Cost Segregation: Is It Worth It for Your Rental Property?

A rental property can generate positive cash flow and still report a tax loss. Cost segregation can make that difference much larger by moving some depreciation deductions into earlier years.

But a $100,000 deduction does not mean a $100,000 tax refund. It may not even reduce your current tax bill.

Cost segregation is worth considering when the value of deductions you can actually use exceeds the study and implementation costs, after accounting for future deductions and eventual sale taxes. For rental property owners, that requires examining both the property and the person filing the return.

Here is how the decision could look for a hypothetical Florida investor buying a $750,000 rental property in 2026.

What is cost segregation?

Cost segregation separates a property’s depreciable cost into components with different tax recovery periods. Instead of treating all eligible costs as part of the building, a supported analysis may identify shorter-lived personal property and land improvements.

Residential rental buildings generally depreciate over 27.5 years under the general depreciation system. Land is not depreciable. Depreciation starts when a property is ready and available for rent, which may differ from the closing date. See IRS Publication 527.

Components such as eligible appliances, carpeting and certain exterior improvements may receive shorter recovery periods, depending on their characteristics and use. Structural building costs remain on the applicable building schedule.

For eligible property acquired and placed in service after January 19, 2025, current federal law generally provides 100% bonus depreciation. Qualifying shorter-lived components may therefore be deducted immediately. Acquisition rules, related-party restrictions and other exclusions still apply; neither land nor an ordinary residential rental building becomes fully deductible simply because a study is performed. See IRS Publication 946.

Rental property example: with and without cost segregation

Suppose an investor purchases a long-term rental for $750,000 in an unrelated-party transaction in 2026 and makes it ready and available for rent in January.

For this example, assume:

• $150,000 is allocated to nondepreciable land.
• $600,000 is the depreciable basis, ignoring additional capitalized closing costs.
• A supported study assigns $120,000 to eligible shorter-lived components and $480,000 to the building.
• All $120,000 of those components qualify for 100% bonus depreciation.
• The study quote is $4,000, with $1,000 of additional tax implementation work.

These are hypothetical assumptions, not a promised allocation or a market-price quote. The baseline assumes the $600,000 would otherwise be properly depreciated entirely as building cost. Separately identifiable assets should receive their correct treatment even without a formal study.

Item	Without study	With study
Purchase price	$750,000	$750,000
Land, excluded from depreciation	$150,000	$150,000
Basis assigned to 27.5-year building	$600,000	$480,000
Basis assigned to bonus-eligible components	$0	$120,000
First-year building depreciation, approximately	$20,909	$16,727
First-year bonus depreciation	$0	$120,000
Total first-year depreciation, approximately	$20,909	$136,727
Study and additional implementation cost	$0	$5,000

The building calculations use the residential mid-month convention: basis divided by 27.5, multiplied by 11.5/12 for a January placed-in-service date. Actual return amounts can differ slightly with tax-table rounding. The table excludes any deduction for professional fees, whose treatment requires separate analysis.

The study produces approximately $115,818 of additional first-year depreciation in this illustration. It accelerates recovery of the same $600,000 depreciable basis; it does not create another $120,000 of property cost.

What could the additional deduction save?

If the entire additional deduction is usable now and reduces income taxed at a constant 32% federal marginal rate, the simplified tax reduction is:

$115,818 × 32% = approximately $37,062.

After the assumed $5,000 project cost, that leaves approximately $32,062 of first-year cash benefit, before any tax treatment of the fees.

That calculation is a scenario, not an estimate for every investor. A deduction can cross tax brackets, interact with other provisions or be suspended. The full-return projection determines the result.

There is also a future tradeoff. With the $120,000 already deducted, it produces no further depreciation deductions unless additional basis arises. During later full years, the remaining $480,000 building basis produces approximately $17,455 annually, versus $21,818 on the original $600,000 building basis. The earlier deduction means smaller deductions later.

Why a large rental deduction may not reduce this year’s taxes

Rental real estate is generally passive for federal tax purposes. Passive losses generally offset passive income rather than wages or unrelated business earnings.

An eligible actively participating owner may qualify for a special rental loss allowance of up to $25,000. It generally phases out between $100,000 and $150,000 of modified adjusted gross income; filing-status rules can change the result.

Real estate professional status alone does not make losses nonpassive. The owner must also satisfy material participation requirements. Certain short-term lodging activities fall outside the passive rules’ rental definition, but that does not automatically establish nonpassive treatment.

