What if your new research facility could meaningfully accelerate first-year deductions, freeing capital to fund R&D staffing and equipment? For laboratory owners that meet the technical requirements, the answer is often yes, but the details matter more than the headline.

Take a representative biotech-lab project: a newly built, independently owned facility with cleanrooms, precision HVAC, high-output lighting, and specialty flooring. On projects in this profile, engineering-based studies commonly reclassify 30–40% of total depreciable basis into shorter-life MACRS categories, the top of the 25–40% range we see across commercial property, driven by the density of process systems in a lab.

At that level of reclassification, on a $5 million build, the first-year deduction can move from roughly $128,000 (39-year straight-line) to seven figures, provided the taxpayer can actually use the deduction in the year it is generated.

This article explains:

• Which lab components qualify for accelerated depreciation
• How the permanent 100% bonus depreciation under the One Big Beautiful Bill (OBBBA) actually works, including the acquisition-date test most articles gloss over
• Why a large deduction is not the same as a large cash refund, and what NOL, passive-activity, and interest-limitation rules can do to year-one savings
• How Form 3115 catch-up studies work, and which Revenue Procedure governs them
• The 2025 R&D-expensing change under §174A that is at least as important as bonus depreciation for many lab tenants

Why R&D labs are strong candidates for cost segregation

Research and development labs concentrate basis in specialized, fast-wearing systems: dedicated air handling, wet-lab utilities, process piping, exhaust and vacuum systems, cleanroom envelopes, lab casework, and specialty lighting. Under default MACRS treatment, nonresidential real property is depreciated straight-line over 39 years.[1]

For a full breakdown of MACRS class lives, see our guide to asset recovery periods. Without a formal allocation, components that realistically wear out or are replaced in well under a decade get swept into that 39-year recovery period.

A properly executed cost segregation study, performed in accordance with the IRS Cost Segregation Audit Techniques Guide, separates §1245 personal property and qualifying §1250 land improvements into 5-, 7-, and 15-year MACRS classes, where shorter recovery periods (and, where applicable, bonus depreciation) produce materially larger early-year deductions.

Common short-life assets in R&D settings include:

• Cleanroom finishes and modular wall systems
• Laboratory casework and specialty cabinetry
• Exhaust and ventilation systems serving lab processes (as distinct from base-building HVAC)
• Compressed air and vacuum distribution lines
• Specialty lighting and controls
• Qualifying land improvements (paving, fencing, exterior site lighting, certain landscaping tied to the building)

Not every site-related cost is depreciable. Raw land and general landscaping that is part of land cost remain non-depreciable; only qualifying land improvements receive the 15-year MACRS life.

How cost segregation works for research facilities

A defensible study is an engineering-based analysis that examines every component of the facility to determine which parts qualify for shorter recovery periods. For R&D environments it typically involves:

1. Detailed cost breakdowns of mechanical, electrical, and plumbing systems, distinguishing base-building from process-supporting systems.
2. Reviewing contractor and vendor invoices to separate building and process-related costs.
3. Identifying lab-specific improvements such as fume hoods, gas distribution, and specialized flooring.
4. Allocating qualifying site work (paving, drainage, exterior lighting) to 15-year property.
5. Documenting the methodology against the IRS Cost Segregation ATG so the study is defensible on examination.

The 2025 bonus depreciation rules: What actually changed

This is where most lab-focused articles oversimplify. Here is the accurate picture under current law.

