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Too bad I'm not still in business; I had a bunch of these all outlined. I did quite a bit of these, mostly 1/2 hour.............
One piece of advice; have more material than you need;
let me think
I'll mull it over
I use to give a talk every year to other CPAs about current tax case decisions; I'd pick out a half dozen or so interesting cases, ones with nothing to difficult to understand & just go over the facts & ask them how they think it was decided;
One of ways to get a great talk going is to engage the audience; this does that because you get them involved in figuring out how the Court ruled; you can do it with almost any audience; you just have to think of the audience when you pick the cases;
One other point:
Pick a topic that you like to talk about; your knowledge will come through by the fact that you are comfortable with the topic
You can always talk about personal income taxes; that's your best bet because everyone has that issue
You know about Quickbooks; pick a topic within that & explain how it can help make sure you get all your tax deductions;
Print out a copy of the first tax return; I think it is 1 or 2 pages; copy them & pass them out to everyone & go over it & as how could we have evolved from that to where we are now; the 10 minutes will go so fast you'll need 20 minutes.......................................