Skip to main content
IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 57-1109460

EXPLORER CRUISES MARINE SCIENCE PROJECT

Tax-exempt · MT PLEASANT, SC 29466

Address and contacts

Address (IRS master file)
2117 SHELL RING CIR, MT PLEASANT, SC 29466-8527
In care of
% KEITH S GRYBOWSKI
Mailing address (990-N for 2025)
2117 Shell Ring Circle, Mount Pleasant SC 29466
Principal officer (990-N for 2025)
Keith S Grybowski, 2117 Shell Ring Circle, Mount Pleasant SC 29466

What it must file and when

IRS records say it files Form 990-N (e-Postcard). Gross receipts normally $50,000 or less. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025December 31, 2025May 15, 2026990-N on file
2024December 31, 2024May 15, 2025990-N on file
2023December 31, 2023May 15, 2024990-N on file

File the 2026 990-N for EXPLORER CRUISES MARINE SCIENCE PROJECT

Due May 17, 2027 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
57-1109460
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
2001
Accounting year ends
December
Files
Form 990-N (e-Postcard)
Category (NTEE)
Education (B80)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Keith S Grybowski
December 31, 2025≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Keith S Grybowski
December 31, 2024≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Keith Grybowski
December 31, 2023≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: Keith Grybowski
December 31, 2022≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Keith Grybowski
December 31, 2020≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Keith S Grybowski
December 31, 2019≤ $50,000 receipts––e-Postcard

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 57-1109460).

Questions about EXPLORER CRUISES MARINE SCIENCE PROJECT

What is the EIN of EXPLORER CRUISES MARINE SCIENCE PROJECT?
The employer identification number (EIN) of EXPLORER CRUISES MARINE SCIENCE PROJECT is 57-1109460.
Is EXPLORER CRUISES MARINE SCIENCE PROJECT tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2001.
Are donations to EXPLORER CRUISES MARINE SCIENCE PROJECT tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does EXPLORER CRUISES MARINE SCIENCE PROJECT file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of EXPLORER CRUISES MARINE SCIENCE PROJECT 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 EXPLORER CRUISES MARINE SCIENCE PROJECT last file with the IRS?
The latest return in the IRS public files is the 990-N for 2025 for the year ended December 31, 2025.
Who is the principal officer of EXPLORER CRUISES MARINE SCIENCE PROJECT?
The 990-N for 2025 names Keith S Grybowski.

Other nonprofits in MT PLEASANT

All nonprofits in MT PLEASANT · South Carolina · Education