Answer:
There actually are rules to fundraising--federal laws and tax laws. How much, what it can do, how its used, who gives it, etc. are all defined.
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There aren't necessarily any rules to fundraising. But if you raise more than a certain amount you will need to report it on your taxes unless you are a registered non profit organization. And if you are doing school fundraisers you may need to check with the school board to make sure your program is approved.