Mobile Home Park Infrastructure Improvements: A Depreciation Guide

Infrastructure is the backbone of every mobile home park. Roads, water lines, sewer systems, electrical distribution, natural gas networks, and stormwater drainage — these systems make your lots usable and your park operable. They’re also significant capital assets, and understanding how they depreciate determines how much of that investment you can recover on your tax return.

Most MHP owners know depreciation exists. Few understand how to maximize it on their infrastructure. That gap — between what you’re currently deducting and what you’re entitled to deduct — is often worth tens of thousands of dollars over the life of your ownership.

This guide covers every major MHP infrastructure category, its MACRS classification, the capital improvement vs. repair distinction, and how cost segregation unlocks depreciation you’d otherwise leave behind.

The MACRS Framework for MHP Infrastructure

The Modified Accelerated Cost Recovery System (MACRS) governs how you depreciate business property. For most MHP infrastructure, the relevant MACRS class is 15-year land improvements — a faster recovery period than the 27.5-year residential rental or 39-year commercial property classifications.

Here’s why this matters: a 15-year land improvement depreciates approximately twice as fast as a 27.5-year residential asset using the 150% declining balance method. Every dollar of infrastructure allocated to the 15-year class recovers more quickly, reducing your taxable income sooner.

The IRS defines land improvements broadly under Rev. Proc. 87-56 as “depreciable improvements directly to or added to land” — roads, parking lots, fences, landscaping, drainage systems, and similar outdoor infrastructure. MHP utility distribution systems generally fall into this category when they serve the lots rather than a specific structure.

Depreciation by Infrastructure Category

Roads and Paving

Internal park roads — the paved or gravel drives that connect the lots — are classic 15-year land improvements under MACRS. This includes the road base, asphalt or concrete surface, curbing, and speed bumps.

Roads are also eligible for bonus depreciation (discussed below), which means you can deduct a substantial portion of a road construction or reconstruction project in the year it’s placed in service. For a park undergoing significant infrastructure rehabilitation, this can generate a large first-year deduction.

Water Distribution Systems

The water distribution system serving your lots — underground supply lines, meters, meter pits, isolation valves, hydrants, and the master meter connection — generally qualifies as a 15-year land improvement. The system serves the land (the lots) rather than any specific structure.

If your park has a private water treatment system (a well, pump house, or treatment equipment), the equipment component may qualify as 5-year or 7-year personal property, depreciating even faster than the distribution lines. A cost segregation study properly separates these components.

Sewer and Septic Systems

Sewer lines, lift stations, septic tanks, and leach fields that serve the lots are generally 15-year land improvements. The classification holds whether you’re connected to a municipal system or operating a private system.

A private septic system may include equipment components (pumps, blowers, control panels) that qualify as shorter-lived personal property. Treating the entire system as a single 15-year asset without segregating these components means you’re depreciating some equipment too slowly.

Electrical Distribution

The electrical distribution system in an MHP — underground conduit, wiring, transformers, pedestals, and meters serving individual lots — is typically a 15-year land improvement. Like other lot-serving utility infrastructure, it’s classified based on its function (serving the land) rather than any permanent structure.

Utility-owned metering equipment may not be your asset at all — verify ownership before depreciating. In sub-metered parks using RUBS or individual billing, the metering infrastructure you own is depreciable personal property, often at a faster rate than the distribution lines.

Natural Gas Systems

Underground natural gas distribution lines running to pads that have gas connections are 15-year land improvements. Any above-grade regulator stations or metering equipment may qualify as shorter-lived personal property.

Natural gas infrastructure is increasingly relevant as parks upgrade from propane to natural gas — a significant capital improvement that carries substantial depreciation benefits in the upgrade year.

Stormwater and Drainage

Stormwater management infrastructure — retention ponds, drainage swales, underground detention, catch basins, and culverts — qualifies as 15-year land improvements. These systems are directly tied to the land, serve no specific structure, and fit squarely within the Rev. Proc. 87-56 land improvement category.

