Section 471 Costs: Inventory Capitalization and UNICAP Rules

Section 471 costs are the direct materials and direct labor that a business producing, purchasing, or selling merchandise must capitalize into inventory rather than deduct in the year it spends the money. They sit on the balance sheet until the related goods are sold, at which point they flow into Cost of Goods Sold and reduce taxable income. For most product-based businesses, Section 471 costs are only the starting point: Section 263A then requires an allocable share of indirect overhead to ride along with those direct costs. Businesses averaging $32 million or less in gross receipts for tax years beginning in 2026 can skip most of this and use a simplified method instead.¹

What Section 471 Costs Actually Are

Section 471 of the Internal Revenue Code requires inventory accounting whenever the production, purchase, or sale of merchandise is a factor in determining income.² The method used has to conform to best accounting practice in the industry and clearly reflect income. You can’t pick a method that front-loads deductions.

Under that rule, two categories of cost form the baseline inventory pool that every affected manufacturer and reseller must capitalize:

Direct material costs
Direct labor costs, together with the employment-related burden on those wages

These are what practitioners typically mean when they say “Section 471 costs.” They are the floor. Section 263A can add to them, but nothing removes them.

Direct Materials

Direct materials are the physical inputs that become part of the finished product: raw materials, purchased components, and subassemblies. Freight charges to move those materials to your facility ride along with them. A furniture manufacturer’s lumber and hardware, plus the shipping invoice from the supplier, all land in inventory as direct material costs.

Direct Labor

Direct labor is the wages paid to employees who physically work on the product. In a food plant, that’s the production-line workers, not the front office. Direct labor also picks up the related burden tied to those employees: your share of payroll taxes, workers’ compensation premiums, and employer-paid health benefits. Those burden costs travel with the wages they relate to and get capitalized alongside them.³

How These Costs Move Through Cost of Goods Sold

Capitalization is a timing rule. When you buy $100,000 in raw materials in December but don’t sell the finished goods until March of the following year, that $100,000 sits in ending inventory at year-end. It doesn’t reduce this year’s income; it reduces next year’s, when the goods are sold.

The Cost of Goods Sold calculation is straightforward. You start with beginning inventory, add everything spent to produce or purchase goods during the year, then subtract ending inventory. Whatever remains is the cost attributable to the goods you actually sold. Corporations and partnerships report those components on Form 1125-A, which lays out beginning inventory, purchases, labor, additional Section 263A costs, and ending inventory as separate line items.⁴

The higher your ending inventory, the lower your current-year deduction and the higher your taxable income. That is why identifying the right pool of capitalizable costs matters. Sweeping too much in delays deductions; leaving too much out understates taxable income and invites penalties.

How Section 263A Adds to the Section 471 Base

Section 263A, the Uniform Capitalization Rules or UNICAP, expands the pool beyond direct costs.⁵ The premise is that overhead like factory rent and equipment depreciation contributes to making the product just as materially as the raw materials do, so a share of that overhead should travel with the inventory. On Form 1125-A, these show up on the “additional Section 263A costs” line, separate from the direct Section 471 costs.

Producers

If you manufacture or otherwise produce property, you capitalize all direct costs plus an allocable share of indirect costs that benefit production. The indirect costs most commonly pulled in include factory rent and utilities, depreciation on manufacturing equipment, insurance on the production facility, quality control, and repairs to production machinery.⁶

Indirect labor is another significant category. Supervisors on the production floor, factory administrative staff, and maintenance crews all generate costs that benefit production. Even officer and owner compensation must be partially capitalized when those individuals are involved in day-to-day production.⁷ Support functions like accounting or IT generate what the IRS calls mixed service costs, which get split between capitalizable production support and deductible non-production activities.

Resellers

Retailers and wholesalers face a narrower version of UNICAP. They have no production costs, but they do capitalize the acquisition cost of goods purchased for resale along with indirect costs related to purchasing, handling, and storage.⁸ Warehousing expenses, freight from supplier to warehouse, and the costs of a purchasing department all fall into this bucket.

Allocating the Indirect Layer

Once you know which indirect costs must be capitalized, you need a method to determine how much of them belongs in ending inventory. Manufacturers commonly use the simplified production method, which computes a single absorption ratio: total additional Section 263A costs incurred during the year divided by total Section 471 costs (direct materials and direct labor) incurred during the year. Multiply that ratio by the Section 471 costs sitting in ending inventory and you get the additional indirect cost to capitalize. If your ratio comes out to 15% and you have $500,000 of direct costs in ending inventory, you capitalize an additional $75,000. Resellers that don’t also produce goods can elect a parallel simplified resale method built on purchasing, handling, and storage costs.⁸

Costs That Stay Outside the Inventory Pool

Not everything gets swept into inventory, even under UNICAP’s broad reach. Several categories are deductible currently regardless of production or purchasing activity:

Selling and distribution costs, including marketing, advertising, sales commissions, and shipping to deliver finished goods to customers⁶
Research and experimental expenditures that qualify under Section 174. Since 2022, Section 174 costs must be amortized over five years for domestic research and fifteen years for foreign research rather than deducted immediately, but they still fall outside UNICAP.⁵
Overall management and policy costs, including internal audit, shareholder relations, and corporate governance functions

A useful working rule: if the cost helps create or acquire the product, capitalize it; if the cost helps sell or deliver it once finished, deduct it.

