W2 job and flipping homes and taxes

[Vladimir K.]

This is a hypotethical question for me that I did not see answered.  As I understand it, buying a property with intent to flip it quickly, for a profit, makes one a 'dealer' in the eyes of the IRS.  

Dealer is someone who makes a living off buying properties, and must, therefore, pay an additional self-employment tax (if I understand this correctly). However, what if a person has a full time job and is not earning a living by being self-employed? Would they need to pay this additional dealer/self-employed tax? I understand that the solution is to create an LLC (or S Corp, etc...) and flip using that entity, however, will this hold true for just 1 or 2 flips a year?