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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 26-0136901

US MENTAL MATH FEDERATION INC

Tax-exempt (reinstated) · TEMPE, AZ 85281

Address and contacts

Address (IRS master file)
1215 E LEMON ST APT 121, TEMPE, AZ 85281-4144
In care of
% RUEYIN CHIOU
Mailing address (990-N for 2025)
1215 E LEMON ST APT 121, TEMPE AZ 852814144
Principal officer (990-N for 2025)
Rueyin Chiou, 1350 S Greenfield Rd Unit 1017, MESA AZ 85206

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 US MENTAL MATH FEDERATION INC

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

IRS record

EIN
26-0136901
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
2016
Accounting year ends
June
Files
Form 990-N (e-Postcard)
Category (NTEE)
Education (B28)

Revocation and reinstatement

Exemption revoked
November 15, 2010
Posted by the IRS
August 3, 2011
Reinstated
Effective May 15, 2016

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: Rueyin Chiou
June 30, 2026≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Rueyin Chiou
June 30, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Rueyin Chiou
June 30, 2024≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: Rueyin Chiou
June 30, 2023≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Rueyin Chiou
June 30, 2021≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Rueyin Chiou
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 26-0136901).

Questions about US MENTAL MATH FEDERATION INC

What is the EIN of US MENTAL MATH FEDERATION INC?
The employer identification number (EIN) of US MENTAL MATH FEDERATION INC is 26-0136901.
Is US MENTAL MATH FEDERATION INC tax-exempt?
Yes. The IRS revoked its exemption on November 15, 2010 and reinstated it effective May 15, 2016.
Are donations to US MENTAL MATH FEDERATION INC tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does US MENTAL MATH FEDERATION INC file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of US MENTAL MATH FEDERATION INC 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 US MENTAL MATH FEDERATION INC 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 US MENTAL MATH FEDERATION INC?
The 990-N for 2025 names Rueyin Chiou.

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