Guide · 1031 exchange vs cost segregation
One works while you own. The other works when you sell.
People ask which one they should do, as if it were a choice. It mostly isn’t. Cost segregation cuts the tax bill during ownership; a 1031 exchange defers the tax bill at the sale. Here is how each works, when you need which, and how they stack.
Updated October 2026. Not tax advice; bring it to your CPA.
In one line each
Cost segregation
An engineering study splits a building into parts that depreciate over 5, 15 and 27.5 or 39 years, so you deduct far more in the early years.
1031 exchange
Sell one investment property, buy another of equal or greater value within the deadlines, and the tax on the gain is deferred into the new one.
Side by side
Different jobs, different moments.
| Cost segregation | 1031 exchange | |
|---|---|---|
| What it does | Deducts more of the property's cost in the early years of ownership | Defers the tax on gain when you sell and buy another property |
| When it happens | Any year you own it; best in year one or as a look-back | At the sale, with strict 45- and 180-day deadlines |
| What you need | An engineering-based study and your CPA | A qualified intermediary, a replacement property, and your CPA |
| Who performs it | Realm, with Veritax Advisors' engineers | A qualified intermediary; we make the introduction |
| Cash effect | Lower tax this year; more cash to keep or reinvest | No tax bill now; the gain rolls into the next property |
| The catch | Depreciation is recaptured on sale (or deferred by a 1031) | Basis carries over, so the new property depreciates slowly unless you add money |
Which one, when
Four situations, four answers.
You're buying or you own, and you're not selling
There's nothing to exchange. The question is how fast you deduct what you already paid. A study, and 100% bonus depreciation if you acquired after January 19, 2025, answers it.
You're selling and buying something bigger
A 1031 defers the gain and the recapture into the replacement property. Then a cost segregation study on the replacement's new basis (the money you added) creates fresh year-one deductions. This is the flywheel.
You're selling and getting out of real estate
A 1031 only works if you buy again. Cost segregation on a property you're about to sell mostly creates recapture. The planning here is about timing the sale and, sometimes, installment structures. Talk to your CPA early.
You did a 1031 years ago and never did a study
The carried-over basis keeps its old schedule, but any basis you added at the exchange is yours to segregate. A look-back study catches up the missed depreciation on this year's return without amending old ones.
Together
Buy, segregate, hold, exchange, segregate again.
This is how long-term investors compound. Each purchase gets a study and a large early deduction. Each sale rolls into a bigger property without a tax bill. The new money in each trade-up gets its own study.
- [01]Buy a property. Cost segregation study. Large year-one deduction.
- [02]Hold. The deduction sheltered income; the cash funded the next down payment.
- [03]Sell through a 1031. Gain and recapture roll into the replacement.
- [04]Buy bigger. Cost segregation on the new basis. Another large deduction.
- [05]Repeat. On the final property, the deferred gain can disappear at the step-up in basis.
Questions
If I do cost segregation now, does it hurt a 1031 later?
Usually not, and often it helps because the cash you kept funded the next purchase. The one thing to plan for: the study creates 5- and 15-year personal property, and if the replacement property has much less of it, some recapture can be triggered at the exchange. Your CPA checks this before you identify the replacement. It's a known issue with a known answer, not a reason to skip the study.
Can I cost-segregate a property I received in a 1031?
Yes, on the new money. The basis that carried over from the old property keeps depreciating on its old schedule. Anything you paid above that, the 'excess basis,' is new and can be segregated like any purchase. On a trade-up this can still be a large number.
Which saves more tax?
They answer different questions, so 'more' isn't the comparison. Cost segregation moves tax from the future to now, while you own. A 1031 pushes tax from now to the future, when you sell. Investors who hold long-term and keep trading up use both, repeatedly, and some never pay the deferred gain at all because of the step-up in basis at death.
Does Realm do 1031 exchanges?
No. A 1031 needs a qualified intermediary and tax counsel, and we keep a short list of both. We handle the cost segregation side and the planning conversation that decides which tools fit your situation.
What about a Delaware Statutory Trust?
A DST is a way to complete a 1031 into a passive, professionally managed property interest instead of a building you run. It's a real option for someone exiting active ownership. It's a securities product, so it comes from a licensed advisor; we can point you to one.
Related: 100% bonus depreciation, how cost segregation works, the high-income guide.
Own it or selling it, start with the numbers.
A free estimate shows what a study would do for a property you own or are buying. If you’re selling, the advisor call maps the exchange and the study together.