Just to clarify: It is not the fact that it was rented first. ANYTIME that you move into a home after it was rented would create Nonqualified Use. So even if you had originally used it as your residence, then rented it out, then used it as your residence again, there would be Nonqualified Used and the exclusion would be prorated.
If you rent it out again and then move back into it, you will be adding more Nonqualified Use.
