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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 52-1339083

INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY

Tax-exempt · WASHINGTON, DC 20044

Address and contacts

Address (IRS master file)
PO BOX 7769, WASHINGTON, DC 20044-7769
Mailing address (990-N for 2025)
PO Box 7769, Washington DC DC 20044
Principal officer (990-N for 2025)
Michael Dourson, 1250 Ohio Pike, Suite 197, Cincinnati OH 45102

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 INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY

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

IRS record

EIN
52-1339083
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
1986
Accounting year ends
December
Files
Form 990-N (e-Postcard)
Category (NTEE)
Health care (E66Z)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Michael Dourson
December 31, 2025≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Michael Dourson
December 31, 2024≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: David G Sarvadi
December 31, 2023≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: David G Sarvadi
December 31, 2022≤ $50,000 receipts––e-Postcard
990-N for 2021
Officer: David G Sarvadi
December 31, 2021≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: David G Sarvadi
December 31, 2020≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: David G Sarvadi
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 52-1339083).

Questions about INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY

What is the EIN of INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY?
The employer identification number (EIN) of INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY is 52-1339083.
Is INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1986.
Are donations to INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY 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 INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY 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 INTERNATIONAL SOCIETY OF REGULATORY TOXICOLOGY AND PHARMACOLOGY?
The 990-N for 2025 names Michael Dourson.

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