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The One Depreciation Setting Quietly Costing Real Estate Investors Tens of Thousands a Year
Nischay Rawal, CPA, EA
6 min read
Two investors buy the same building. Same purchase price — a million dollars. Same kind of property, same year, same market. On paper, identical.
But when tax season comes, one of them keeps tens of thousands of dollars more than the other.
Not because of a risky loophole. Not because one got a better deal or a smarter agent. The only difference is a single decision each of their accountants made — or, more often, never thought to bring up.
It comes down to one quiet setting in how a property is depreciated. And if you own rental real estate, there's a real chance that setting is costing you money right now. Here's how it works, and how to find out whether it's happening to you.
The “default setting” almost nobody questions
When you buy an investment property, the IRS lets you deduct the cost of the building over time. That's depreciation — one of the biggest tax advantages real estate has. The catch is how most accountants apply it.
By default, they depreciate the entire building on a straight line over a single long schedule. Under IRS rules, that's 27.5 years for residential rental property and 39 years for commercial property (Publication 946; Publication 527). The whole structure, treated as one block, deducted in equal slivers, decade after decade.
So a $1,000,000 building might hand you somewhere around $25,000 of depreciation in a given year. (Illustrative — your number depends on the property.) A steady trickle — while you pay the IRS full freight today. Here's the part that surprises people: those deductions aren't missing. They're just stuck in slow motion. There's a legal, IRS-recognized way to change that timing. Most investors have just never had anyone walk them through it.
What cost segregation actually is (in plain English)
For tax purposes, a building isn't really one single thing. It's made of components — flooring, cabinetry, light fixtures, certain specialized electrical and plumbing, landscaping, fencing, paving. And under the tax code, many of those don't have to ride the building's long schedule. They legally qualify for much shorter ones: 5, 7, or 15 years. A cost segregation study is an engineering-based analysis that identifies which parts qualify, and reclassifies them.
Why this matters more in 2025
For years, “bonus depreciation” — the rule that lets you deduct the full cost of short-life property in year one — was phasing out, down to 40% for 2025 and headed to zero. Then the One Big Beautiful Bill Act (signed July 4, 2025) permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025. The IRS confirmed it in Notice 2026-11.
The short-life components a study reclassifies — the 5-, 7-, and 15-year property above — are exactly the kind that qualify for that 100% bonus. (The building shell does not.) So the slice a study moves onto short schedules can now be deducted in full, in year one.
What could this be worth on your property?
Our free calculator gives you an illustrative first-year deduction and tax-savings range for your property — property type, purchase price, and tax bracket, in under a minute.
Our free calculator gives you an illustrative first-year deduction and tax-savings range for your property — property type, purchase price, and tax bracket, in under a minute.
“Wait — is this actually legal?”
Yes. Cost segregation isn't a loophole — it's a recognized method of depreciation, and the IRS publishes its own Cost Segregation Audit Techniques Guide (Publication 5653) telling examiners how to review these studies. Agencies don't write detailed audit manuals for things that aren't an established part of the code. What makes a study sound is how it's done: engineering-based and documented, so the position stands on its own.
“Wouldn’t my accountant have done this?”
Often not — and it's usually not a knock on them. Most firms are built for compliance: filing accurately and on time. Proactive strategy like an engineering-based study is a different discipline, and many excellent CPAs don't run them in-house. If it's never come up, it usually just means that question was never asked.
Is it worth it for your property?
Not always — and anyone who says otherwise is selling. It depends on the property's size and type, the timing, and the one question most people skip: can you actually use a large deduction this year? That hinges on your participation status and income picture. The only way to know your real number is to run your actual property.
Here's our actual promise: if we run your numbers and a study isn't clearly worth more than it costs, we'll tell you that on the call. No pressure. We'd rather earn your trust than push a study you don't need.
Get your free Cost Segregation Savings Estimate
A few questions, a short call, and a real dollar figure for what a study could be worth on your property — before you commit to anything.
- IRS — Treasury, IRS issue guidance on the additional first year depreciation deduction (Notice 2026-11) — irs.gov
- IRS — Cost Segregation Audit Techniques Guide (Publication 5653) — irs.gov/pub/irs-pdf/p5653.pdf
- IRS — Publication 946, How To Depreciate Property — irs.gov/publications/p946
- IRS — Publication 527, Residential Rental Property — irs.gov/publications/p527
