Cost Segregation for a Newly Acquired MHP vs a Park You’ve Owned for Years

One of the most common scenarios we see at The MHP Accountant® is an MHP owner who has held a park for several years — depreciating it on the default schedule a generalist CPA set up at closing — and who is now discovering that accelerated depreciation was an option from day one.

The follow-up question is always: “Is it too late? Can I still do something?”

The answer is yes — but the mechanics, timing, and economics differ meaningfully from what would have been available at acquisition. This post compares the two scenarios side by side so you understand exactly what you can do, what it costs, and which path produces the better financial result.

Scenario 1: New Acquisition — The Ideal Window

Performing a cost segregation study at the time of acquisition — in the year you buy the park — is the highest-value scenario. Several factors converge that make it the optimal timing.

Bonus depreciation at acquisition-year rates. The applicable bonus depreciation percentage depends on when property is placed in service. When you purchase a park, the year of acquisition establishes the rate available for bonus-eligible assets. If that year’s bonus rate is higher than what will be available in future years due to the phase-down schedule, you capture the benefit of the higher rate by doing the study in the acquisition year.

Clean Form 8594 allocation. When you purchase a park in an asset transaction, both buyer and seller file Form 8594 (Asset Acquisition Statement) documenting the purchase price allocation among asset classes. The cost segregation study informs the correct allocation on Form 8594 — ensuring that the right amounts are assigned to 5-year personal property (POHs), 15-year land improvements, 27.5-year structures, and non-depreciable land. A well-executed Form 8594 creates a clean, documented foundation for your entire depreciation strategy.

No catch-up complexity. In the acquisition year, you are simply establishing the depreciation schedule for the first time. There is no change in accounting method, no Form 3115, no calculation of a prior-year adjustment. The study findings are incorporated directly into your first-year return.

Maximum time-value benefit. The earlier you take accelerated deductions, the more time-value benefit you receive. A $500,000 deduction in Year 1 is worth more — in present value terms — than the same deduction in Year 3 or Year 5.

What to Document at Acquisition

For a new acquisition, the documentation package for the cost segregation study typically includes:

• Closing statement and HUD-1 or equivalent settlement statement
• Purchase price allocation (Form 8594 draft or agreed allocation)
• Appraisal of the property if available
• Survey and site plan
• Prior owner’s depreciation schedules (if obtainable)
• Construction records or improvement documentation if available
• List and inventory of park-owned homes, with titling information

The more complete the documentation package, the more accurate and defensible the study. Parks acquired at auction or from estates — where documentation is often limited — require the engineer to rely more heavily on on-site observation and cost estimation, which introduces more variability into the results.

Scenario 2: Existing Ownership — The Lookback Study

If you have owned your MHP for one or more years and depreciated it on the default straight-line or incorrect schedule, you have not permanently forfeited the accelerated depreciation you should have been claiming. You can recapture the difference through a process called a lookback cost segregation study, implemented through IRS Form 3115.

Here is how it works: A cost segregation engineer performs the same analysis they would have performed at acquisition — reviewing the property, identifying reclassifiable assets, and allocating the purchase price among MACRS categories. The study produces the same asset schedule it would have produced at closing.

The difference is what happens with the results. Rather than setting up a depreciation schedule going forward, the study calculates the cumulative difference between the depreciation you should have claimed under the reclassified schedule vs. what you actually claimed under the original (default) schedule. This difference — the cumulative “catch-up” — is called a Section 481(a) adjustment.

The Section 481(a) adjustment is claimed in its entirety in the year the Form 3115 is filed. You do not amend prior-year returns. You do not go back and refile three years of returns. The entire catch-up deduction flows through your current-year return as a single adjustment. This is a well-established, IRS-approved procedure that has been used extensively by real estate owners.

The Key Differences: New Acquisition vs Lookback Study

The Bonus Depreciation Problem with Lookback Studies

This is the most important practical difference between the two scenarios, and it deserves clear explanation.

When you identify reclassifiable assets through a lookback study, the catch-up deduction you claim is for the difference in regular MACRS depreciation — not bonus depreciation — for the prior years you held the property. The catch-up represents what straight-line MACRS depreciation would have been on the reclassified assets from acquisition through the current year, less what you actually claimed.

The bonus depreciation you would have been entitled to in the year of acquisition — by immediately expensing the reclassified assets at the then-applicable bonus rate — is generally not recoverable through a lookback study. Bonus depreciation is tied to the year assets are placed in service, and that window has passed.

This means: if you acquired your park in a year when bonus depreciation was at a high rate, and you are now performing a lookback study several years later when bonus has phased down, you are receiving catch-up at regular MACRS rates rather than the bonus rate you could have claimed at acquisition. The economics of the lookback study are real and meaningful — but they are less favorable than what a timely acquisition-year study would have produced.

When a Lookback Study Still Makes Strong Economic Sense

Despite the bonus depreciation limitation, lookback studies frequently produce substantial, near-term tax benefits. The Section 481(a) catch-up adjustment can be a very large number — representing years of accumulated difference between accelerated and straight-line depreciation on reclassified assets. For a park you have owned for five or more years, this catch-up can represent hundreds of thousands of dollars in deductions claimed in a single year.

The question, as always, is whether you have the taxable income to absorb the deduction. If this is a high-income year — from park operations, other business income, or a significant event creating income — a large lookback adjustment can be strategically valuable. Your MHP accountant should analyze your tax situation and identify the year in which the lookback study produces the greatest current benefit.

For owners who have recently qualified as real estate professionals, or who have generated passive income through portfolio growth, a lookback study can unlock deductions that were sitting dormant in the depreciation schedule for years.

Planning Implications: Why the Acquisition Year Matters

The core lesson of this comparison is that the acquisition year is the highest-leverage point for cost segregation planning. Every year you delay the study after acquisition, you are foregoing time-value benefit and potentially foregoing bonus depreciation eligibility at a higher phase-in rate.

If you are acquiring a park now, the time to plan your cost segregation strategy is at closing — ideally in the weeks before closing, as part of your pre-acquisition due diligence. Your MHP-specialized tax advisor should be part of that process, not brought in after the fact to “clean up” a depreciation schedule that was set up without MHP expertise.

Understanding the full cost segregation picture — including bonus depreciation interaction, recapture at sale, and the POH-specific rules — is essential context for this decision. See our guide to cost segregation and bonus depreciation, our analysis of recapture at sale, and our straight-line vs cost segregation comparison for the complete framework.

Frequently Asked Questions

Disclaimer: This post is for educational purposes only and does not constitute tax, legal, or financial advice. Tax laws change and individual circumstances vary. Consult a qualified tax professional before making any decisions based on information in this article. The MHP Accountant® is an enrolled agent firm; services do not include legal advice.