We changed our name last year, I believe we just had to file paperwork with the state (we're in Michigan), and included a copy with our IRS filing. So now we're ABC PTO "doing business as" XYZ PTO. We kept the same bank account, EIN number, etc, just changed the name. I have no idea if this is consistent across different states, though. If you'd like more details I can look up the paperwork... I didn't fill it out but I do have copies on file at the school.
Recently we made a couple of minor ammendments to our PTO's by-laws. We also voted to change the name of our group to exclude the word "elementary", since our school name changed was Blankety Blank Elementary School, now it is Blankety Blank School (school went K-8). We voted to change the name of our organization to Blankety Blank School PTO. I know that we are required to send the IRS a copy of the ammended by-laws. Does anyone know what impact, if any, changing our name will have?