Section 263A Regulations: Who Must Capitalize and Which Costs

Section 263A of the Internal Revenue Code, commonly called the UNICAP rules, requires businesses that produce property or acquire property for resale to capitalize direct costs and an allocable share of indirect costs into inventory or asset basis rather than deducting them immediately. The tax benefit of those costs is deferred until the inventory is sold or the asset is depreciated. For tax years beginning in 2026, a business is subject to the Section 263A UNICAP rules only if its average annual gross receipts over the three preceding tax years exceed $32,000,000.¹

Who the Rules Apply To

UNICAP reaches any taxpayer that produces real property or tangible personal property, or that acquires tangible personal property for resale. “Produce” is defined broadly to include manufacturing, constructing, building, installing, developing, or improving an asset. A custom equipment maker, a general contractor building an office tower, and a retailer buying finished goods from a wholesaler all fall within the statute.²

What happens to the capitalized costs afterward depends on the property. Costs added to inventory flow through cost of goods sold when the inventory is sold. Costs added to a self-use asset, like a building a company constructs for its own operations, are recovered through depreciation over the asset’s recovery period.

Intangibles are largely outside the rule, with an important carveat. Section 263A does not apply to costs of producing intangible assets such as loans, securities, stock, debt instruments, or mortgages. It does apply to certain creative property that will be mass-distributed in tangible form, including books, motion pictures, and sound recordings, and to the costs an author incurs researching and writing a manuscript.³ Incidental items produced as part of a service engagement, such as a blueprint an architect delivers to a client, are excluded.

The Small Business Exemption

The most consequential exception is the small business taxpayer exemption. A business that averages $32,000,000 or less in gross receipts over the three preceding tax years is exempt from the UNICAP rules for tax years beginning in 2026.¹ The threshold is adjusted annually for inflation; it was $31,000,000 for 2025.⁴

Gross receipts are defined broadly for this test. They include total sales, services income, investment income, and any other amounts received from all of the taxpayer’s trades or businesses. Related entities under common control must aggregate their receipts, so a corporate group cannot split into smaller pieces to slip under the threshold.

A qualifying business is relieved of capitalizing indirect costs for produced and acquired property. It is also exempted from the percentage-of-completion method under Section 460 for certain construction contracts and from the inventory requirements of Section 471.⁵ In practical terms, the small business gets to deduct costs that a larger competitor must capitalize and wait to recover.

Farming, Timber, and Research Carve-Outs

Congress also excluded specific activities regardless of size. UNICAP does not apply to the costs of raising any animal in a farming business, and it does not apply to plants with a preproductive period of two years or less, which covers most annual crops.²

Farmers growing plants with longer preproductive periods, such as orchards and vineyards, can elect out of UNICAP for all plants they produce. The election is available only to taxpayers not required to use the accrual method under Section 447 or 448(a)(3), which shuts out most corporations, partnerships with corporate partners, and tax shelters. A farmer who elects out must accept the alternative depreciation system, generally longer recovery periods with straight-line depreciation, for all farm assets placed in service during years the election is in effect.

Timber has its own exclusion. Trees the taxpayer raises, harvests, or grows (other than certain ornamental trees), together with the underlying real property, sit outside Section 263A. Research and experimental expenditures deductible under Section 174 are also excluded from UNICAP, which prevents overlap with the research deduction.

Costs Producers Must Capitalize

A producer must capitalize direct costs and an allocable share of indirect costs. Direct costs are the raw materials that become part of the finished product and the labor of the workers who physically make it. Indirect costs are expenses that benefit or support production without being direct materials or labor. The main categories:

Factory overhead, including rent, utilities, depreciation, insurance, and maintenance for production facilities.
Indirect labor, including supervisors, quality control inspectors, and other production-support staff.
Officer compensation to the extent allocable to production, including related payroll taxes and benefits. The IRS looks at what an officer actually does, not their title, so a company president who spends half the week on the factory floor must capitalize half of their compensation.⁶
Employee benefits for production personnel, including pension contributions, profit-sharing, and health insurance.
Engineering and design costs for the product or the production process.
Allocable portions of accounting, human resources, legal, and IT departments to the extent they support production.

Self-Constructed Assets

When a business builds an asset for its own use, such as a warehouse or specialized equipment, the same capitalization rules apply. Direct and allocable indirect costs go into the asset’s basis and are recovered through depreciation rather than cost of goods sold.⁷

Interest Capitalization

Interest expense receives special treatment. A taxpayer must capitalize interest when it produces property in one of three categories: real property produced by the taxpayer, tangible personal property with an estimated production period exceeding two years, or tangible personal property with an estimated production period exceeding one year and estimated production cost exceeding $1,000,000. The production period ends when the property is placed in service or is ready to be held for sale, and for products that must age (like wine or whiskey) it runs through the entire aging process.⁸

Costs Resellers Must Capitalize

Retailers, wholesalers, and other resellers capitalize the purchase price of inventory and certain indirect costs of acquiring, storing, and handling that inventory. The additional costs are allocated to property on hand at year-end. The capitalizable categories include:

Purchasing costs, including wages of purchasing agents and related support staff.
Off-site storage and warehousing costs, including rent, depreciation, utilities, insurance, security, and maintenance for storage facilities not physically attached to a retail location.⁹
Handling costs for processing, assembly, repackaging, and moving inventory between facilities.

