What Is MACRS?
MACRS is the rulebook for depreciating rental real estate. Residential rental gets 27.5 years; commercial gets 39. Land improvements (parking lots, fencing) get 15 years. Personal property — appliances, carpet, fixtures — gets 5 or 7 years. Cost segregation studies reclassify portions of the building (e.g., HVAC, flooring, cabinets) from 27.5-year real property into 5- or 7-year personal property, accelerating deductions. The "accelerated" part comes from the declining-balance method used for shorter-life assets, plus bonus depreciation when available. Example: a $300,000 property might have $65,000 reclassified into 5-7 year assets via cost seg — that $65,000 gets deducted much faster than over 27.5 years.
MACRS (Modified Accelerated Cost Recovery System) is the IRS depreciation system for all rental property — it defines recovery periods (27.5 years for residential, 39 for commercial), conventions (half-year, mid-month), and how cost segregation reclassifies components into shorter lives to accelerate deductions.
At a Glance
- What it is: The IRS depreciation system for all rental and business property
- Why it matters: Defines how fast you can deduct the cost of buildings and components
- Residential rental: 27.5-year recovery, mid-month convention
- Commercial: 39-year recovery
- Cost seg reclassification: Moves 20–40% of basis into 5-, 7-, or 15-year assets for faster deductions
How It Works
Recovery periods. MACRS assigns every asset a recovery period. Residential rental: 27.5 years. Commercial: 39 years. Land improvements (sidewalks, landscaping, parking): 15 years. Personal property (appliances, carpet, furniture, some fixtures): 5 or 7 years. The shorter the period, the faster you deduct.
Conventions. MACRS uses conventions to determine how much depreciation you get in the first and last years. For real property (buildings): mid-month convention — you get a half-month for the month you place the property in service. For personal property: half-year convention — you get half a year in the first year, regardless of when you placed it in service.
Cost segregation. A cost seg study breaks the building into components. The structure (framing, foundation, roof) stays at 27.5 years. But carpet, appliances, cabinets, lighting, and certain mechanical/electrical can be reclassified into 5- or 7-year property. A typical study might find 25–35% of the basis in shorter-life assets. Those get depreciated on an accelerated schedule — and when bonus depreciation is available, you can deduct a large chunk in year one.
Bonus depreciation. Congress periodically allows "bonus" first-year depreciation — e.g., 80% or 100% of the cost of certain assets in year one. It applies to personal property and land improvements, not the 27.5-year building. Cost seg increases the amount of basis in bonus-eligible assets, so you get a bigger year-one pop.
Real-World Example
Rachel: $300,000 fourplex in Atlanta.
Rachel bought a $300,000 fourplex. Without cost seg, she'd use straight-line depreciation on the building over 27.5 years — about $9,500/year (assuming 20% land). She paid $2,500 for a cost seg study.
The study reclassified $65,000 into 5- and 7-year property: appliances ($12,000), carpet ($18,000), cabinets and counters ($14,000), lighting ($8,000), and other components ($13,000). The remaining $235,000 (after $65K reclassified from the $300K total basis) stayed in the 27.5-year bucket.
With 80% bonus depreciation (2023 rules), she deducted 80% of the $65,000 ($52,000) in year one, plus the regular MACRS schedule on the remainder. She also took straight-line depreciation on the $235,000 building portion. Total year-one depreciation: roughly $60,000. Without cost seg, it would have been about $9,500. The study paid for itself many times over in tax savings.
Pros & Cons
- Cost segregation accelerates deductions — often 5–10x more in the first few years
- Bonus depreciation can make a large chunk of reclassified assets deductible in year one
- Legal and well-established — the IRS accepts properly prepared cost seg studies
- Especially valuable for value-add or renovation deals where you have significant personal property
- Depreciation recapture at sale — you'll pay 25% on the amount recaptured
- Cost seg studies cost $2,000–$5,000+; only worth it on properties with enough basis
- Overly aggressive studies can invite audit — use a reputable provider
Watch Out
- Study quality: Use an engineer-based cost seg firm, not a generic tax preparer. The IRS has challenged studies that lack proper support. Look for a provider with a track record and defensible methodology.
- Basis threshold: Cost seg usually makes sense on properties with $200K+ in depreciable basis. Below that, the study cost may not justify the benefit.
- Exit planning: Depreciation recapture applies to all depreciation taken — including accelerated amounts. Plan for the tax at sale, or consider a 1031 exchange to defer.
Ask an Investor
The Takeaway
MACRS is the framework; cost segregation is the lever. For properties with meaningful basis ($200K+), a cost seg study can reclassify 20–40% into 5–7 year assets and dramatically accelerate deductions. Combine that with bonus depreciation when available, and you can front-load tens of thousands in year-one deductions. Work with a qualified provider and plan for depreciation recapture at exit.