Cost Segregation for Partnership Buyouts: 2026 Verdict
Buying out a partner in a residential rental LLC changes more than the cap table. It resets part of the depreciable basis, and a cost segregation study is the tool that decides whether that reset basis rides the standard 27.5-year schedule or gets pulled into 5, 7, and 15-year property starting the year the buyout closes.
- A Section 754 election on the buyout lets the stepped-up share get cost segregated into 5 and 15-year property - Buy this route.
- No 754 election means the step-up sits in outside basis only, so cost segregation applies to the original basis alone - Consider.
- Bonus depreciation runs at 100% in 2026 under the OBBBA, so the buyout's placed-in-service date matters more than usual.
- A flat $2,200 fee doesn't change based on how many partners are on the K-1, unlike percentage-fee competitors.
Why this matters
A partnership buyout is a basis event, not just a signature on a purchase agreement. If the LLC has a Section 754 election in place, the buying partner's share of inside basis steps up to reflect what they actually paid for the departing partner's interest, and that stepped-up amount is exactly what a study on properties held in an LLC can reallocate into shorter-lived property.
Skip the 754 election, and the step-up lives in outside basis only. Cost segregation still applies to the property's original depreciable basis, but the new money the buying partner put in doesn't get the same acceleration. That distinction is the single biggest variable in whether a buyout-triggered study is worth ordering in 2026.
Who this is for
This guide is for partners in an LLC or partnership that owns a residential rental or short-term rental, someone buying out a co-owner (or being bought out), and their CPA trying to figure out what happens to depreciation on both sides of the transaction. It applies to two-person LLCs holding a single Airbnb, three-partner groups splitting a duplex, and larger investor groups where one member is exiting.
What to look for in a study for a partnership buyout
Whether a Section 754 election is filed
The 754 election is what unlocks a basis step-up for the buying partner specifically, rather than for the partnership as a whole. Without it filed with the partnership return for the year of the buyout, there's no special basis adjustment to segregate, and the study should be scoped around the property's existing basis instead.
Timing against the placed-in-service date
Cost segregation follows the tax year the buyout closes, not the year the property was originally purchased. A buyout that closes in November 2026 still gets a full 2026 placed-in-service treatment on the stepped-up share, which matters when bonus depreciation is running at 100% under the OBBBA.
How the study splits basis between partners
A study built for a buyout has to separate the continuing partners' original basis from the bought-out partner's stepped-up share, since each layer depreciates on its own schedule. A generic study that lumps everything into one basis figure will misstate depreciation for at least one partner's K-1.
Capital account and partnership agreement records
The engineer preparing the study needs the closing statement from the buyout, the partnership agreement's basis adjustment language, and updated capital account balances. Missing these documents is the most common reason a buyout-triggered study gets delayed past the 3 to 5 business day turnaround most flat-fee providers advertise.
Audit defensibility across ownership transitions
An examiner reviewing a partnership return with a recent buyout will look at whether the basis step-up was documented and whether the cost segregation report ties back to the actual purchase price paid for the departing interest. A 100+ page engineering-based report with photos, cost detail, and IRS Audit Technique Guide methodology holds up here better than a rule-of-thumb allocation.
Flat-fee pricing that doesn't punish multi-partner deals
Some providers price by property value and partner count, which penalizes exactly the deals where a study matters most. A flat $2,200 fee removes that incentive to skip the analysis on smaller buyout allocations.
Top picks for buyout scenarios
The clean case. Buyout closes with a 754 election filed the same year, full purchase agreement in hand, property already generating rental income. The stepped-up basis segregates cleanly into 5 and 15-year property, often reclassifying 20 to 45% of the adjusted basis. Buy.
The no-election case. Partners agree on a buyout price but never file the 754 election. Cost segregation still applies to the property's original basis, just not to the new step-up. Still worth ordering if no prior study exists on the property. Consider.
The partial-year retirement case. The departing partner's exit also retires specific assets, like a hot tub or deck the buying partner plans to replace. A partial asset disposition study lets the remaining partners write off the undepreciated basis of what's being torn out, on top of the buyout-triggered segregation. Buy.
