Conventional loans backed by Fannie Mae and Freddie Mac are generally not assumable, though exceptions may be allowed for adjustable-rate mortgages.
While the Internal Revenue Service has the right to take possession of your assets (including your home) through a tax levy, they'll do it as a last resort. They're more likely to explore a less damaging collection option, and only then will they consider taking your home.
In many ways, Florida state law favors the homeowner over the mortgage lender. One of the principle examples of this is the fact that the law requires the lender to carry out a judicial foreclosure. What this means to you is that the bank cannot simply foreclose on the property and evict you from your home.