The OBBBA made 100% bonus depreciation permanent, not merely "reinstated"

The One Big Beautiful Bill Act (OBBBA), enacted July 4, 2025, amended IRC §168(k) to provide a permanent 100% additional first-year depreciation deduction for qualified property acquired and placed in service after January 19, 2025.[2]

IRS Notice 2026-11 (January 2026) provides interim guidance and confirms the permanent rate, while also clarifying transition rules.[3]

The acquisition-date test most articles skip

Placing property in service after January 19, 2025, is not by itself sufficient. Per Notice 2026-11:

• Property acquired on or before January 19, 2025, generally remains subject to the TCJA phase-down by placed-in-service year, even if placed in service later: 40% in 2025, 20% in 2026, and 0% in 2027 and after.
• Property acquired and placed in service after January 19, 2025, qualifies for the permanent 100% rate.
• Taxpayers may elect TCJA rates (e.g., 40% / 60%) for the first taxable year ending after January 19, 2025, if that is preferable.

For multi-year lab construction, the "acquisition" determination requires reviewing contract dates and when physical work of a significant nature began, not just the certificate-of-occupancy date.

State decoupling

Many states (including California, New York, New Jersey, and Pennsylvania) do not conform to federal bonus depreciation. State taxable income is computed without the federal bonus deduction, which materially reduces blended-rate savings for taxpayers operating in those states.

The ROI math, done honestly

Consider a hypothetical $5 million life-sciences research lab, both acquired and placed in service after January 19, 2025, where an engineering-based study reclassifies 35% of the depreciable basis ($1.75 million) into 5-, 7-, and 15-year property. All of that reclassified property has a recovery period of 20 years or less, so it is §168(k)-eligible.

Under the OBBBA's permanent 100% bonus rule, the full $1.75 million can be deducted in year one.

A deduction is not a refund: The $525,000 figure assumes the taxpayer has $1.75M of taxable income against which to apply the deduction, in the same year, with no statutory limitation. For many R&D-stage businesses, that assumption does not hold. See "What can limit your year-one cash benefit" below.

What can limit your year-one cash benefit

• Excess business loss limit (§461(l)). For pass-through owners, net business losses usable against wages and investment income are capped at $256,000 single / $512,000 joint for 2026 (indexed). Anything above the cap becomes an NOL carryforward.
• Net operating losses (§172). Many biotech and research-stage businesses already operate at a loss. A large bonus depreciation deduction simply adds to the NOL carryforward. Post-2017 NOLs cannot be carried back (outside narrow exceptions) and can offset only 80% of taxable income in future years.
• Passive activity loss rules (§469). Where an LLC holds the lab real estate and leases it to a related operating company, the rental is passive by definition under §469(c)(2), however much the owner participates, so material participation in the rental itself does not free the losses. The exits that do work:
  
  • Real estate professional status under §469(c)(7), which a scientist-founder rarely meets.
  • The grouping election under Reg. §1.469-4(d)(1): a rental can be grouped with the trade or business it rents to when the two are owned in the same proportion (or the rental is insubstantial). Once grouped, the rental losses follow the owner's material participation in the operating business. For a founder who owns both entities, this is usually the exit that actually works.
  • The self-rental rule, Reg. §1.469-2(f)(6), cuts the other way: net rental income from a lease to a business in which you materially participate is recharacterized as nonpassive, so a related-party lease cannot be used to manufacture passive income that absorbs other passive losses.
  • If an operating C corporation owns the lab directly, §469 does not apply at all, unless it is closely held, where the modified rule lets passive losses offset active business income.
• §163(j) interest limitation. Real-estate businesses can elect out of §163(j), but the election forces ADS on nonresidential real property, residential rental property, and QIP. The only bonus depreciation it costs you is on QIP: the 5-, 7-, and 15-year components a study identifies keep 100% bonus. The election is a one-way door.
• Recapture on sale. Reclassifying basis into §1245 personal property accelerates current deductions but converts what would have been §1250 gain (capped at 25% unrecaptured) into ordinary-income depreciation recapture at sale. 15-year land improvements are §1250 property, so there only the excess of accelerated depreciation over straight-line is ordinary, with the straight-line portion staying at the 25% rate. Run the lifetime, not just the year-one, math.
• State decoupling. As noted above.

A well-scoped cost segregation engagement should model these constraints before the study is commissioned, not after.

