Straight-Line Depreciation (Tax)

Straight-line depreciation is a tax method that allocates the depreciable basis of qualifying commercial property evenly over its IRS-prescribed recovery period. For many CRE assets, especially the building itself, straight-line produces constant annual deductions that simplify forecasting of taxable income and cash flow. In lending and acquisition models, using straight-line yields stable, predictable depreciation expense which affects net operating income after taxes and influences long-term debt coverage projections. It contrasts with accelerated methods that concentrate deductions earlier in an asset’s life.

Underwriters and sponsors use straight-line depreciation when modeling long-term cash flow stability, refinance scenarios, and investor return projections for assets with building-level recovery periods. Because straight-line gives consistent annual tax deductions, it aids in creating conservative pro forma that do not overstate early-year after-tax cash flow. Lenders may prefer models that distinguish between straight-line treatment of core building components and accelerated treatment of shorter-lived assets, ensuring accurate DSCR, loan sizing, and expectation management for tax-related cash flow variability over the loan term.

Straight-line depreciation matters because it creates predictable tax expense and after-tax cash flow patterns that affect loan underwriting, borrower distributions, and yield calculations. For long-term investors and fixed-rate lending structures, predictability reduces the risk of unexpected drops in debt service capacity due to shifting tax deductions. Knowing which CRE components must use straight-line versus accelerated methods supports realistic debt service models and exit planning, and helps align sponsor expectations with lender covenants and investor return targets across the holding period.