What you might be thinking of is that up until 1997 there was a tax provision that you could postpone (but not eliminate) the gain from selling your primary residence if you used the money from the sale to buy a new primary residence within a certain period of time. That provision was removed from the tax law 26 years ago, in 1997. It was replaced by the exclusion of gain that Bsch4477 referred to. Since 1997 the exclusion of gain is the only tax break for selling your primary residence. As I have said, the exclusion of gain has nothing to do with what you do with the money from the sale, where you move to, or what other homes you own.
