
Nacha's September 2026 ACH Rules: New IAT Definition and 9 A.M. Funds Availability
On September 18, 2026, Nacha makes standard ACH credits available by 9 a.m. with no receipt cutoff and rewrites the IAT definition in Section 8.55. What changes for cross-border payments, payroll timing, and the 2027–2028 follow-ons.