Basis, at-risk and excess business loss limitations may also affect deductions. Disallowed passive losses generally carry forward. See IRS Publication 925.

Compare two owners of the same property

Assume the property has $15,000 of taxable rental profit before depreciation, and neither owner qualifies for the special rental loss allowance.

Owner A has $150,000 of other passive rental income. Assuming no other limitation applies, both depreciation scenarios can be fully absorbed by the combined passive income. The additional depreciation could deliver a current benefit approaching the simplified $37,062 calculation above.

Owner B earns $400,000 from employment and has no other passive income. Assume the rental remains passive. Without the study, the $20,909 depreciation offsets the $15,000 rental profit and leaves approximately $5,909 suspended. With the study, approximately $121,727 is suspended.

Both scenarios eliminate the same $15,000 of current rental profit. The study adds approximately $115,818 of suspended losses and, under these assumptions, no additional current federal income-tax reduction. Owner B still pays the $5,000 project cost.

This is why reviewing the tax return before commissioning the study matters. The same property-level deduction can produce very different cash results.

How much does a cost segregation study cost?

There is no single cost segregation study cost that applies to every rental property. Obtain a written quote based on the building, records, complexity and scope of work.

For the property above, $4,000 is an assumed study fee. The additional $1,000 illustrates tax work outside the study itself. Neither figure represents MFS pricing or a verified industry average.

When comparing proposals, ask what the fee includes:

• Property inspection or other documented methods of identifying components.
• Reconciliation to the property’s tax basis and existing asset schedule.
• Support for classifications, useful lives and assigned costs.
• Coordination with the professional implementing the study on the return.
• Assistance if the conclusions are questioned.

A low quote with limited documentation may require more implementation work. An expensive report can also be poor value if its deductions will remain suspended for years.

What happens when you sell the rental property?

Depreciation reduces adjusted tax basis, which can increase gain on sale. For Section 1245 assets, gain is generally ordinary income up to depreciation allowed or allowable. Different rules apply to building depreciation; unrecaptured Section 1250 gain can face a federal rate of up to 25% for individuals. Sale proceeds must be allocated appropriately among assets. See IRS Publication 544.

For example, suppose $80,000 of the accelerated deduction relates to fully depreciated Section 1245 components. If those components are later sold for an appropriately allocated $50,000, their zero adjusted basis produces $50,000 of gain, generally treated as ordinary-income recapture. The original $80,000 deduction does not automatically mean $80,000 of recapture in that transaction.

Suspended passive losses can generally become deductible upon a fully taxable disposition of the entire activity to an unrelated party, subject to applicable rules. That may help the sale-year result, but it does not mean every transfer releases losses. See IRS Publication 925.

Before commissioning a study, model an expected holding period and sale scenario. A planned sale in two years deserves a different calculation from a long-term hold.

Can you use cost segregation on a property you already own?

Potentially. A later study can identify depreciation differences on an existing property. Implementation may require an accounting-method change using Form 3115 and a Section 481(a) adjustment rather than simply changing the current depreciation schedule.

The original acquisition and placed-in-service dates still matter. Completing a study in 2026 does not automatically make an older property’s components eligible for the current 100% bonus rule. See IRS Publication 946.

When is cost segregation worth considering?

It merits a closer look when there is substantial supported shorter-lived basis, a realistic path to using the deductions and an expected holding period that makes acceleration valuable.

It may be less attractive when the project cost is high relative to the usable deduction, losses are likely to remain suspended, the owner plans to sell soon or records are too weak to support the allocation.

Ask your tax adviser for three comparisons: your return without the study, your return with the study and a projected sale-year calculation. The decision should use after-tax cash flow over time rather than the largest number in a depreciation estimate.

Review your property with McGregor Financial Services

Before paying for a study, establish whether the additional depreciation fits your tax position.

McGregor Financial Services’ real estate tax planning and accounting services connect property-level records with your broader financial picture. A cost segregation review should consider existing depreciation, income, participation, loss carryforwards, implementation costs and plans for the property.

Bring your closing statement, depreciation schedules, improvement invoices, recent tax returns and any study proposal. Together, those records support a more useful question: How much could this strategy improve your after-tax cash flow, and when?

Speak with an MFS advisor before commissioning a cost segregation study.