Capital Improvement vs. Repair: The IRS Framework

Not every dollar spent on MHP infrastructure is a capital expenditure. The IRS tangible property regulations (T.D. 9636) establish a framework for distinguishing repairs — deductible immediately — from improvements, which must be capitalized and depreciated.

The analysis begins by identifying the “unit of property” (UOP). For MHP utility systems, the IRS generally treats each utility system serving the property as a separate unit of property — not each individual component. That means a sewer system is analyzed as a whole when determining whether an expenditure is a repair or improvement.

Under the tangible property regs, an expenditure is a capital improvement if it:

• Betters the unit of property (adds value, increases capacity, corrects a material condition defect)
• Restores the unit of property (replaces a major component, returns the property to working condition after a casualty)
• Adapts the unit of property to a new or different use

Conversely, routine maintenance — patching roads, snaking sewer lines, replacing a failed pump under a maintenance contract — is generally a repair expense, deductible in the year paid.

Bonus Depreciation for MHP Infrastructure

One of the most powerful tools for MHP owners is bonus depreciation under IRC §168(k). Fifteen-year land improvements qualify for bonus depreciation — meaning you can deduct a large percentage of the infrastructure cost in the year it’s placed in service, rather than spreading it over 15 years.

The bonus depreciation percentage has been phased down from 100% (for property placed in service before January 1, 2023) and continues to phase down under current law. The applicable percentage for your acquisition or improvement year depends on when the asset is placed in service — verify the current rate with a tax professional, as this is subject to legislative change.

What this means practically: significant infrastructure rehabilitation projects — a full road overlay, sewer line replacement, electrical system upgrade — may generate enough depreciation in the year of completion to dramatically reduce or eliminate taxable income from the park for that year.

Cost Segregation: The Tool That Unlocks Infrastructure Depreciation

A cost segregation study is an engineering-based tax analysis that identifies and values each component of your MHP infrastructure, assigns the appropriate MACRS class life, and maximizes front-loaded depreciation.

Without cost segregation, most MHP owners — and most generic tax preparers — lump infrastructure into a single 15-year land improvement category. That’s already better than 27.5-year or 39-year treatment, but it still misses the opportunity to identify equipment components within each utility system that qualify for 5-year or 7-year treatment.

A cost segregation study also produces a component-level depreciation schedule that makes partial asset dispositions easy to track. When you replace a section of water main, you can write off the remaining basis of the retired component — a deduction that’s impossible to claim without component-level records.

See our related guide on tax strategy for buying your first MHP for guidance on timing a cost segregation study relative to your acquisition.

Aging Infrastructure and Exit Planning

Deferred infrastructure maintenance is the single most common reason MHP transactions fall apart or close at a lower price than expected. Buyers and their lenders apply a dollar-for-dollar reduction (or worse — a cap rate adjustment) for every dollar of deferred maintenance they identify in due diligence.

A park with $300,000 in required water system upgrades doesn’t just lose $300,000 in sale price — it loses $300,000 divided by the cap rate. At a 7% cap rate, that’s a $4.3 million reduction in value. Buyers price in the risk premium on top of the remediation cost.

From a tax perspective, addressing infrastructure before sale has a benefit: you can deduct or accelerate depreciation on the improvement, reducing your taxable income during the hold period. That’s a better outcome than taking a dollar-for-dollar purchase price reduction without any tax offset.

For more on how depreciation integrates with your overall MHP tax strategy, see our guide on Section 179 deductions for MHP owners and our overview of tax considerations for MHP development.

For authoritative guidance on MACRS class lives, see IRS Publication 946: How to Depreciate Property.

Disclaimer: This content is provided for general educational purposes only and does not constitute tax, legal, or financial advice. Tax laws change frequently and individual circumstances vary. Consult a qualified tax professional before making any decisions based on this information. The MHP Accountant® provides tax services — not legal advice.