Nonprofit · EIN 36-4323606
KOROLUK FOUNDATION
Tax-exempt · NAPERVILLE, IL 60564
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990-PF | $272,235 | $271,718 | $517 | $5,243,795 | $0 | $5,243,795 |
| December 31, 2024 | 990-PF | $1,374,936 | $237,338 | $1,137,598 | $5,243,278 | $0 | $5,243,278 |
| December 31, 2023 | 990-PF | $209,595 | $248,577 | -$38,982 | $4,105,680 | $0 | $4,105,680 |
Financial details: 990-PF for the year ended December 31, 2025
Revenue
- Dividends
- $21,990
- Interest
- $249,745
- Net gain from sales of assets
- $500
Expenses
- Grants and similar amounts paid
- $265,000
- Disbursements for charitable purposes
- $265,000
- Excise tax on investment income
- $3,784
Balance sheet and other
- Total assets, start of year
- $5,243,278
- Total assets, end of year
- $5,243,795
- Total liabilities, end of year
- $0
- Net assets, end of year
- $5,243,795
- Fair market value of assets
- $5,254,955
- Qualifying distributions
- $265,000
- Net investment income
- $272,235
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 |
|---|---|---|---|
| Del Marie Koroluk 3943 Littlestone Circle, Naperville, IL 60564 | Treasurer | 1 | $0 |
| Theodore Koroluk 3943 Littlestone Circle, Naperville, IL 60564 | President | 2 | $0 |
| Aleksandr Kalinin 2226 S Highland Avenue, Berwyn, IL 60402 | Director | 0 | $0 |
| Theodora Heihn 175 NBinkley Street, Soldatna, AK 99669 | Secretary | 0 | $0 |
990-PF for the year ended December 31, 2024: 4 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Del Marie Koroluk 3943 Littlestone Circle, Naperville, IL 60564 | Treasurer | 1 | $0 |
| Theodore Koroluk 3943 Littlestone Circle, Naperville, IL 60564 | President | 2 | $0 |
| Aleksandr Kalinin 2226 S Highland Avenue, Berwyn, IL 60402 | Director | 0 | $0 |
| Theodora Heihn 175 N Brinkley Street, Soldatna, AK 99669 | Secretary | 0 | $0 |
990-PF for the year ended December 31, 2023: 5 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Del Marie Koroluk 3943 Littlestone Circle, Naperville, IL 60564 | Treasurer | 0 | $0 |
| Theodore Koroluk 3943 Littlestone Circle, Naperville, IL 60564 | President | 0 | $0 |
| Aleksandr Kalinin 2226 S Highland Avenue, Berwyn, IL 60402 | Director | 0 | $0 |
| Craig Cobine 111 E Jefferson, Naperville, IL 60540 | Director | 0 | $0 |
| Theodora Heihn 175 N Brinkley Street, Soldatna, AK 99669 | Secretary | 2 | $0 |
Address and contacts
- Address (IRS master file)
- 3943 LITTLESTONE CIR, NAPERVILLE, IL 60564-5918
- In care of
- % LUCY KOROLUK
- Signed the 990-PF
- Theodore Koroluk, President
- Phone
- (760) 808-2628
- Return prepared by
- Gritis & Associates Ltd
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
- 36-4323606
- 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
- 2001
- Accounting year ends
- December
- Files
- Form 990-PF
- Category (NTEE)
- Philanthropy, voluntarism and grantmaking foundations (T22)
- Assets (IRS master file)
- $5,243,795
- Income (IRS master file)
- $772,235
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-PF | December 2025 | $272,235 | $271,718 | $5,243,795 | XML |
| 990-PF | December 2024 | $1,374,936 | $237,338 | $5,243,278 | XML |
| 990-PF | December 2023 | $209,595 | $248,577 | $4,105,680 | XML |
| 990-PF | December 2022 | – | – | – | IRS |
| 990-PF | December 2021 | – | – | – | IRS |
| 990-PF | December 2020 | – | – | – | IRS |
| 990-PF | December 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 36-4323606).
Questions about KOROLUK FOUNDATION
- What is the EIN of KOROLUK FOUNDATION?
- The employer identification number (EIN) of KOROLUK FOUNDATION is 36-4323606.
- Is KOROLUK FOUNDATION tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2001.
- Are donations to KOROLUK FOUNDATION tax-deductible?
- Yes. It is listed in IRS Publication 78 (Private foundation, 30% limit).
- Which annual return does KOROLUK FOUNDATION file?
- Form 990-PF. Private foundations file every year.
- When is the next return of KOROLUK FOUNDATION 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 KOROLUK FOUNDATION 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 KOROLUK FOUNDATION?
- The 990-PF for the year ended December 31, 2025 lists 4 people; 0 received compensation from the organization.
- How much revenue does KOROLUK FOUNDATION have?
- On its 990-PF for the year ended December 31, 2025 it reported revenue of $272,235, expenses of $271,718 and total assets of $5,243,795 at year end.
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