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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 26-3439978

WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS

Also known as SEATTLE CHAPTER

Tax-exempt · SEATTLE, WA 98107

Address and contacts

Address (IRS master file)
617 NW 44TH ST, SEATTLE, WA 98107-4432
In care of
% JOHN SCHAUFELBERGER
Mailing address (990-N for 2025)
617 NW 44th Street, Seattle WA 98107
Principal officer (990-N for 2025)
Jon Mathison, 617 NW 44th Street, Seattle WA 98107

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 June, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025June 30, 2026November 16, 2026990-N on file
2024June 30, 2025November 17, 2025990-N on file
2023June 30, 2024November 15, 2024990-N on file

File the 2026 990-N for WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS

Due November 15, 2027 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
26-3439978
Tax-exempt status
501(c)(6): Business league or chamber of commerce
Donations deductible
No
Exempt since
2009
Accounting year ends
June
Files
Form 990-N (e-Postcard)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Jon Mathison
June 30, 2026≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Jon Mathison
June 30, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Jon Mathison
June 30, 2024≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: John Mathison
June 30, 2023≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Jon Mathison
June 30, 2021≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Jon Mathison
June 30, 2020≤ $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 26-3439978).

Questions about WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS

What is the EIN of WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS?
The employer identification number (EIN) of WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS is 26-3439978.
Is WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(6) since 2009.
Are donations to WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS tax-deductible?
No. The IRS master file says contributions to it are not deductible.
Which annual return does WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS due?
The return for tax year 2026 (the year ending June 30, 2027) is due November 15, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
When did WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS last file with the IRS?
The latest return in the IRS public files is the 990-N for 2025 for the year ended June 30, 2026.
Who is the principal officer of WASHINGTON SOCIETY OF PROFESSIONAL ENGINEERS?
The 990-N for 2025 names Jon Mathison.

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