I'm not sure I agree with @AmyC .
Based on the limited facts, you indicate that you started an LLC to flip houses. This to me indicates that this is a trade or business; a dealer in real estate.
If that in fact is the case, your houses do not qualify as a capital asset and in fact become inventory.
That means, upon sale, the house will generate ordinary income regardless of how long you held it.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
