Nonprofit · EIN 20-3874924
MICHAEL & SALLY MAYER FAMILYFOUNDATION
Tax-exempt · HILLSBOROUGH, CA 94010
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990-PF | $105,710 | $134,348 | -$28,638 | $1,712,858 | $0 | $1,712,858 |
| December 31, 2024 | 990-PF | $68,483 | $89,601 | -$21,118 | $1,750,790 | $3,424 | $1,747,366 |
| December 31, 2023 | 990-PF | $23,827 | $75,721 | -$51,894 | $1,745,763 | $0 | $1,745,763 |
Financial details: 990-PF for the year ended December 31, 2025
Revenue
- Dividends
- $36,094
- Net gain from sales of assets
- $70,049
- Other income
- -$433
Expenses
- Grants and similar amounts paid
- $90,600
- Compensation of officers, directors and key employees
- $0
- Disbursements for charitable purposes
- $90,625
- Excise tax on investment income
- $862
Balance sheet and other
- Total assets, start of year
- $1,750,790
- Total assets, end of year
- $1,712,858
- Total liabilities, end of year
- $0
- Net assets, end of year
- $1,712,858
- Fair market value of assets
- $1,778,695
- Qualifying distributions
- $90,625
- Net investment income
- $105,710
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-PF for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| SALLY MAYER 565 EL CERRITO AVE, HILLSBOROUGH, CA 94010 | PRESIDENT | 5 | $0 |
| MICHAEL MAYER 565 EL CERRITO AVE, HILLSBOROUGH, CA 94010 | TREASURER | 5 | $0 |
| ROSEMARY-MAYER HINTZ 363 LA CUESTA DR, PORTOLA VALLEY, CA 94028 | SECRETARY | 1 | $0 |
| DAVID MAYER 2701 MASON LANE, SAN MATEO, CA 94403 | DIRECTOR | 1 | $0 |
| STEPHEN MAYER 5009 NORTHEAST BROADWAY, PORTLAND, OR 97213 | DIRECTOR | 1 | $0 |
| GREG HINTZ 363 LA CUESTA DR, PORTOLA VALLEY, CA 94028 | DIRECTOR | 1 | $0 |
| ANDREA MAYER 5009 NORTHEAST BROADWAY, PORTLAND, OR 97213 | DIRECTOR | 1 | $0 |
990-PF for the year ended December 31, 2024: 7 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| SALLY MAYER 565 EL CERRITO AVE, HILLSBOROUGH, CA 94010 | PRESIDENT | 5 | $0 |
| MICHAEL MAYER 565 EL CERRITO AVE, HILLSBOROUGH, CA 94010 | TREASURER | 5 | $0 |
| ROSEMARY-MAYER HINTZ 363 LA CUESTA DR, PORTOLA VALLEY, CA 94028 | SECRETARY | 1 | $0 |
| DAVID MAYER 2701 MASON LANE, SAN MATEO, CA 94403 | DIRECTOR | 1 | $0 |
| STEPHEN MAYER 5009 NORTHEAST BROADWAY, PORTLAND, OR 97213 | DIRECTOR | 1 | $0 |
| GREG HINTZ 363 LA CUESTA DR, PORTOLA VALLEY, CA 94028 | DIRECTOR | 1 | $0 |
| ANDREA MAYER 5009 NORTHEAST BROADWAY, PORTLAND, OR 97213 | DIRECTOR | 1 | $0 |
990-PF for the year ended December 31, 2023: 7 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| SALLY MAYER 565 EL CERRITO AVE, HILLSBOROUGH, CA 94010 | PRESIDENT | 1 | $0 |
| MICHAEL MAYER 565 EL CERRITO AVE, HILLSBOROUGH, CA 94010 | TREASURER | 12 | $0 |
| ROSEMARY-MAYER HINTZ 363 LA CUESTA DR, PORTOLA VALLEY, CA 94028 | SECRETARY | 1 | $0 |
| DAVID MAYER 2701 MASON LANE, SAN MATEO, CA 94403 | DIRECTOR | 1 | $0 |
| STEPHEN MAYER 5009 NORTHEAST BROADWAY, PORTLAND, OR 97213 | DIRECTOR | 1 | $0 |
| GREG HINTZ 363 LA CUESTA DR, PORTOLA VALLEY, CA 94028 | DIRECTOR | 1 | $0 |
| ANDREA MAYER 5009 NORTHEAST BROADWAY, PORTLAND, OR 97213 | DIRECTOR | 1 | $0 |
Address and contacts
- Address (IRS master file)
- 565 EL CERRITO AVE, HILLSBOROUGH, CA 94010-6821
- In care of
- % ROSEMARY MAYER
- Signed the 990-PF
- MICHAEL MAYER, DIRECTOR
- Phone
- (650) 270-9203
- Return prepared by
- SD MAYER & ASSOCIATES LLP
California records
California keeps its own records of charities and corporations. Search them by EIN 20-3874924 or by the name MICHAEL & SALLY MAYER FAMILYFOUNDATION.
