Form 15644 windows opening in September 2026
Groups whose yearly Form 15644 window opens in September 2026: usually those whose fiscal year ends in December. Useful for planning a season of filings.
IRS EO BMF, posted Oct 13, 2026
10 groups. Sorted by chapters on file, largest first.
- United States Power Squadrons
- Harmony Inc
- Minnesota Dairy Herd Improvement Association
- California Association for Medical Laboratory Technology
- Society for Information Display
- National Caravan of El Hajj
- Phi Chi Medical Fraternity Inc
- Michigan State Medical Society
- Delta Phi Alpha National Honorary German Fraternity
- XI Psi Phi Fraternity