Margie: Is an annual IEP based on the date it was signed or what’s indicated on the IEP?
IEPs: ANNUAL DATE BASIS
Special Education Law and Advocacy
https://www.wrightslaw.com/blog/iep-faqs-what-should-be-the-effective-date-on-ieps/
Check your state special education regulations for information about IEP dates. http://www.yellowpagesforkids.com/help/seas.htm