I have been meaning to do this for a while. Another post in the Robert's Rules board finally prompted me to do this.
Our PTO went through the process of becoming 501c3 with the IRS, and a Public Charity with the Commonwealth of Massachusetts. This past summer we completed our first reporting year and finished filing all our paperwork with the IRS and the state in November.
We were the first PTO in town to complete the process. The Mayor has reps from the PTOs and the school system meet once a quarter and I offered to make a presentation about our experience to that group.
Since then, a couple of the other PTOs have asked me to make the presentation to their groups, a third PTO has asked for help in filling out the IRS forms, and another one has successfully completed the process.
At the following link is the presentation that goes through - in some detail - the process to apply for recognition of non profit status (501c3) and what has to be done in MA to be a public charity. It also describes our timeline (and why it took longer than it could have) and some of the benefits we see in going down the path. (For example, we saved more in state sales tax than it cost us to pay a CPA to help us file the returns).
Even if you are not a MA PTO, I hope the information on the Federal filing is useful.
The URL is
www.macarthurschool.com/pto.htm
Once on the page, Click on the "Guide to getting Non-Profit/Tax-Exempt for a PTO" link. It is located on the right-hand side of the page, under the Babel Fish and above the PTO Calendar.
Our Charter (Articles of Organization to the IRS) is also located on that page, just above the Non-Profit presentation.