Quote Quoting flyingron
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You are correct, I am sorry. In Pennsylvania, there must be a unity of interest in joint tenancy. That's not universal (for example Connecticut allows otherwise).

I didn't argue one house was a business, it was just a warning that if they were engaging in such a business that this would be income rather than capital gains (yes provided it's not held for longer as an investment/rental use). However, most people use "flipping" for shorter term than that.
I agree, but its not uncommon for a "flip" to take longer than a year, for one reason or another.