The four chapters in this part discuss investment gains and losses, including how to figure your basis in property. A gain from selling or trading stocks, bonds, or other investment property may be taxed or it may be tax free, at least in part. A loss may or may not be deductible. These chapters also discuss gains from selling property you personally use — including the special rules for selling your home. Nonbusiness casualty and theft losses are discussed in chapter 25 in Part Five.