Cost Segregation for New Construction: When Should You Start?

Most buildings are depreciated over a long recovery period for federal income tax purposes. A cost segregation study examines the project in detail and identifies assets that may qualify for shorter recovery periods. Depending on the property, these assets can include certain flooring, specialty electrical systems, removable finishes, equipment connections, landscaping, parking improvements, and other components.

Moving eligible costs into shorter-lived categories can accelerate depreciation deductions. That does not change what you paid for the property. It changes when eligible costs may be deducted. The benefit is primarily about timing, which means its value depends on your income, tax position, ownership structure, and plans for the property.

New construction creates an especially good documentation opportunity. Plans, contractor invoices, change orders, equipment schedules, and cost reports may clearly show what was installed and how much it cost. If you wait several years, those records can become difficult to locate, and the people who understood the project may no longer be available.

Planning early does not necessarily mean completing the final study before the property is ready. In most cases, the final analysis needs the completed project costs and a confirmed placed-in-service date. Early planning simply helps ensure that the information needed for the study is preserved.

A useful time to start the conversation is during design, construction, or renovation. At this stage, the provider can explain which records will be valuable and identify areas where contractor billing may need more detail. This can be particularly helpful when a large construction contract groups many different systems into broad categories.

The detailed study is typically finalized after the building is placed in service and the final project costs are substantially known. For tax purposes, placed in service generally means the property is ready and available for its intended use. It is not always the same as the purchase date, certificate date, first rent payment, or final construction payment, so the facts should be reviewed carefully.

If the project spans more than one tax year or opens in phases, the timing can become more complicated. An apartment complex may have some buildings available for rent while others remain under construction. A hotel may open while exterior improvements are still being completed. Your tax professional and study provider should coordinate how each phase is treated.

Owners should avoid waiting until a return is nearly due before raising the issue. A careful study takes time, and the conclusions must flow correctly into the depreciation records and tax return. Starting the discussion earlier gives everyone time to resolve missing costs, unclear invoices, and placed-in-service questions.

Keep the final construction contract, detailed contractor pay applications, subcontractor invoices, change orders, architectural drawings, engineering plans, equipment schedules, and project cost reports. Photographs taken during construction can also be valuable because they show systems that may be hidden after walls, ceilings, and concrete are finished.

Preserve records for owner-purchased materials and equipment separately from the general contractor’s costs. Appliances, specialty lighting, security systems, decorative fixtures, signage, data wiring, kitchen equipment, and similar purchases may not appear in the main construction ledger. Their installation costs may also need to be identified.

Soft costs deserve attention as well. Architectural fees, engineering costs, permits, construction-period expenses, and contractor overhead may need to be allocated among building components. These costs cannot simply be ignored, and not every soft cost receives the same treatment. A well-supported allocation is stronger than a rough percentage applied without documentation.

Your accounting records should reconcile to the final project basis used on the tax return. If the study analyzes one total while the general ledger and fixed-asset schedule show another, the difference must be explained. Keeping a dedicated construction account or work-in-progress schedule can make this reconciliation much easier.

A cost segregation study generally divides project costs among land, land improvements, personal property, and the building structure. Land itself is not depreciable. The building and its structural components usually remain in a long recovery category, while qualifying site improvements and personal property may be depreciated over shorter periods.

Potential shorter-lived assets depend on how the property is designed and used. Examples may include certain decorative finishes, removable partitions, dedicated electrical service for equipment, specialized plumbing, cabinetry, millwork, carpeting, exterior lighting, fencing, sidewalks, and parking improvements. An item does not qualify merely because it appears on a list. Its function, attachment, and relationship to the building matter.

The property type can significantly affect the results. A restaurant may contain substantial kitchen infrastructure and specialty finishes. A medical facility may have equipment-related electrical and plumbing systems. An apartment property may include appliances, carpeting, landscaping, and common-area features. A warehouse with a basic shell may have fewer short-lived components unless it includes specialized tenant improvements or operating systems.

The land allocation, construction costs, and any tenant-improvement arrangements must also be handled correctly. If tenants paid for part of the work, or if a tenant improvement allowance was involved, ownership of the resulting assets may not be obvious. Those agreements should be reviewed rather than assuming every improvement belongs on the owner’s depreciation schedule.

Shorter recovery periods can increase depreciation deductions in the earlier years of ownership. Some qualifying assets may also be eligible for bonus depreciation, but the available percentage can change based on federal law and the year an asset is placed in service. State treatment may differ from federal treatment, so Montana owners and investors in other states should confirm the current rules before projecting savings.

A larger deduction does not automatically create an immediate tax benefit. Rental losses may be limited by passive activity rules, at-risk rules, basis limitations, or other provisions. Short-term rental treatment can also depend on the length of guest stays and the owner’s level of participation. These issues should be evaluated before using a large estimated deduction to make an investment decision.

Accelerated depreciation can also affect a future sale. Some deductions may be subject to depreciation recapture or other less favorable tax treatment when the property is sold. Cost segregation can still be beneficial, especially because receiving a deduction earlier may improve cash flow, but the potential exit consequences belong in the analysis.

The study must be integrated into an accurate fixed-asset schedule. Every classified component should have a cost, recovery period, method, and placed-in-service date. If the property is later renovated, partially demolished, refinanced, exchanged, or sold, detailed asset records make it easier to determine what happened to each component.

Cost segregation tends to receive the most attention on larger projects, but property cost is not the only factor. The amount of depreciable basis, type of improvements, expected holding period, current taxable income, ownership structure, and ability to use deductions all matter. A smaller improvement-heavy property may produce a stronger result than a larger building with few specialized components.

Ask for an initial feasibility review before committing to a full study. The review should estimate how much basis might move into shorter recovery categories and explain the assumptions behind that estimate. Be cautious with projections that focus only on the largest possible first-year deduction while ignoring loss limitations, state differences, recapture, or the owner’s actual tax position.

Your tax professional should be involved before the study is finalized. The provider may understand construction classification, while the tax professional understands your return, entity structure, passive activities, and longer-term plan. Coordination is especially important when multiple investors, partnerships, phased construction, or mixed personal and business use are involved.

Marlow Accounting provides cost segregation studies for residential and commercial real estate. We can also help coordinate the depreciation information with your broader tax planning. For a new project, the practical first step is to gather the construction budget, expected completion date, property type, ownership details, and a current estimate of land and building costs.

This article is general information and is not tax, legal, or accounting advice for your specific situation. Cost segregation results and the ability to use accelerated deductions depend on the property, current law, your tax return, and your plans for the investment.

To discuss your project, call Marlow Accounting at (406) 290-1214 or schedule a free consult. Cory Marlow is an IRS Enrolled Agent federally licensed by the U.S. Treasury and can help you evaluate the tax questions surrounding a proposed study.