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Diagnostic Questions to Determine if Renter intends to pay
Assuming the renter was properly vetted, the only question worth asking is "what has changed in your life?" Perhaps one of the earners has lost a job, or has moved out because a couple has broken up. If nothing has changed but they just don't feel like paying you, start the eviction process. If something has changed and you assess that it's temporary (I lent my brother money and he didn't pay me back -  I'll be behind for a few months but I will catch up; my employer went out of business and didn't pay me for the last two weeks - I have a new job already and am waiting for my first paycheque) then perhaps you are willing to wait. If something has changed and it seems pretty permanent then you might reluctantly start the process. Depending on how long it takes where you live, the renter might get things under control before you finish.