A cost segregation study is an engineering-based analysis that breaks your property into its components and moves the ones that qualify into shorter-life categories, so you can depreciate them faster than the 27.5 or 39 years the IRS assigns the building.
As of 2026, with 100% bonus depreciation back for property acquired and placed in service after January 19, 2025, those components can often be written off in year one.
It’s the question I get asked most on the BiggerPockets forums, so here’s exactly how the process works.
The Cost Segregation Process in 5 Steps
Here’s what actually happens between the day you order a cost segregation study and the day the deduction hits your return.
Step 1: Property Review and Documents
Everything starts with a detailed look at the property. Whether it’s a new purchase, recent renovations, or even ongoing improvements, a cost segregation study needs all the data—purchase prices, blueprints, and construction costs. Think of this as the foundation.
Step 2: Engineering Analysis
This is where the experts come in. Engineers and tax specialists evaluate every component of your property to find assets that can be depreciated faster than the standard 27.5 or 39-year schedule. Items like carpeting, lighting, or landscaping—often overlooked—qualify for faster write-offs.
Step 3: Asset Classification Into 5-, 7-, and 15-Year Property
The engineer then sorts those components into shorter recovery periods, often 5-, 7-, or 15-year property depending on the asset and the industry. In a typical rental, that means things like carpet, appliances, cabinetry, and decorative lighting in the 5-year bucket, and parking lots, sidewalks, fencing, and landscaping in the 15-year bucket.
What doesn’t move is the parts that make the building work as a building, like the roof, the main HVAC system, plumbing, and general wiring. Those stay on the 27.5- or 39-year schedule. The line between the two is where most of the value sits, and most of the audit risk, which is why you want an engineer putting it together.
Step 4: The Study Report and Depreciation Schedule
Once the analysis is complete, a detailed report outlines all the assets that have been reclassified. This report breaks down the amount of depreciation you can claim in those early years—significantly boosting your cash flow by lowering your taxable income.
Step 5: Claiming the Depreciation (Form 4562 or Form 3115)
Your CPA puts the new schedule on your return. For a property you placed in service this year, it goes on Form 4562 with the rest of your depreciation, including any bonus depreciation. For a property you’ve owned for a while, your CPA files Form 3115 and takes all the depreciation you missed as one catch-up deduction this year. No amended returns.
We offer two ways to perform cost segregation studies:
- Condensed Detailed Engineering Cost Segregation Study
- Detailed Engineering Cost Segregation Study
- Estimate your potential tax savings instantly using the Maven Cost Segregation Calculator
Which Income Your Depreciation Can Offset
Cost segregation doesn’t just help you reduce taxes in the short term; it can offset different types of income. Here’s how depreciation can work in your favor:
- Nonpassive Income (W2 income, salaries): While depreciation typically can’t offset nonpassive income, it can if you qualify as a real estate professional.
- Passive Income (rental income, passive investments): This is where cost segregation shines. Accelerated depreciation offsets passive income, lowering the taxable amount or potentially eliminating taxes on rental income altogether.
- Portfolio Income (dividends, interest): Unfortunately, depreciation won’t offset portfolio income, as it’s categorized separately from real estate income by the IRS.
- Capital Gains (profits from property sales): Depreciation can indirectly impact capital gains taxes by lowering the cost basis of your property, but the real advantage is taking those deductions early and reinvesting the cash into other opportunities.
Cost segregation is about maximizing your tax savings upfront. By accelerating depreciation, you reduce taxable income faster, meaning more money stays in your pocket when it matters most—early in your investment’s lifecycle. Whether you’re a seasoned investor or just starting, this is a strategy worth discussing with your tax advisor.
If you’ve already completed a property purchase or renovation and haven’t yet considered a cost segregation study, now might be the time. Reach out to our team at Maven Cost Segregation, and let's explore how this strategy could fit into your real estate investment plan.