For edge / colocation / enterprise on-prem operators

Cost segregation for small-to-mid data centers

Engineering-method studies for edge, colocation, and enterprise on-prem investments. Sub-$25M basis: published pricing. $25M+: by proposal. Same IRS Pub 5653 methodology Big-4 firms use, without the institutional engagement model.

Engineering-method · IRS Pub 5653 · RSMeans 2026 · Rev. Proc. 87-56

Why data center reclassification is higher than typical commercial

Typical office and retail commercial reclassifies 25–35% of basis into accelerated 5/15-year MACRS. Data centers reclassify 45–60% because the asset mix is dominated by process-specific equipment, not building shell. Higher than typical commercial (25–35%) because data center personal-property density (UPS, racks, cooling, electrical, fire suppression) is structurally greater. Combined with 100% bonus depreciation restored permanently under OBBBA (PIS after 1/19/2025), year-1 deductions on DC investments are the largest in commercial real estate.

Ranges below reflect typical small-to-mid data center engineering estimates. Actual study figures depend on basis composition, capex history, and PIS allocation across acquisition + capex phases.

Personal property

5-year MACRS

Equipment-specific and facility-process-specific components. Removable / not part of the building shell. Eligible for 100% bonus depreciation under §168(k) per OBBBA (PIS after 1/19/2025).

Component Typical basis share
UPS systems (centralized + rack-mounted)
Uninterruptible power supply, dedicated to facility process
 8–15%
Server racks, cable ladders, network equipment
Removable, facility-specific personal property
 3–8%
PDU and branch electrical distribution
Equipment-specific power distribution (vs. building-shell wiring)
 5–10%
CRAH / CRAC precision cooling units
Process cooling for IT load, not human-comfort HVAC
 8–15%
Backup generators (interior, dedicated)
When dedicated to facility process; exterior pad-mounted may classify differently
 3–7%
Fire suppression (FM-200, Inergen, VESDA)
Process-specific fire protection beyond building-code minimum
 2–4%
Security infrastructure (biometric, mantraps, CCTV)
Facility-specific access control
 1–3%
Structured cabling, patch panels, fiber pathways
Removable, equipment-specific
 2–4%
Hot/cold aisle containment
Modular, removable architectural element
 1–3%

Land improvements

15-year MACRS

Site work and exterior improvements; also includes Qualified Improvement Property (QIP) for interior, non-structural improvements to non-residential buildings post-placed-in-service.

Component Typical basis share
Site work, perimeter fencing, parking, landscaping
 3–6%
Pad-mounted exterior generators + fuel storage
 1–3%
External chilled-water plant, cooling towers
 3–7%
External transformer pads, site switchgear
 2–4%
QIP — interior non-structural improvements (post-PIS)
15-year QIP per TCJA / CARES; tenant build-out for colocation; office-to-DC conversions
 varies

Building shell

39-year MACRS (non-residential)

Structural building elements that are NOT eligible for accelerated MACRS. Base-building HVAC for human-comfort areas (not IT load) and life-safety electrical are also 39-year.

Component Typical basis share
Structural slab, walls, roof, building envelope
 25–40%
Base-building HVAC (human-comfort areas)
Separate from IT-load process cooling
 3–6%
Base-building electrical (life safety, exterior lighting)
 3–6%

Choose your situation

Component analysis is the same across data center types. Pricing, intake, and reporting framing differ.

Edge / Sub-1MW
Edge data centers

Regional carriers, 5G infrastructure, micro-DC operators. $1–10M basis. Published pricing from $4,995.

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Colocation
Regional colocation operators

Multi-tenant 1–10MW facilities, partnership-held. $10–40M basis. K-1 aware reporting; tenant build-out QIP support.

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Enterprise on-prem
Enterprise on-prem facilities

Bank, healthcare, large enterprise CIO/CFO. $5–25M basis. Form 3115 §481(a) lookback on prior-year placed-in-service infrastructure.

