Cost Segregation for Mobile Home Parks: The Complete Guide

Cost segregation is the single most powerful depreciation tool available to mobile home park owners — and the most consistently underused one. Most MHP operators are depreciating assets over 27.5 or 39 years that the IRS allows them to depreciate over 5 or 15. That is not a planning opinion. It is a classification error that compounds every year you don’t fix it.

This guide explains exactly how cost segregation works for mobile home parks, what qualifies, how the bonus depreciation multiplier changes the math, and what the process actually looks like from engagement to filing.

What Cost Segregation Is — and the IRS Mechanism Behind It

Under the Modified Accelerated Cost Recovery System (MACRS), every depreciable asset is assigned a recovery period. Real property — buildings, structures — typically depreciates over 27.5 years (residential rental) or 39 years (commercial). But MACRS also recognizes that not everything attached to or associated with a property is a long-life structural asset.

Personal property and land improvements depreciate over 5, 7, or 15 years — dramatically faster than the building itself. Cost segregation is an engineering-based study that analyzes a property, identifies all qualifying personal property and land improvements, and produces a defensible, asset-by-asset classification that supports accelerated depreciation on your return. The IRS’s Cost Segregation Audit Techniques Guide describes acceptable methodologies for these studies.

What Qualifies in a Mobile Home Park

Roads and Paving (15-Year Land Improvements)

Internal roads, paving, and parking areas within the park are land improvements, not structural real property. Under MACRS, they depreciate over 15 years. This is one of the largest categories in a typical MHP and one of the most consistently miscategorized.

Utility Infrastructure (15-Year Land Improvements)

Water distribution systems, sewer lines, electrical distribution, gas lines, and storm drainage within the park — everything from the point where the utility enters the park boundary to the individual hookups — are land improvements depreciating over 15 years.

Park-Owned Homes (5-Year Personal Property)

A park-owned home — a mobile or manufactured home that the park owns and leases to residents — is personal property under the tax code, not a structure. It depreciates over 5 years under MACRS, not 27.5 years. For parks with significant POH inventory, the depreciation difference between correct and incorrect classification is material.

Fencing and Signage (15-Year Land Improvements)

Perimeter fencing, security fencing, and park entrance signage are land improvements with 15-year MACRS lives. These are straightforward to identify and often overlooked in the absence of a formal study.

The Bonus Depreciation Amplifier: What It Means Right Now

Cost segregation on its own accelerates depreciation. Combined with bonus depreciation, it can convert a multi-year acceleration into a first-year deduction on qualifying assets. A qualifying percentage of reclassified 5-year and 15-year assets may be deductible entirely in the year you acquire the park, subject to the current bonus depreciation rate.

Bonus depreciation rates have been stepping down under current law. The rate applicable to your acquisition depends on when you place assets in service. This is a time-sensitive planning consideration, not a permanent feature of the tax code. Verify the current rate before filing.

When to Order a Cost Segregation Study

At Acquisition (Preferred)

The ideal time to commission a cost segregation study is at or before closing. A study completed before your first return is filed produces the cleanest results: assets are classified correctly from day one, the study findings inform your Form 8594 purchase price allocation, and you avoid any amended return complexity.

Lookback Study via Form 3115 (For Prior-Year Acquisitions)

If you acquired a park in a prior year without a cost segregation study, you are not required to file amended returns to capture the missed depreciation. A lookback study, combined with a Form 3115, allows you to claim a catch-up deduction (Section 481(a) adjustment) in the current year for all missed depreciation since acquisition. See our asset depreciation schedules page for how this correction works in practice.

What the Process Looks Like After You Engage

Step 1: Information gathering. The cost segregation firm requests closing documents, the purchase price allocation, site plans, utility maps, and the depreciation schedule currently on file.

Step 2: Site visit or remote analysis. For larger parks, the engineering firm may conduct a site inspection to document assets in place. For many MHP studies, a thorough remote analysis is sufficient.

Step 3: Asset identification and classification. The firm produces an asset-by-asset schedule assigning each component to the appropriate MACRS category. This schedule feeds directly into your depreciation schedule and tax return.

Step 4: Report delivery and return preparation. The completed study is delivered with supporting documentation. At The MHP Accountant, we coordinate the study and integrate the results directly into your annual tax planning so you don’t manage two separate relationships.

Common Mistakes MHP Owners Make with Cost Segregation

Waiting until year three or later: Every year you delay is a year you filed with a suboptimal depreciation schedule. The lookback provision via Form 3115 recovers the missed deductions, but you also missed the time value of those deductions.

Not separating POHs from structures: A park with 15 POHs where all 15 are lumped into the real property schedule and depreciated over 27.5 years has a material error on every return.

Using a generalist cost segregation firm without MHP experience: Not all cost segregation firms have worked with mobile home parks. Use a firm with documented MHP experience, or work with an MHP-specialist accountant who can vet the study output.

Frequently Asked Questions

How much does a cost segregation study cost for a mobile home park?

Study fees vary by park size, complexity, and the firm engaged. What matters more than the fee is the net benefit: the additional depreciation generated by the study versus the cost of the study itself. For most MHP acquisitions of meaningful size, the depreciation benefit available through reclassification commonly exceeds the cost of the study in the first year.

Can I do a cost segregation study on a mobile home park I bought three years ago?

Yes. A lookback cost segregation study captures missed depreciation from prior years and delivers it as a catch-up deduction (Section 481(a) adjustment) on your current-year return via Form 3115. You do not need to file amended returns for prior years.

What percentage of a mobile home park’s value typically qualifies for cost segregation?

It varies significantly by park — age, infrastructure condition, POH count, and the presence of community buildings all affect the result. A formal study is the only way to determine the actual number for your specific park. We do not quote generic percentages because they vary too widely to be meaningful without the facts.

Do park-owned homes qualify for bonus depreciation?

Yes. Park-owned homes are personal property under the tax code and qualify for bonus depreciation in the year placed in service, subject to the applicable bonus depreciation rate for that tax year.

What is Form 3115 and why does it matter for MHP cost segregation?

Form 3115 is the IRS form used to request a change in accounting method. When a cost segregation study reveals that assets were previously classified incorrectly, correcting that classification is a change in accounting method. Form 3115 allows you to make that correction and claim a catch-up deduction in a single current-year adjustment, without amending every prior return.

This content is for educational purposes only and does not constitute tax or legal advice. The MHP Accountant recommends consulting a qualified CPA for advice specific to your situation.