At age 18 he is an adult for almost all purposes, and you have no duty to provide support for him. (This may be different if he has not completed high school and is a full time high school student). I suggest putting the ultimatum in writing and go over in some detail the reasons behind it (i.e. the unwillingness to work, the failure to pay rent). If you are willing to help with deposits for utilities, etc., indicate that also.
You may wish to contact the local police precinct about how they suggest best going about this to avoid having to call them out to the scene. If it does come down to having to "boot" your son, give the police a heads up call. They may not want to get involved since it is a civil matter, but it can prevent them from showing up without knowing what is going on.
You can get in contact with a locksmith in advance too about being present to change the locks to your house at a time when your son will not be present if you decide to put him out.
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Are you confident tthat this is acceptable in Florida as I know there are some strange laws here? Yes, he is a high school graduate. I do not have the resources to help him financially which is why I have asked him to pay to live here.
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