Many DA readers own alternative investments (i.e., other than CDs). For those who own real estate investments, such as a condo or house rented to others, depreciation is factored in on Schedule "E". Even with a cash-flow positive property, depreciation will often shelter the income from tax.
Without getting into the nuts and bolts of IRS Form 8582 (where you can shelter ordinary income if your MAGI is below $150,000), a major wrinkle in the Tax Code allows you to avoid all depreciation recapture. Problem being, you must be dead.
While alive, if you sell a property where you have depreciation (whether taken or not), that depreciation is taxed at 25%. On the other hand, when you die, your heirs get a step-up in basis, the depreciation is wiped off the map, and the tax man gets stiffed.