When tenants don't pay the final month rent

[Daniel K.]

How do you handle a tenant not paying the last month of rent?  I am sure many tenants think nothing of this and assume the security deposit covers it despite the lease saying it is not for covering rent.  

There's no way of knowing if they intend to become squatters so due diligence requires serving a notice to quit and following up with eviction to avoid prolonged vacancy.  But is this what most of you actually do, and does it happen often?

I think I might be dealing with this now.  But going forward, to avoid this I think I will remind tenants with a canned message near the end of their term that the security deposit does not cover rent, and pay or quit notice/eviction will begin when last month's rent is overdue.