I remember trying to explain the dealer versus investor concept to a would-be real estate entrepreneur. I asked him whether he was holding the property for sale. He kind of looked at me and smiled and said “Everything is for sale. It just depends on how much.”. If there is any ambiguity it is easy to know what the answer is after the fact. If there was a big gain relative to expenses then you were an investor. If there was a loss, then you were a dealer. Unfortunately, you really are not supposed to practice that way. I am going to assume that you want investor status and that you are blessed with a gain. What can you do to make sure the IRS respects your investor status?

How Should a Disregarded Single Member LLC File a W-9?
Although Form W-9 has some other purposes, a company will usually ask you to fill it out if you are a business-to-business service provider . If you don’t provide a TIN to your customer, they may have to subject you to backup withholding . If it is my company that asks you for the W-9, I am not going to do backup withholding if you don’t send me the W-9. I’m just not going to pay you until you cough it up.
I believe in learning from experience. But it is better if the experience you learn from is other people’s experience. That is why a very large percentage of my tax writing is from court opinions, most often the United States Tax Court. This piece is my own experience.