Cost Segregation: Get Your Building’s Tax Deductions Now, Not Over 39 Years

If you own the building your business operates in — or any commercial or rental property — the IRS is probably making you wait decades for tax deductions you could be taking right now.

A cost segregation study fixes that. For many property owners, it means a six-figure deduction in a single year instead of the same money dribbling out over 39 years. Here’s how it works, without the accountant-speak.

The Problem: The IRS Treats Your Whole Building Like One Thing

When you buy or build a commercial property, standard tax rules say you deduct its cost a little at a time over 39 years (27.5 for residential rentals). Buy a $1 million building, and you’re deducting roughly $25,000 a year for four decades. Slow.

But think about what a building actually is. It’s not one thing — it’s hundreds of things. Carpet and flooring. Cabinets and counters. Special electrical for your equipment. Plumbing for that wash bay. The parking lot, the fencing, the landscaping, the signage. The IRS agrees that many of those parts wear out much faster than the walls and the foundation — and the tax code lets you deduct faster-wearing parts over 5, 7, or 15 years instead of 39.

The catch: you can’t just claim that on your own. You need an engineering-based report that walks the property, itemizes it, and puts every component in the right bucket. That report is a cost segregation study.

The Big Multiplier: 100% Bonus Depreciation Is Back — Permanently

Here’s what makes this the best time in years to do a study. Under the tax law passed in 2025, 100% bonus depreciation is permanent for qualifying property placed in service after January 19, 2025.

In plain terms: every component the study assigns to a 5, 7, or 15-year bucket doesn’t just depreciate faster — it can generally be written off entirely in year one.

Say a study finds that 25% of your $1 million building qualifies. That’s roughly a $250,000 deduction this year instead of waiting decades for it. The tax savings on that can easily rival what many owners put down on the building in the first place.

Who This Is For

You don’t need a skyscraper. Cost segregation regularly pays off for:

• Auto shops, truck yards, and service garages — bays, lifts’ electrical, compressed air lines, yard paving
• Restaurants and bars — kitchen buildouts, millwork, specialty plumbing and ventilation
• Warehouses and shops — racking-related work, dock equipment, yard improvements, fencing
• Medical, dental, and vet offices — plumbing and electrical built into every operatory
• Rental property owners — single-family rentals, apartments, and short-term rentals (27.5-year property has plenty of 5- and 15-year parts too)
• Self-storage, retail, offices, hotels — you name it

As a rule of thumb, if you’ve bought, built, or significantly renovated a property for $500,000 or more, a study is worth pricing out. Bigger properties, bigger payoff — and if you bought the property in a past year, a “catch-up” study can often capture the missed deductions all at once on your next return, without amending old ones.

What It Looks Like, Step by Step

1. Free estimate first. Share basics about the property — purchase price, year acquired, property type. The specialists run a no-cost projection of your likely deduction, so you see the numbers before spending a dime.
2. The study. Engineering and tax pros in our network review your closing documents, construction costs, and the property itself, then produce the IRS-ready report itemizing every component into its proper category.
3. Your CPA files it. The report plugs into your tax return, and the deductions land. For past purchases, the catch-up deduction typically arrives in the current year’s filing.

Frequently Asked, Quickly Answered

Is this some kind of loophole? No — it’s how the depreciation rules are meant to work. Cost segregation is a well-established practice, and the IRS publishes its own audit guide describing how proper studies should be done. The study exists to document everything correctly.

Does it make sense if I might sell the building soon? Selling can claw back some of the benefit, so holding for a while usually makes the math better. That’s exactly the kind of thing the free estimate sorts out before you commit.

What does a study cost? It depends on the property, but the deduction is typically many times the fee — and you’ll know both numbers up front from the free estimate. If it doesn’t clearly pay for itself, we’ll tell you to skip it.

This page is general information, not tax advice. Studies are performed by qualified engineering and tax professionals, and your CPA applies the results to your specific return.

Find Out What’s Hiding in Your Building

Most owners are shocked the first time they see the number. Get your free estimate — apply now or reach out, and we’ll have the specialists run your property. A few minutes to start, no obligation, and applying does not impact your credit.