CHARTER SCHOOLINC's grant income arrives through donor-advised or pass-through sponsors, whose addresses record where the money is held rather than where the donor is. Of the $5k that is directly attributable, 100% of it comes from Florida funders.
Funder states come from each funder’s own filing. $45k arriving through sponsors registered in 4 states is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Against its field
MONTESSORI ISLAND CHARTER SCHOOLINC's revenue grew 61% between 2017 and 2025.
this organization peer median middle 50% of peers· 9,398 education nonprofits $1M–$10M, FY2025
Organizations like MONTESSORI ISLAND CHARTER SCHOOLINC
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In Florida
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
99% of spending goes to programs.
Governance
Screen this organization
A dated, signed PDF of the compliance screen for MONTESSORI ISLAND CHARTER SCHOOLINC: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds MONTESSORI ISLAND CHARTER SCHOOLINC?
- MONTESSORI ISLAND CHARTER SCHOOLINC (Florida) receives grants from 5 organizations whose IRS filings report $50,188 to it, the largest being COMMUNITY FOUNDATION OF THE FLORIDA KEYS ($19,500). 2 of them have funded it in more than one year, and 90% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does MONTESSORI ISLAND CHARTER SCHOOLINC have?
- IRS filings report 5 organizations giving $50,188 in grants to MONTESSORI ISLAND CHARTER SCHOOLINC, 2 of which have funded it in more than one year.
- Who is the largest funder of MONTESSORI ISLAND CHARTER SCHOOLINC?
- COMMUNITY FOUNDATION OF THE FLORIDA KEYS is the largest funder on record, with $19,500 in grants. The full list of funders is on this page.
- How can an organization like MONTESSORI ISLAND CHARTER SCHOOLINC find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Florida. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Montessori Island Charter Schoolinc →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2017–2025), and the filings of 5 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 14, 2026. What this page cannot tell you · view filing