Depreciation is one of the biggest and most important deductions for rental real estate investors because it reduces taxable income but not cash flow. An investor can deduct the straight-line depreciation of a building over 27.5 years (plus bonus depreciation with cost segregation, certain assets can be depreciated over shorter periods). This means that a substantial amount of taxes is deferred until the sale of the property. In contrast, investments in equities, mutual funds, etc. do not provide any of these benefits.