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Audit support includedFlat price for every study3 to 5 business days Buying five single-family rentals or a mixed bag of short-term rental cabins in one closing means one contract price and five (or more) separate depreciation schedules. The most defensible way to split that price is the relative fair market value method: get an appraisal or broker valuation for each property, turn those into percentages of the portfolio total, then apply those percentages to the full purchase price plus closing costs. The hidden catch is that this only gets you to a per-property purchase price. You still need a separate land-versus-building split for each address, and a separate cost segregation study for each building, before any of the depreciation math actually starts.
- Relative fair market value allocation is the standard method for splitting purchase price across properties in a portfolio acquisition.
- Each property in a portfolio still needs its own land-building split and its own cost segregation study for 2026 returns.
- A 5-point swing in allocation percentage between two properties can shift tens of thousands of dollars in reclassified basis.
- 100% bonus depreciation applies in 2026 to residential rental property acquired and placed in service after January 19, 2025 under the OBBBA.
Why this matters
A lot of investors closing on a portfolio of Airbnb properties get one settlement statement and one wire transfer, but no line-item breakdown of what each address actually cost. Lenders using a blanket loan often skip the per-property split entirely. If you don't build that allocation yourself, you can't compute land value, you can't compute building basis, and you can't order a cost segregation study on any single property in the deal.
Get the allocation wrong and the error compounds. Overstate one property's share and you inflate its depreciable basis while understating another's, which means one building overclaims deductions and the other underclaims them. In an audit, the IRS looks at whether the allocation method was reasonable and consistently applied across the portfolio, not whether it matches your gut feeling about which house is nicer.
How do you allocate purchase price across properties in a portfolio acquisition?
The standard approach is relative fair market value. Here's how the math actually runs on a three-property deal closed in 2026:
| Property | Appraised value | % of portfolio | Allocated price |
|---|---|---|---|
| STR Cabin A | $945,000 | 45% | $945,000 |
| STR Cabin B | $735,000 | 35% | $735,000 |
| STR Cabin C | $420,000 | 20% | $420,000 |
| Total | $2,100,000 | 100% | $2,100,000 |
In this illustration, a $2,100,000 portfolio purchase splits into three allocated prices based purely on each property's share of total appraised value. That allocated price becomes each property's starting basis before land is stripped out and before a cost segregation study touches it.
Step-by-step: allocating price across a multi-property portfolio
- Get an independent valuation for each property. An appraisal is stronger than a broker opinion, but either beats guessing.
- Calculate each property's percentage of total appraised value. Divide one property's appraised value by the sum of all appraised values.
- Apply that percentage to the full contract price, plus acquisition costs. Title fees, transfer taxes, and inspection costs typically get allocated the same way as the purchase price itself.
- Strip out land value for each property separately. County assessor land-to-building ratios or a standalone appraisal both work; use the same source for every property in the deal.
- Route each property's building-only basis into its own cost segregation study. A portfolio doesn't get one combined study, it gets one study per address.
- Reconcile the allocated prices back to the total contract price. The percentages should sum to 100% and the dollar allocations should sum to the exact closing price on the settlement statement.
Relative fair market value method
This is the default and the one most CPAs expect to see. It relies on current appraised values for every property in the deal, so it reflects condition, location, and renovation differences instead of treating every unit as identical. It takes longer to assemble because you need current valuations for each address, not just one blended number for the portfolio.
Best for: portfolios with properties of noticeably different sizes, conditions, or markets. Verdict: Use.
Tax-assessed value method
Some investors use county tax-assessed values instead of fresh appraisals, since assessed values are already on record and don't cost anything extra to pull. The tradeoff is that assessed values often lag market value by a year or more and can be inconsistent between counties if the portfolio spans state lines.
Best for: fast, low-cost allocation on portfolios inside a single county with recent reassessments. Verdict: Hold, use only as a backup when appraisals aren't practical.
Independent appraisal allocation
A single appraiser valuing the whole portfolio and assigning per-property splits in one report is the most audit-defensible version of this method, since it comes with one consistent methodology across every address instead of stitched-together data from different sources. It costs more upfront than pulling assessed values, but it holds up better if a return gets reviewed.