- 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)
What it must file and when
IRS records say it files Form 990-PF. Private foundations file every year. 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 | 990-PF on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990-PF on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990-PF on file |
IRS record
- EIN
- 20-3874924
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Private non-operating foundation
- Donations deductible (Pub 78)
- Private foundation, 30% limit
- Exempt since
- 2006
- Accounting year ends
- December
- Files
- Form 990-PF
- Category (NTEE)
- Philanthropy, voluntarism and grantmaking foundations (T20)
- Assets (IRS master file)
- $1,712,858
- Income (IRS master file)
- $4,119,098
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-PF | December 2025 | $105,710 | $134,348 | $1,712,858 | XML |
| 990-PF | December 2024 | $68,483 | $89,601 | $1,750,790 | IRS |
| 990-PF | December 2023 | $23,827 | $75,721 | $1,745,763 | XML |
| 990-PF | December 2022 | – | – | – | IRS |
| 990-PF | December 2021 | – | – | – | IRS |
| 990-PF | December 2020 | – | – | – | 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 20-3874924).
Questions about MICHAEL & SALLY MAYER FAMILYFOUNDATION
- What is the EIN of MICHAEL & SALLY MAYER FAMILYFOUNDATION?
- The employer identification number (EIN) of MICHAEL & SALLY MAYER FAMILYFOUNDATION is 20-3874924.
- Is MICHAEL & SALLY MAYER FAMILYFOUNDATION tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2006.
- Are donations to MICHAEL & SALLY MAYER FAMILYFOUNDATION tax-deductible?
- Yes. It is listed in IRS Publication 78 (Private foundation, 30% limit).
- Which annual return does MICHAEL & SALLY MAYER FAMILYFOUNDATION file?
- Form 990-PF. Private foundations file every year.
- When is the next return of MICHAEL & SALLY MAYER FAMILYFOUNDATION due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did MICHAEL & SALLY MAYER FAMILYFOUNDATION last file with the IRS?
- The latest return in the IRS public files is the 990-PF for the year ended December 2025.
- Who are the officers and directors of MICHAEL & SALLY MAYER FAMILYFOUNDATION?
- The 990-PF for the year ended December 31, 2025 lists 7 people; 0 received compensation from the organization.
- How much revenue does MICHAEL & SALLY MAYER FAMILYFOUNDATION have?
- On its 990-PF for the year ended December 31, 2025 it reported revenue of $105,710, expenses of $134,348 and total assets of $1,712,858 at year end.
Other nonprofits in HILLSBOROUGH
- VISU FOUNDATION INC EIN 41-2559662 · last filed 990-PF for 2025
- JIN AND XIAQING WU FAMILY FOUNDATION EIN 46-1542945 · last filed 990-PF for 2025
- MICHAEL AND CATHERINE PODELL FUND EIN 20-3483888 · last filed 990-PF for 2024
- CAROLANDS FOUNDATION EIN 46-1631709 · last filed 990-PF for 2025
- GOVIL AGRAWAL FAMILY FOUNDATION EIN 99-4837307 · last filed 990-PF for 2024
- HAN AND JIANG FAMILY FOUNDATION EIN 84-3304301 · last filed 990-PF for 2025
- HILLSBOROUGH CONCOURS DELEGANCE FOUNDATION EIN 36-4668800 · last filed 990 for 2024
- CYNTHIA AND MERRILL MAGOWAN FAMILY FOUNDATION INC EIN 20-1511055 · last filed 990-PF for 2025
All nonprofits in HILLSBOROUGH · California · Philanthropy, voluntarism and grantmaking foundations