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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 27-0207865

MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP

Tax-exempt (reinstated) · SEATTLE, WA 98115

Address and contacts

Address (IRS master file)
4107 NE 96TH ST, SEATTLE, WA 98115-2541
In care of
% MARAT TSELNIK DDS
Mailing address (990-N for 2025)
4107 NE 96th St, Seattle WA 98115
Principal officer (990-N for 2025)
Leila Tarsa, 5665 Meadows Rd Ste 105, Lake Oswego OR 97035

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, 2025Check at the IRS
2023December 31, 2023May 15, 2024Check at the IRS

File the 2026 990-N for MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP

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

IRS record

EIN
27-0207865
Tax-exempt status
501(c)(6): Business league or chamber of commerce
Donations deductible
No
Exempt since
2025
Accounting year ends
December
Files
Form 990-N (e-Postcard)
Category (NTEE)
Health care (E03)

Revocation and reinstatement

Exemption revoked
May 15, 2024
Posted by the IRS
November 14, 2025
Reinstated
Effective May 15, 2024

From the IRS automatic revocation list: organizations that did not file a required return or e-Postcard for three consecutive years.

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Leila Tarsa
December 31, 2025≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Elizabeth Takamori
December 31, 2020≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Elizabeth Takamori
December 31, 2019≤ $50,000 receipts––e-Postcard
990-N for 2018
Officer: Elizabeth Takamori
December 31, 2018≤ $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 27-0207865).

Questions about MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP

What is the EIN of MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP?
The employer identification number (EIN) of MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP is 27-0207865.
Is MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP tax-exempt?
Yes. The IRS revoked its exemption on May 15, 2024 and reinstated it effective May 15, 2024.
Are donations to MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP tax-deductible?
No. The IRS master file says contributions to it are not deductible.
Which annual return does MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP 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 MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP 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 MARSHALL BAUMGARTNER ENDODONTIC STUDY GROUP?
The 990-N for 2025 names Leila Tarsa.

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