Best for: larger portfolios (four or more properties) or deals where allocation percentages are close and a challenge to any single number could shift real dollars. Verdict: Buy if the portfolio size justifies the added cost.
Why allocation percentages vary
- Condition differences. A recently renovated unit carries a higher relative value than a deferred-maintenance unit even at the same square footage.
- STR versus long-term rental use. A furnished short-term rental with amenities often appraises higher per square foot than an unfurnished long-term rental in the same portfolio.
- Lot size and location within the portfolio. Waterfront or ski-adjacent lots in a mixed portfolio can carry a disproportionate share of total value.
- Renovation history. Capital improvements completed shortly before closing raise one property's relative share without raising the others.
- Financing structure. A blanket loan across the portfolio doesn't change the allocation math, but individual notes per property sometimes come with lender-ordered appraisals you can reuse.
- Furnishings included in the sale. If furniture and fixtures transfer with only some units, that shifts personal property value separately from real property value.
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Does each property in a portfolio need its own cost segregation study?
Yes, each property needs its own cost segregation study because reclassified asset percentages depend on that specific building's components, age, and finish level, not on the portfolio average. A cabin with a hot tub and a smart lock system reclassifies differently than a plain single-family rental down the road, even if both closed on the same day.
Can you use tax assessor ratios instead of appraisals for the land split?
Tax assessor land-to-building ratios are commonly used for the land split step because assessors already separate land and improvement value for every parcel. The tradeoff is that assessed ratios sometimes lag current market conditions, so a property with recent land value appreciation might show an outdated split.
What happens if closing costs and escrow items aren't allocated the same way?
Closing costs and escrow items tied to the acquisition generally follow the same allocation percentage as the purchase price itself, so a property carrying 45% of appraised value also carries 45% of title fees and transfer taxes. Splitting closing costs on a different basis than the purchase price creates a mismatch that a CPA will need to reconcile before filing.
FAQ
What is purchase price allocation in a portfolio acquisition?
Purchase price allocation is the process of splitting one total contract price across multiple properties bought in the same deal, typically using each property's share of appraised fair market value. It has to happen before land value or cost segregation can be calculated for any individual property.
How do you calculate purchase price allocation across multiple properties?
Divide each property's appraised value by the sum of all appraised values in the portfolio, then apply that percentage to the total purchase price and acquisition costs. The percentages across all properties must sum to 100%.
Do you need an appraisal for each property in a portfolio deal?
An appraisal for each property gives the most defensible allocation, though tax-assessed values or a single portfolio-wide appraisal covering all properties are also used. The stronger the documentation, the easier the allocation is to defend if the return is reviewed.
Can tax-assessed values be used instead of appraisals?
Tax-assessed values can be used, especially for the land-versus-building split within each property, but they can lag current market values by a year or more. Fresh appraisals are generally preferred when properties in the portfolio differ significantly in condition or use.
Does each property need its own cost segregation study?
Yes, each property in a portfolio needs its own cost segregation study because reclassified asset percentages depend on that building's specific components and finish level. A combined study across the whole portfolio does not accurately capture per-property depreciation.
How does bonus depreciation apply to a portfolio purchased in 2026?
Bonus depreciation is 100% in 2026 for residential rental property acquired and placed in service after January 19, 2025 under the One Big Beautiful Bill Act. Each property's placed-in-service date is tracked separately, even within one portfolio closing.
What happens if the allocation doesn't match the closing statement?
The sum of all allocated property prices should reconcile exactly to the total price on the closing or settlement statement. A mismatch usually means a rounding error or a missed line item in the closing costs, and it should be corrected before a cost segregation study is ordered.
Is Form 8594 required for a residential rental portfolio purchase?
Form 8594 applies to asset acquisitions structured as a trade or business sale, which may or may not describe a given residential rental portfolio deal. Whether it applies depends on how the transaction is structured, so this is a question for the CPA handling the closing.
One last thing
The part investors miss most often isn't the math, it's the timing. If two properties in a portfolio close on paper the same day but one isn't rent-ready until three weeks later, each one gets its own placed-in-service date, and that date, not the closing date, is what determines when depreciation and 100% bonus depreciation start running in 2026. Track that separately for every property, or the allocation work upstream doesn't matter.
