Cost Segregation & 100% Bonus Depreciation: What the OBBBA Means for Property Owners (2026)

For years, real estate investors planned around a ticking clock. Bonus depreciation — the ability to write off certain assets immediately instead of over decades — was scheduled to phase down: 80%, then 60%, then 40%, dropping toward 20% by 2026 and disappearing entirely soon after. Every article told you to "act fast before it's gone."

That clock is gone. Bonus depreciation is now permanent.

What changed

The One Big Beautiful Bill Act (OBBBA) restored and made 100% bonus depreciation permanent. If you've been operating on the old "phasing down to 20%" assumption, throw it out. That narrative is stale.

Here's what "permanent 100% bonus" actually means: any asset with a recovery period of 20 years or less can generally be fully deducted in the first year it's placed in service. And it's not a limited-time window anymore — it's the standing rule.

Why this makes cost segregation *more* valuable, not less

You might think, "If bonus is permanent, what's the rush?" The rush is this: the biggest deductions only exist if you find the short-life assets in the first place — and cost segregation is how you find them.

When you buy a building, the IRS defaults you into depreciating the whole thing over 27.5 years (residential rental) or 39 years (commercial). Straight-line. Slow. A cost segregation study breaks that building apart and identifies the components that legitimately belong in 5-, 7-, and 15-year schedules — carpeting, cabinetry, specialty electrical and plumbing, site improvements, landscaping, parking lots, and more. Typically 20–35% of the building's basis qualifies.

Every one of those reclassified assets has a recovery period of 20 years or less — which means 100% bonus depreciation applies to them. No study, no reclassification, no bonus. You'd just keep grinding out that 39-year straight-line deduction and leaving money on the table every single year.

A concrete example

Imagine a $1,500,000 apartment building (excluding land).

• Without a study: ~$54,500/year in depreciation over 27.5 years.
• With a study: Say 30% — $450,000 — reclassifies into short-life assets. Under permanent 100% bonus depreciation, much of that $450,000 can be deducted in year one.

In a 37% combined bracket, accelerating ~$450,000 of deductions can defer well over $150,000 in taxes into the present — cash you can redeploy into your next deal. The study to unlock it? $2,100 flat.

"Money left on the table" — literally every year

Here's the mental model we want every owner to have: every year you depreciate a property over 27.5 or 39 years instead of accelerating it, you are handing the IRS an interest-free loan. Bonus depreciation being permanent doesn't reduce the urgency — it removes your excuse to wait for a deadline. The deadline is gone; the opportunity is standing there every year you own the property.

And if you've owned a property for years without a study? You're not too late. A Form 3115 (Change in Accounting Method) lets you catch up all the depreciation you should have claimed — often as a single large deduction in the current year — without amending old returns.

Why the study has to be done right

Bigger, faster deductions naturally attract more attention. That's why methodology matters. Every National Cost Segregation LLC study includes a live, on-site inspection by a licensed appraiser — our founder Mike Baldwin is a Certified General Appraiser licensed in 11 states, an MAI candidate, and a licensed real estate broker. When deductions are backed by real, documented, first-hand evidence rather than a software estimate, they stand up to scrutiny.

The bottom line for 2026

• 100% bonus depreciation is permanent under OBBBA.
• Cost segregation is what makes those big first-year deductions possible.
• Waiting only costs you — every year over 27.5 or 39 years is money left behind.
• A defensible, appraiser-inspected study costs $2,100 flat.

Ready to stop leaving money on the table? Book a free consultation or call (860) 631-3310.

Disclaimer: This article is for general informational purposes only and does not constitute tax, legal, or accounting advice. Tax law is complex and individual situations vary. Consult your own qualified tax advisor before acting on any information here. Illustrative figures are examples only.