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Hyperscale · $50M+
Hyperscale engagements

$50M+ basis. Published floor from $49,995; by-proposal above $100M campus basis. Same Rev. Proc. 87-56 + IRS Pub 5653 framework as smaller engagements; named credentialed engineering partners brought in per engagement.

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Worked example: $25M small colocation facility

Illustrative; depends on basis composition, capex history, ownership structure, §469 status, and your CPA's tax position when the deduction lands.

Property type
Regional colocation operator (partnership-held)
Depreciable basis
$25,000,000
Illustrative engineering-estimated reclassification
48% = $12,000,000 into accelerated MACRS
Year-1 deduction
$9,200,000 (100% OBBBA bonus on 5/15-year property)
Estimated federal tax savings
$3,400,000 at 37% federal marginal
Study fee
$29,995

Assumes 37% federal marginal tax rate. State treatment, passive-activity rules under §469, and partnership-level allocations may alter the realized benefit. Verify with your CPA.

Pricing

Indicative ranges at sub-$25M basis. $25M+ scoped per engagement. All studies include §481(a) lookback workpapers where applicable.

Basis Study fee (indicative)
< $1M basis $4,995
$1M – $3M basis $6,995
$3M – $10M basis (edge / micro DC) $11,995
$10M – $25M basis (small colocation / enterprise) $29,995
$25M – $50M basis By proposal (typical $35k–$50k)
Hyperscale ($50M+ basis) From $49,995

Pricing scales by complexity (single-tenant vs. multi-tenant, capex composition, prior-year lookback need). Bundle discounts apply on multi-facility portfolios.

What can move pricing beyond the published bands
  • Cooling architecture — chilled-water plant + economizer + N+2 redundancy adds engineering complexity over standard CRAH/CRAC. See cooling depreciation reference.
  • Redundancy tier — Tier III/IV facilities require dual-path documentation that adds workpaper scope.
  • Tenant structure — lessor-vs-tenant lessee improvement allocations on colocation engagements require additional allocation modeling.
  • Documentation availability — full architectural / MEP drawings + commissioning reports vs. sparse handover docs change site-visit and reconstruction effort.
  • Mixed-use shells — DC + office + warehouse combined shells require multi-component allocation across the entire building, not just DC space.
  • §481(a) lookback complexity — multi-year placed-in-service lookbacks with capex events between original PIS and today add cumulative-catch-up workpaper scope.

Component classification references

Technical depreciation references for the highest-density reclassification components in any data center engagement. Each page documents the 5-year vs. 15-year vs. 39-year MACRS split with Rev. Proc. 87-56 and IRS Pub 5653 citations.

Honest scope — what we will and won't do

Cost Seg Smart studies are engineering-team-reviewed, engineering-team-signed (not individual-signed). Every report passes a 16-check QC validator before delivery. We use RSMeans 2026 cost data and Rev. Proc. 87-56 component classifications, with stated rationale per component.

Engagement structure scales with property complexity: sub-$25M basis runs at indicative published pricing ($4,995–$29,995) with automated-engineering analysis and engineering-team review; $25M–$50M basis is by-proposal (typical $35k–$50k) with site walkthrough and expanded engineering review; $50M+ hyperscale engagements start at a published floor of $49,995 and scale by proposal above $100M campus basis, with named credentialed engineering partners (CCSP, ASHRAE TC 9.9, specialty MEP) brought in per engagement to author and sign the report cover. Same Rev. Proc. 87-56 / IRS Pub 5653 framework throughout; documentation rigor scales to the dollar volume.

At $3M+ basis, site visits are routine when property complexity warrants. We're glad to work with your facilities engineer, HVAC contractor, or commissioning partner on component documentation; the cost segregation analysis is ours to deliver.

