Taxes & Entities

Cost Segregation

Cost segregation breaks a building into its real components and reclassifies the short-life parts for far faster depreciation, accelerating deductions on real estate. Its deeper lesson is decomposition: treating something as one monolithic lump hides that it's really many different things, and breaking it apart unlocks value the aggregate concealed.

  • Advanced
  • 10 min total
  • 12 chapters

What decision this helps you make: Whether to decompose a building for faster depreciation, and, more broadly, where treating something as a single lump is hiding value that breaking it into its true components would reveal.

What this topic is

An engineering-based study that breaks a building into components and reclassifies the short-life parts (fixtures, finishes, site improvements) for much faster depreciation than the whole building.

Why it matters

It accelerates real-estate deductions substantially, and it teaches that decomposition unlocks value that treating something as one monolithic unit hides.

Who should learn it

Real-estate owners and investors, and anyone learning to find value by breaking a monolithic thing into its truly different components.

What you will understand

  • A building is depreciated as one long-life asset by default
  • But it's really many components with different, shorter lives
  • Cost segregation reclassifies them to accelerate deductions
  • Decomposition unlocks value that aggregation hides

Prerequisites

Common misconception

"A building is one asset, so it depreciates as one thing over one long life." A building is really an aggregation of many different components (structure, fixtures, finishes, site improvements) with very different true depreciation lives. Treating it as one monolithic asset hides that a large fraction of it qualifies for far faster deductions. The aggregation conceals the value.