The Small Business Escape from These Rules

Section 471(c) exempts qualifying small businesses from both the traditional inventory rules and UNICAP. For tax years beginning in 2026, you qualify if your average annual gross receipts over the three preceding tax years do not exceed $32 million.¹ Tax shelters are excluded regardless of size.²

The test is rolling. You recalculate every year against the three most recent prior years. If your business hasn’t existed for the full three-year lookback, you use the period during which it did exist, annualizing any short year by multiplying gross receipts by twelve and dividing by the number of months in that short year.⁹

Businesses under common control cannot each claim the exemption independently. The gross receipts of all entities treated as a single employer under the controlled group and affiliated service group rules get combined before testing against the threshold.⁹ An owner running three related businesses that each average $15 million is well over the line once the receipts are aggregated.

Qualifying small businesses have two alternatives to traditional inventory accounting. Under the non-incidental materials and supplies method, you treat inventory as materials and supplies and deduct costs only in the year the inventory is used or consumed. Only direct material costs get capitalized under this method, not direct labor. A baker using it capitalizes the cost of ingredients but deducts employee wages currently. This method may not be combined with LIFO.¹⁰³ The alternative is the financial statement method, which lets you follow whatever inventory method appears on your applicable financial statement, or on your internal books and records if you don’t have one.²

Either method eliminates the need to calculate and allocate UNICAP costs, which is where most of the compliance burden lives.

Changing How You Track Section 471 Costs

Adopting one of the small business inventory methods, or making any other change to your inventory accounting, requires filing Form 3115, Application for Change in Accounting Method.¹¹ Changes under Section 471(c) are treated as initiated by the taxpayer with the automatic consent of the IRS, so no advance permission is needed.

The trickiest part of switching is the Section 481(a) adjustment. When you change how you account for inventory, a gap usually exists between the old method and the new one. That gap gets converted into a single adjustment that either increases or decreases taxable income. A positive adjustment means the old method was deferring more income than the new one allows, so additional tax is owed. A negative adjustment means the opposite.

For voluntary changes made with automatic consent, the IRS generally spreads a positive adjustment ratably over four tax years: the year of change and the three following years. A negative adjustment is taken entirely in the year of change.¹² If the taxpayer is under examination, the positive adjustment period shortens to two years. Modeling the dollar impact before filing is essential.

What Happens If You Get It Wrong

Expensing costs that should have been capitalized to inventory understates tax liability, and the IRS imposes a 20% accuracy-related penalty on the resulting underpayment when it qualifies as a substantial understatement of income tax. For individuals, an understatement is substantial if it exceeds the greater of 10% of the correct tax or $5,000. For C corporations, the threshold is the lesser of 10% of the correct tax (or $10,000 if greater) and $10 million.¹³

A separate valuation misstatement penalty applies when the value or adjusted basis of property on the return is 150% or more of the correct amount, provided the underpayment attributable to the misstatement exceeds $5,000 ($10,000 for C corporations). The rate is the same 20%, but it can stack with other accuracy-related penalties on the same return.

Beyond formal penalties, IRS auditors are trained to look for specific inventory red flags. Gross profit percentages that deviate sharply from industry norms or from a taxpayer’s own prior years are a common trigger. So is reporting no inventory on the return when the business clearly deals in physical goods, or using a valuation method that doesn’t conform to accepted practices. The strongest protection is a well-documented inventory method applied consistently, with records that connect every capitalized cost to the goods it relates to.

1
Internal Revenue Service. Revenue Procedure 2025-32 – Inflation-Adjusted Items for 2026
2
Office of the Law Revision Counsel. 26 U.S.C. 471 – General Rule for Inventories
3
eCFR. 26 CFR 1.471-1 – Need for Inventories
4
Internal Revenue Service. Form 1125-A Cost of Goods Sold
5
Office of the Law Revision Counsel. 26 U.S.C. 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses
6
eCFR. 26 CFR 1.263A-1 – Uniform Capitalization of Costs
7
Internal Revenue Service. Producer’s 263A Computation
8
eCFR. 26 CFR 1.263A-3 – Rules Relating to Property Acquired for Resale
9
Office of the Law Revision Counsel. 26 U.S.C. 448 – Limitation on Use of Cash Method of Accounting
10
eCFR. 26 CFR 1.162-3 – Materials and Supplies
11
Internal Revenue Service. About Form 3115 – Application for Change in Accounting Method
12
Internal Revenue Service. Instructions for Form 3115 – Application for Change in Accounting Method
13
Office of the Law Revision Counsel. 26 U.S.C. 6662 – Imposition of Accuracy-Related Penalty on Underpayments