Not every handling cost is capitalized. Handling costs at a retail sales facility for products sold to customers at that facility, such as unloading, unpacking, marking, and tagging goods in a store, remain immediately deductible. Pick-and-pack activity inside a warehouse is also exempt when performed in preparation for imminent shipment to a customer who has already ordered.¹⁰

Costs Excluded from Capitalization

Several categories of expenses stay fully deductible even for taxpayers subject to UNICAP:

Selling, marketing, advertising, and distribution costs.
Research and experimental expenditures qualifying under Section 174.
State, local, and foreign income taxes, and franchise taxes assessed on income.
Amounts elected for immediate expensing under Section 179.
Warranty and product liability costs for products already sold, and product liability insurance premiums.
Storage costs at a facility physically attached to and part of a retail sales location.
Depreciation on equipment and facilities that have been placed in service but are temporarily idle.
Costs of hiring replacement workers, security, and legal fees related to a strike (the replacement workers’ wages themselves are not automatically exempt).
Costs of soliciting contracts the taxpayer did not win.

Certain general overhead departments are also treated as deductible service costs so long as they do not predominantly benefit a specific production or resale activity. These include strategic business planning, general financial accounting, tax services, shareholder relations, internal audit, personnel policy, and overall executive management.¹¹

Calculating the Capitalized Amount

Tracing every indirect cost to specific inventory items is impractical for most businesses, so the Treasury Regulations provide simplified formula-based methods.

Under the simplified production method, a producer calculates an absorption ratio by dividing additional Section 263A costs incurred during the year by total Section 471 costs incurred during the year. Section 471 costs are the costs the business already includes in inventory under its normal accounting; additional Section 263A costs are the indirect costs the tax rules add on top. The ratio is applied to Section 471 costs in ending inventory to determine the extra amount that must be capitalized. A manufacturer with a 12 percent absorption ratio and $500,000 of Section 471 costs in ending inventory would capitalize an additional $60,000.⁶

Resellers use a parallel simplified resale method. A combined absorption ratio is applied to Section 471 costs of eligible property on hand at year-end, and the result is added to ending inventory for tax purposes.¹⁰

Both simplified methods allow an election to use a historic absorption ratio instead of recalculating each year. Entry is limited: a taxpayer must have used the simplified method and computed an actual ratio for at least three consecutive years before electing. Once elected, the historic ratio applies for a five-year qualifying period, after which the taxpayer tests it against a fresh actual calculation and either extends or reverts.¹²

Switching Into or Out of UNICAP

Starting to apply UNICAP, dropping it after qualifying for the small business exemption, or switching between calculation methods each counts as a change in accounting method. The taxpayer files Form 3115 (Application for Change in Accounting Method) to make the transition.¹³

Many Section 263A changes qualify as automatic changes, which means no user fee and no advance IRS approval. Form 3115 is filed with a timely filed return for the year of change, with a copy sent to the IRS National Office. Non-automatic changes require a user fee and a letter ruling before the change takes effect.

Any method change triggers a Section 481(a) adjustment, which is the cumulative difference between inventory or asset basis under the old method and the new method. For inventory, the adjustment equals the difference between revalued inventory under the new method and inventory as originally stated. Positive adjustments may be spread over multiple years under applicable IRS procedures.¹⁴

A frequent mistake is worth flagging. A business that should have been applying Section 263A but never did cannot simply start capitalizing costs going forward. It must file Form 3115 and compute the full Section 481(a) adjustment for all prior years of noncompliance. Quietly switching without the form is itself an improper method change.

Common Errors and Penalty Exposure

IRS examination guides call out several recurring UNICAP problems:

Classifying personnel by job title rather than actual function. An officer who spends significant time on production must have a proportionate share of compensation capitalized regardless of title.⁶
Mishandling storage costs. Off-site storage is capitalized; on-site retail storage is not. Facilities that serve both functions require careful allocation.⁹
Mixing cost pools. Purchasing, storage, and handling costs must be tracked separately from mixed service costs, and all costs in a mixed service department must be included when the simplified service cost method is used.
Failing to reconcile the adjustment on the return. Examiners check whether the Section 263A adjustment reported on Form 1125-A matches the taxpayer’s workpapers and Schedule M-3 entries.

UNICAP errors that understate tax expose the business to the accuracy-related penalty, which is 20 percent of the underpayment attributable to negligence, disregard of the rules, or a substantial understatement of income tax. Interest accrues on both the additional tax and the penalty from the original due date of the return. The IRS may waive the penalty for reasonable cause and good faith, but interest keeps running until the full liability is paid.¹⁵

1
Internal Revenue Service. Rev. Proc. 2025-32
2
Office of the Law Revision Counsel. 26 USC 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses
3
eCFR. 26 CFR 1.263A-2 – Rules Relating to Property Produced by the Taxpayer
4
Internal Revenue Service. Rev. Proc. 2024-40
5
Federal Register. Small Business Taxpayer Exceptions Under Sections 263A, 448, 460, and 471
6
Internal Revenue Service. Producer’s 263A Computation
7
Office of the Law Revision Counsel. 26 USC 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses
8
eCFR. 26 CFR 1.263A-12 – Production Period
9
Internal Revenue Service. Examining a Reseller’s IRC 263A Computation
10
eCFR. 26 CFR 1.263A-3 – Rules Relating to Property Acquired for Resale
11
eCFR. 26 CFR 1.263A-1 – Uniform Capitalization of Costs
12
eCFR. 26 CFR 1.263A-2 – Rules Relating to Property Produced by the Taxpayer
13
Internal Revenue Service. Instructions for Form 3115 – Application for Change in Accounting Method
14
eCFR. 26 CFR 1.263A-7 – Changing a Method of Accounting Under Section 263A
15
Internal Revenue Service. Accuracy-Related Penalty