Frequently asked

Why is reclassification % higher on data centers than typical commercial?
Data centers are personal-property-dense by design: UPS systems, server racks, PDU electrical distribution, CRAH/CRAC precision cooling, fire suppression (FM-200/Inergen/VESDA), security infrastructure, structured cabling, and hot/cold aisle containment are all facility-process-specific (5-year MACRS per Rev. Proc. 87-56), not building-shell components. Typical small-to-mid data center investments reclassify 45–60% of basis into accelerated MACRS, vs. 25–35% for office or retail. See IRS Pub 5653 for the examiner framework.
What did OBBBA do for data center cost seg?
The One Big Beautiful Bill Act (signed July 2025) permanently restored 100% bonus depreciation under §168(k) for qualifying property placed in service after January 19, 2025. Because data centers reclassify the highest percentage of basis into 5/15-year MACRS, they capture the largest year-1 deduction in commercial real estate under the new rule. Verify treatment with your CPA before filing.
How does cost segregation flow through to investors in a partnership-held colocation facility?
Cost segregation accelerates depreciation at the entity level. In a partnership or LLC holding the colocation facility, the resulting depreciation is allocated to partners per the operating agreement and surfaces on each partner's K-1. Whether and when individual partners can use the loss depends on at-risk basis (IRC §465), passive-activity limits (IRC §469), and election status. The study is identical regardless of structure; how it lands at the investor level depends on the partnership's tax position. Coordinate with your CPA before scoping.
We placed our enterprise on-prem data center in service years ago. Can we still claim accelerated depreciation?
Yes. Form 3115 (Application for Change in Accounting Method) under automatic-consent procedures in Rev. Proc. 2015-13 may allow a §481(a) cumulative catch-up of previously-missed accelerated depreciation in the current year — without amending prior returns. This is often the single most valuable engagement for enterprise customers with on-prem DCs placed in service before 2025. We provide the §481(a) workpaper pack; your CPA files the Form 3115. Verify treatment with your CPA before filing.
Do you require a site visit?
Site visits are routine at $3M+ basis when property complexity warrants — specialized cooling infrastructure, custom electrical distribution, significant tenant build-out, or unusual MEP configurations. For smaller edge facilities and standard configurations, satellite imagery, county assessor records, RSMeans 2026 cost data, structured property documentation, and customer-supplied capex schedules / equipment lists are typically sufficient. The IRS Cost Segregation Audit Techniques Guide does not require a site visit; it requires engineering-based classification and component-level documentation.
What's your audit defense process for a data center study?
Every Cost Seg Smart study includes engineering-team review, a 16-check QC validator before delivery, RSMeans citation per component, and Rev. Proc. 87-56 asset class mapping with stated rationale. If your study is examined, we respond directly to examiner questions, provide workpaper exhibits (cost-allocation schedule, RSMeans citations, equipment-list cross-references), re-derive §481(a) computations if a lookback is challenged, and supply engineering attestation reconfirming the report — at no additional charge within 36 months of delivery. We do NOT provide IRS representation (your CPA / EA / attorney handles that under Circular 230). Full scope at /audit-defense/.
How does engagement structure differ between small-to-mid DC and hyperscale work?
Sub-$25M basis (edge, small colocation, enterprise on-prem) runs at indicative published pricing — $4,995 at the entry tier up to $29,995 at the $10M–$25M tier — with automated-engineering analysis and engineering-team review. $25M–$50M basis is by proposal (typical $35k–$50k) with engagement scoping that includes site walkthrough and expanded engineering review. $50M+ hyperscale engagements start at a published floor of $49,995 and scale by proposal above $100M campus basis, with named credentialed engineering partners brought in per engagement (CCSP, ASHRAE TC 9.9, specialty MEP) to author and sign the cover, plus the documentation rigor and §481(a) workpaper scope that hyperscale dollar volumes require. The Rev. Proc. 87-56 / IRS Pub 5653 framework is identical across tiers; engagement structure scales.

Talk to us about your data center.

Send the closing statement, equipment list, or capex schedule and we'll model a same-day preliminary. Sub-$25M basis can self-serve via the order form at indicative-range pricing. $25M+ routes through a brief scoping call.

Send the closing statement or capex schedule — we'll model a same-day preliminary. No commitment.