Arizona · Nonprofit
The Tiller Foundation
The Tiller Foundation (Arizona) receives grants from 2 organizations whose IRS filings report $10,116 to it, the largest being THE MERICOS FOUNDATION ($10,000). 1 of them have funded it in more than one year.
- Revenue FY2025
- $77k
- Funders on record
- 2
- Grants received
- $10k
- Net assets
- $369k
What The Tiller Foundation does
Mission
Scientific research;corporation is organized exclusively for scientific purposesto support development of new science and technologies that help solving today'sproblems and dificulties;creating and selling unimprinted electrical device that enrich human intentions
As stated on its FY2025 Form 990-EZ.
Program
Public support to conduct scientific activities and to create new science and thechnologies that help solve today's problems and dificulties; creating and selling unimprinted electrical device that enrich human intentions
$84,590 spent100% of program spending
The program described on its FY2025 Form 990-EZ. Program spending in total: $84,590.
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 2023 to 2024, from $181k to $341k (+88%).
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.
2% of The Tiller Foundation’s revenue is contributions — more earned-revenue than three-quarters of its peers (100% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 7 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.
Who funds it, year by year
2020 → 2023: the base held at 1 funder, grant income rose $22 → $32.
1 of 2 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 1% 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 The Tiller Foundation’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
The Tiller Foundation leans on a few funders — its largest provides 99% of grant income and the top three 100%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
Largest funder’s share by year: 2020 100% · 2021 100% · 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
The Tiller Foundation draws 100% of its grant income from funders outside Arizona, across 1 state in all.
Funder states come from each funder’s own filing. $116 arriving through sponsors registered in 1 state 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
The Tiller Foundation's funding has concentrated — grant income rose while the number of funders held roughly flat.
this organization peer median middle 50% of peers· 6,360 health nonprofits under $100k, FY2025
Organizations like The Tiller Foundation
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 Arizona
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Public support
93%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Screen this organization
A dated, signed PDF of the compliance screen for The Tiller Foundation: 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 The Tiller Foundation?
- The Tiller Foundation (Arizona) receives grants from 2 organizations whose IRS filings report $10,116 to it, the largest being THE MERICOS FOUNDATION ($10,000). 1 of them have funded it in more than one year.
- How many funders does The Tiller Foundation have?
- IRS filings report 2 organizations giving $10,116 in grants to The Tiller Foundation, 1 of which have funded it in more than one year.
- Who is the largest funder of The Tiller Foundation?
- THE MERICOS FOUNDATION is the largest funder on record, with $10,000 in grants. The full list of funders is on this page.
- How can an organization like The Tiller Foundation find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Arizona. 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 Tiller →
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 2 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