The 2025 R&D-expensing change you should not ignore

For an R&D-lab audience, the OBBBA change with the largest direct operating impact is often not §168(k) but §174A, which restored immediate deduction of domestic research expenditures (reversing the 2022–2024 capitalization regime under §174). Lab tenants whose costs are dominated by research spending (rather than facility build-out) will frequently see larger tax benefit from §174A than from facility-side cost segregation. The two are not mutually exclusive, and the optimal stacking depends on entity structure, taxable-income posture, and whether the taxpayer elected §174A retroactively.

One structural point connects them: depreciation on property used in research is itself a research or experimental expenditure under Reg. §1.174-2(b)(1). For domestic research that is not a problem, since §174A allows a current deduction. But depreciation allocable to foreign research, bonus included, still goes into 15-year §174 amortization regardless of its MACRS class. Depreciation is also not a qualified research expense for the §41 credit.

Form 3115 look-back studies

If you've owned a lab facility for more than one tax year without performing a cost segregation study, a look-back study can generally let you catch up without amending prior returns:

• File Form 3115 with the current-year return to change the method of accounting for depreciation.[4]
• The procedure is an automatic change under Rev. Proc. 2015-13 (general procedures) and the current automatic-change list in Rev. Proc. 2025-23 (DCN 7, impermissible to permissible method of accounting for depreciation).
• The two-return rule decides the path: if only one return has been filed on the old method, amend it; Form 3115 applies once two or more returns have been filed on it.
• The catch-up uses the bonus rate in effect for the year the lab was originally placed in service, not today's 100%.
• The cumulative difference between depreciation claimed and depreciation that should have been claimed is taken as a §481(a) adjustment in the year of change.
• No IRS pre-approval is required for automatic changes.

Look-back studies are most valuable when the taxpayer expects the year of change to have meaningful taxable income against which the §481(a) catch-up can be applied.

Common oversights in lab cost segregation

• Treating process systems as building infrastructure. Lab-dedicated exhaust, vacuum, or chilled-water systems often qualify for shorter lives but are routinely misclassified into 39-year property.
• Mis-handling tenant improvements. A lessee may depreciate improvements it pays for and retains tax ownership of. Qualifying improvements may be Qualified Improvement Property (QIP) under §168(e)(6), 15-year, bonus-eligible. Tenant-allowance and landlord-owned scenarios are treated differently and should be diligenced before claiming a deduction.
• Overlooking cleanroom-specific components. Modular wall systems, integrated flooring, and lighting designed for controlled environments are frequently eligible for 5- or 7-year treatment when their function is process-supporting.
• Failing to document costs early. Without detailed cost records, later reclassification becomes harder and more conservative.
• Ignoring the acquisition-date test under OBBBA. As described above, the §168(k) regime that applies depends on the acquisition date, not just the placed-in-service date.
• Pretending state conformity exists. Build state decoupling into the model from day one.

When to commission a cost segregation study

• After new construction or acquisition, capture eligible assets before the first tax filing for the property.
• Following a major renovation or lab conversion, reclassified improvements can generate immediate deductions.
• During leasehold build-outs, lessee-funded improvements may qualify if the lessee bears the cost and retains tax ownership.
• Retroactively, via a Form 3115 catch-up as described above.

Bottom line

For laboratory owners that meet the OBBBA acquisition-and-placed-in-service test, have current or near-term taxable income to absorb the deduction, and are not constrained by §469, §163(j), or state non-conformity, a well-executed engineering-based study can convert a meaningful share of facility cost into year-one deductions. For pre-revenue or NOL-positioned businesses, the same study may still be worth doing, but the value is in future NOL utilization, not a year-one refund.

The honest answer is almost always: model the constraints first, then commission the study. If you're evaluating whether a laboratory or research-facility project warrants a study, you can get a free proposal from our team or learn more about our cost segregation services.

‍