Nonprofit · EIN 77-0132297
MOUNT WILSON INSTITUTE
Tax-exempt · PASADENA, CA 91109
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2024 | 990 | $1,165,408 | $946,377 | $219,031 | $4,258,977 | $29,520 | $4,229,457 |
| December 31, 2023 | 990 | $1,278,483 | $828,510 | $449,973 | $3,667,301 | $3,835 | $3,663,466 |
Financial details: 990 for the year ended December 31, 2024
Revenue
- Contributions, gifts and grants
- $369,340
- Program service revenue
- $485,290
- Investment income
- $88,603
- Net rental income
- $70,364
- Net income from fundraising events
- $82,737
- Net income from sales of inventory
- $62,422
- Other revenue
- $222,175
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $0
- Other salaries and wages
- $364,446
- Salaries, compensation and benefits (total)
- $394,993
- Professional fundraising fees
- $0
- Accounting fees
- $9,729
- Occupancy
- $18,845
- Depreciation
- $80,904
- Program services (functional)
- $797,456
- Management and general (functional)
- $148,921
Balance sheet and other
- Total assets, start of year
- $3,667,301
- Total assets, end of year
- $4,258,977
- Total liabilities, end of year
- $29,520
- Net assets, end of year
- $4,229,457
- Land, buildings and equipment
- $693,042
- Net assets without donor restrictions
- $3,924,792
- Net assets with donor restrictions
- $304,665
- Gross receipts
- $1,309,348
- Employees
- 16
- Volunteers
- 178
- Year formed
- 1986
- State of legal domicile
- CA
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 December 31, 2024, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| MR SAMUEL D HALE | Chairman & CEO Trustee or director, Officer | 1 | $0 |
| CATHERINE HAIGHT | Secretary Trustee or director, Officer | 1 | $0 |
| Mr MICHAEL H HORNER | Trustee Trustee or director | 1 | $0 |
| DR JOSH SIMON | Trustee Trustee or director | 1 | $0 |
| Ms Linda Van Winkle Deacon | Trustee Trustee or director | 1 | $0 |
| KATIE STEINKE | Executive Dir. Trustee or director, Officer | 1 | $0 |
| Mr Scott Hood | CFO Trustee or director, Officer | 1 | $0 |
| KOHNE DAN | COO Trustee or director, Officer | 1 | $0 |
| Mr Mike McIntyre | Trustee Trustee or director | 1 | $0 |
| Mr Timothy Thompson | Trustee Trustee or director | 1 | $0 |
| TOM MENEGHINI | Trustee Trustee or director | 1 | $0 |
990 for the year ended December 31, 2023: 11 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| MR SAMUEL D HALE | Chairman & CEO Trustee or director, Officer | 1 | $0 |
| CATHERINE HAIGHT | Secretary Trustee or director, Officer | 1 | $0 |
| Mr MICHAEL H HORNER | Trustee Trustee or director | 1 | $0 |
| DR JOSH SIMON | Trustee Trustee or director | 1 | $0 |
| Ms Linda Van Winkle Deacon | Trustee Trustee or director | 1 | $0 |
| CATHERINE STEINKE | Executive Dir. Trustee or director | 1 | $0 |
| Mr Scott Hood | Trustee Trustee or director | 1 | $0 |
| KOHNE DAN | Trustee Trustee or director | 1 | $0 |
| Mr Mike McIntyre | Trustee Trustee or director | 1 | $0 |
| Mr Timothy Thompson | Trustee Trustee or director | 1 | $0 |
| JENNY ROSENBERG | Trustee Trustee or director | 1 | $0 |
Address and contacts
- Address (IRS master file)
- PO BOX 94146, PASADENA, CA 91109-4146
- Signed the 990
- DAN KOHNE, COO
- Phone
- (626) 214-8030
- Website
- WWW.MTWILSON.EDU
- Return prepared by
- Gavigan & Company
California records
California keeps its own records of charities and corporations. Search them by EIN 77-0132297 or by the name MOUNT WILSON INSTITUTE.
- Attorney General, Registry of Charities and Fundraisers
- Registration status and filed reports (CT-TR-1, RRF-1)
- Secretary of State, bizfile Online
- Corporation status, entity number, agent for service
- Franchise Tax Board
- Entity status letter (state tax exemption, good standing)
Mission
The Mount Wilson Institute provides access to the facilities of Mount Wilson observatory to visiting scientists, educators and the General public while servicing, maintaining and upgrading the overall facilities of the observatory.
Program accomplishments
- Providing access to the facilities of the Mount Wilson observatory to visiting scientists, educators and general public while servicing, maintaining and upgrading the overall facilities of the observatory.Expenses $797,456 · revenue $485,290
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 December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | Not on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 77-0132297
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (509(a)(2))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1987
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Science and technology (U31Z)
- Assets (IRS master file)
- $4,258,977
- Income (IRS master file)
- $1,309,348
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2024 | $1,165,408 | $946,377 | $4,258,977 | IRS |
| 990 | December 2023 | $1,278,483 | $828,510 | $3,667,301 | XML |
| 990 | December 2022 | $936,896 | $726,349 | $3,205,322 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
| 990 | December 2017 | – | – | – | 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 77-0132297).
Questions about MOUNT WILSON INSTITUTE
- What is the EIN of MOUNT WILSON INSTITUTE?
- The employer identification number (EIN) of MOUNT WILSON INSTITUTE is 77-0132297.
- Is MOUNT WILSON INSTITUTE tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1987.
- Are donations to MOUNT WILSON INSTITUTE tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does MOUNT WILSON INSTITUTE 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 MOUNT WILSON INSTITUTE due?
- The return for tax year 2025 (the year ending December 31, 2025) is due May 15, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did MOUNT WILSON INSTITUTE last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2024.
- Who are the officers and directors of MOUNT WILSON INSTITUTE?
- The 990 for the year ended December 31, 2024 lists 11 people; 0 received compensation from the organization.
- How much revenue does MOUNT WILSON INSTITUTE have?
- On its 990 for the year ended December 31, 2024 it reported revenue of $1,165,408, expenses of $946,377 and total assets of $4,258,977 at year end.
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