The retroactive catch-up case. The property was purchased in 2019, no cost segregation was ever done, and the buyout is the first time anyone looks closely at depreciation. This can trigger a Form 3115 accounting method change to catch up missed depreciation in a single year, layered on top of the buyout's step-up analysis. Buy, but budget extra CPA time for the 3115 filing.
The mid-dispute case. Buyout price and basis allocation are still being litigated or negotiated between partners. Ordering a study before the numbers are final means redoing the allocation once the purchase price settles. Wait.
What to avoid
- Percentage-fee firms that reprice for multi-partner deals. A study on a $600,000 duplex shouldn't cost more because three names are on the LLC operating agreement instead of one.
- DIY calculators for basis-split scenarios. A free online estimator gives one number for the whole property. It can't separate a bought-out partner's stepped-up share from the continuing partners' original basis, which is the entire point of a buyout study.
- Ordering before the closing statement is final. The study needs the actual price paid for the departing partner's interest. An estimate based on a verbal agreement gets revised, sometimes at extra cost.
“If the 754 election isn't filed with the partnership's return for the buyout year, the step-up never reaches the cost segregation study.”
Verdict comparison
| Scenario | 754 election filed | Basis affected | Verdict |
|---|---|---|---|
| Clean buyout, same-year closing | Yes | Full step-up on bought-out share | Buy |
| Buyout without 754 election | No | Original basis only, no step-up | Consider |
| Buyout with asset retirement | Yes | Step-up plus disposed asset basis | Buy |
| First study, property owned 5+ years | Optional | Retroactive catch-up via Form 3115 | Buy |
| Buyout still in dispute | N/A | Purchase price not finalized | Wait |
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FAQ
What is a cost segregation study for a partnership buyout property?
It's an engineering-based analysis that separates a residential rental's building components into 5, 7, 15, and 27.5-year property, applied to the basis created or stepped up when one partner buys out another in an LLC. The study documents which portion of the buyout's step-up qualifies for accelerated depreciation and which partner's K-1 it applies to.
Do you need a Section 754 election to do cost segregation after a buyout?
You need a 754 election to segregate the specific basis step-up created by the buyout price. Without it, cost segregation can still be applied to the property's original depreciable basis, just not to the new step-up.
How much does a cost segregation study cost for a partnership-owned rental?
A flat-fee study runs $2,200 regardless of how many partners are on the LLC, compared to percentage-fee providers that scale price with property value or ownership count. Turnaround is typically 3 to 5 business days once the closing statement and capital account records are submitted.
Can cost segregation be done years after the partnership bought the property?
Yes, and a buyout is a common trigger for finally ordering one. A Form 3115 accounting method change can catch up missed depreciation from prior years in a single tax return, on top of segregating the buyout's basis step-up.
What happens to depreciation when one partner buys out another?
The buying partner's inside basis in the property can step up to reflect the price paid for the departing partner's interest, but only if the partnership has a 754 election in place. That step-up depreciates separately from the continuing partners' original basis.
Is cost segregation available for LLC-owned Airbnb properties?
Yes, cost segregation applies to residential short-term rentals held in an LLC or partnership, including Airbnb and VRBO properties. It does not apply to commercial property types like office or multifamily buildings over four units.
How long does a cost segregation study take?
A flat-fee residential study typically takes 3 to 5 business days once the property details and, for a buyout, the closing documents are submitted. No site visit is required for most single-family and short-term rental properties.
Does bonus depreciation apply to partnership buyout properties in 2026?
Yes, bonus depreciation runs at 100% in 2026 under the One Big Beautiful Bill Act for property placed in service after January 19, 2025. A buyout's stepped-up basis, once segregated into 5 or 15-year property, qualifies for that same 100% first-year deduction.
One last thing
On a $600,000 residential property, a cost segregation study reclassifying 25% of basis into short-life property puts roughly $150,000 into 5 and 15-year categories. At 100% bonus depreciation in 2026, that's a $150,000 first-year deduction, worth about $55,500 in tax savings at a 37% bracket. Run that same math on just the stepped-up portion of a buyout, and the study often pays for its $2,200 fee inside the first return it's used on.