Form 15644 windows opening in December 2026
Groups whose yearly Form 15644 window opens in December 2026: those whose fiscal year ends on Mar 31, 2027. Useful for planning a season of filings.
IRS EO BMF, posted Oct 13, 2026
102 groups. Sorted by chapters on file, largest first.
- Parent Booster USA Inc
- National Association of Letter Carriers
- Brotherhood of Maintenance of Way Employes Division
- Alpha Phi Sigma Inc
- Trout Unlimited Inc
- National Society of the Children of the American Revolution
- Pop Warner Little Scholars Inc
- National Society Colonial Dames Xvii Century
- Free & Accepted Masons of Indiana Grand Lodge
- La Leche League International Inc
- Grand Lodge of Free and Accepted Masons of the State of Michigan
- The Most Worshipful Grand Lodge of Free & Accepted Masons of Florida
- La Leche League of the United States of America
- Ancient Free Masons of South Carolina
- Ancient Free & Accepted Masons of Oklahoma
- International Union Security Police Fire Professionals of America
- United Grand Imperial Coun Knights of Red Cross of Constantine
- Phi Sigma Iota Foreign Language National Honor Society
- American Society of Safety Professionals
- Ancient Free & Accepted Masons of Maine Grand Lodge
- Grand Chapter of Tennessee Order of the Eastern Star
- Most Worshipful Grand Lodge of AF & AM of Kansas
- Construction Financial Management Association
- Order of the Eastern Star Georgia Grand Chapter
- Young Ladies Grand Institute
- Aga
- Institute of Industrial and Systems Engineers Inc
- Order of the Eastern Star of Washington Grand Chapter
- Concerns of Police Survivors
- Garden Club of Indiana Inc
- American Civil Liberties Union Inc
- United Order of Tents of J R Giddings and Jollifee Union
- Order of the Eastern Star of Nebraska Grand Chapter
- Garden Club of Kentucky Inc
- Grand Chapter of Ma Order of the Eastern Star
- National Society of New England Women
- International Federation of Professional & Technical Engineers
- Order of the Eastern Star of Maine
- Soil and Water Conservation Society
- Colonial Dames of America
- La Leche League of Washington
- Order of the Eastern Star of Maryland Grand Chapter
- Farmers Educational & Cooperative Union of America Montana Division
- Grand Lodge of Pennsylvania Sons and Daughters of Italy
- National Association of Watch and Clock Collectors Inc
- National Society of Tole & Decorative Painters Inc
- Royal Arch Masons in the State of Mississippi Grand Chapter
- Young Mens Institute Grand Council
- Grand Chapter of Conn OES Inc
- Grand Council Royal & Select Masters of Mississippi
- Professional Loadmaster Association
- Appa-Association of Higher Education Facilities Officers
- Associated Square Dancers
- National Society Colonial Daughters of the Seventeenth Century Inc
- Machinery Dealers National Association
- Naval Submarine League
- PTA Vermont Congress
- Royal Arch Masons of Maryland Grand Chapter
- Blet Auxiliary
- Grand Council of Cryptic Masons of Oregon
- Most Worshipful Prince Hall Grand Lodge Free & Accepted Masons
- Royal & Select Masters of Maryland
- Tennessee Society of Certified Public Accountants
- Wyoming Congress of Parent and Teachers Association
- Knights of Pythias Texas
- Urban League of Rochester Economic Development Corporation
- Corenet Global Inc
- International Association of Venue Managers Inc
- Knights of St John Supreme Ladies Auxiliary
- Bridge of Hope Inc
- National Society to Prevent Blindness
- American Cancer Society Inc
- Caring Incorporated
- Christians for Biblical Equality
- Grand Lodge of the Order of Hermanns Sons of the State of CA
- League of Women Voters of Kansas
- National Kidney Foundation Inc
- Order of the Eastern Star of District of Columbia Grand Chapter
- Palatines to America
- Richmond Quilters Guild
- Royal Arch Masons of Utah Most Excellent Grand Chapter
- Ibero-American Action League Inc
- Susan G Komen Breast Cancer Foundation
- Minnesota Society of Certified Public Accountants
- National American Glass Club
- Neighborhood Lending Partners Inc
- Universal Peace Federation USA Inc
- American Youth Hostels Inc
- Community Reinvestment Foundation Inc
- Frederick Douglas Community Development Corp
- National Organization of Industrial Trade Unions
- Women in Mining National
- Cancer Research Foundation
- No More Sidelines
- Society for the Preservation of New England Antiquities Inc
- Autism Speaks Inc
- International Association of Diecutting and Diemaking
- John Knox Manor Inc
- Keramos Fraternity
- La Leche League of the United States of America
- Shor Yoshuv
- United Way of Greater Rochester and the Finger Lakes Inc