Nonprofit · EIN 04-6875253
FRANK B MAZER FOUNDATION
Also known as MAZER FRANK B TTEE
Tax-exempt · CAMBRIDGE, MA 02138
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| September 30, 2025 | 990-PF | $346 | $2,825 | -$2,479 | $180,455 | $0 | $180,455 |
| September 30, 2024 | 990-PF | $4,836 | $10,844 | -$6,008 | $486,084 | $0 | $486,084 |
| September 30, 2023 | 990-PF | $28,646 | $18,458 | $10,188 | $584,723 | $0 | $584,723 |
Financial details: 990-PF for the year ended September 30, 2025
Revenue
- Dividends
- $11
- Net gain from sales of assets
- $335
Expenses
- Grants and similar amounts paid
- $2,790
- Disbursements for charitable purposes
- $2,790
- Excise tax on investment income
- $4
Balance sheet and other
- Total assets, start of year
- $486,084
- Total assets, end of year
- $180,455
- Total liabilities, end of year
- $0
- Net assets, end of year
- $180,455
- Fair market value of assets
- $180,455
- Qualifying distributions
- $2,790
- Net investment income
- $346
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 September 30, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| FRANK B MAZER 10 SAVILLE STREET, CAMBRIDGE, MA 021381310 | Trustee | 1 | $0 |
990-PF for the year ended September 30, 2024: 1 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| FRANK B MAZER 10 SAVILLE STREET, CAMBRIDGE, MA 021381310 | Trustee | 4 | $0 |
990-PF for the year ended September 30, 2023: 1 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| FRANK B MAZER 10 SAVILLE STREET, CAMBRIDGE, MA 021381310 | Trustee | 8 | $0 |
Address and contacts
- Address (IRS master file)
- 10 SAVILLE ST, CAMBRIDGE, MA 02138-1310
- In care of
- % FRANK B MAZER
- Signed the 990-PF
- FRANK B MAZER, Trustee
- Phone
- (617) 866-9741
- Return prepared by
- Robert B Abel CPA
What it must file and when
IRS records say it files Form 990-PF. Private foundations file every year. Its accounting year ends in September, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | September 30, 2026 | February 16, 2027 | Not due yet |
| 2024 | September 30, 2025 | February 17, 2026 | 990-PF on file |
| 2023 | September 30, 2024 | February 18, 2025 | 990-PF on file |
IRS record
- EIN
- 04-6875253
- 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
- 1998
- Accounting year ends
- September
- Files
- Form 990-PF
- Category (NTEE)
- Philanthropy, voluntarism and grantmaking foundations (T22J)
- Assets (IRS master file)
- $180,455
- Income (IRS master file)
- $633
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-PF | September 2025 | $346 | $2,825 | $180,455 | XML |
| 990-PF | September 2024 | $4,836 | $10,844 | $486,084 | XML |
| 990-PF | September 2023 | $28,646 | $18,458 | $584,723 | XML |
| 990-PF | September 2022 | – | – | – | IRS |
| 990-PF | September 2021 | – | – | – | IRS |
| 990-PF | September 2020 | – | – | – | IRS |
| 990-PF | September 2018 | – | – | – | 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 04-6875253).
Questions about FRANK B MAZER FOUNDATION
- What is the EIN of FRANK B MAZER FOUNDATION?
- The employer identification number (EIN) of FRANK B MAZER FOUNDATION is 04-6875253.
- Is FRANK B MAZER FOUNDATION tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1998.
- Are donations to FRANK B MAZER FOUNDATION tax-deductible?
- Yes. It is listed in IRS Publication 78 (Private foundation, 30% limit).
- Which annual return does FRANK B MAZER FOUNDATION file?
- Form 990-PF. Private foundations file every year.
- When is the next return of FRANK B MAZER FOUNDATION due?
- The return for tax year 2025 (the year ending September 30, 2026) is due February 16, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did FRANK B MAZER FOUNDATION last file with the IRS?
- The latest return in the IRS public files is the 990-PF for the year ended September 2025.
- Who are the officers and directors of FRANK B MAZER FOUNDATION?
- The 990-PF for the year ended September 30, 2025 lists 1 person; 0 received compensation from the organization.
- How much revenue does FRANK B MAZER FOUNDATION have?
- On its 990-PF for the year ended September 30, 2025 it reported revenue of $346, expenses of $2,825 and total assets of $180,455 at year end.
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