IRC §263A — Uniform Capitalization (UNICAP)

Where this comes from

Before UNICAP, businesses could deduct some indirect costs related to construction immediately instead of adding them to the building's basis. That created a mismatch: the cost of the building was spread over decades, but some of the costs of building it were deducted right away.

Congress added Section 263A as part of the Tax Reform Act of 1986 to close that gap. The section requires that all costs allocable to producing or acquiring the property go into the basis, not into a current deduction. The idea is that the cost of the property includes all the costs required to get it into use, not just the obvious ones.

What it says

Section 263A applies to businesses that produce real or personal property or acquire property for resale. The required capitalization covers two layers. Direct costs are materials, direct labor, and other costs that go directly into the asset. Those have always been capitalized. Indirect costs include storage, certain purchasing overhead, and other costs that support the construction or acquisition but are not a direct input. Those must also be capitalized under this section.

Section 263A(f) adds the construction interest rule. If you are financing the construction of real property that has a production period of more than two years and a cost exceeding $1 million, the interest allocable to that construction must be capitalized. You cannot deduct it while you are building. It goes into the building's basis and is recovered through depreciation.

How it shows up in a study

A cost segregation study allocates your property's depreciable basis across asset classes. The bigger the basis, the more there is to allocate into the fast-write-off classes.

For a self-constructed building or a ground-up development project, the UNICAP costs, both indirect overhead and capitalized interest, can be meaningful. If those costs were expensed during construction instead of capitalized, the depreciable basis is understated. A study working from that number misses some of the benefit.

A good study will flag this issue if the starting basis looks inconsistent with what construction should have cost. Getting the basis right before running the study is part of the pre-study review for development projects.

What it does not mean

Section 263A typically does not affect the basis of a building you purchased from a third party. In that case, the purchase price is the basis, and UNICAP is not in the picture. The section matters for construction and development, not ordinary acquisitions.

It also does not create extra deductions. It moves costs from current deductions into the basis, where they are recovered more slowly over the life of the property. The capitalized costs do not disappear. They just flow through depreciation over time rather than in the year they were paid.