Section 471 Costs: Inventory Rules and Small Business Exemption

Section 471 costs are the inventory costs that the Internal Revenue Code requires product-based businesses to capitalize instead of deducting right away. At a minimum, that means direct materials and direct labor: the stuff that becomes the product and the wages of the people who make it. Those costs sit on your balance sheet as inventory until the goods are sold, at which point they flow into Cost of Goods Sold and reduce taxable income. Section 263A (UNICAP) usually layers an allocable share of indirect overhead on top of that baseline, though businesses averaging $32 million or less in gross receipts for 2026 can skip most of the complexity entirely.

What Counts as a Section 471 Cost

Section 471 of the Internal Revenue Code requires inventory accounting whenever producing, purchasing, or selling merchandise is a factor in determining your income.¹ The method you use has to conform to best accounting practices in your industry and clearly reflect income. Within that framework, two categories of direct cost form the mandatory baseline every manufacturer and reseller has to capitalize.

Direct Materials

Direct material costs cover everything that becomes part of the finished product. Raw materials, purchased components, and subassemblies all qualify, as do the freight charges to get those materials to your facility. A furniture manufacturer that buys lumber and hardware capitalizes the invoice price plus inbound shipping. The cost rides with the product until it sells.

Direct Labor

Direct labor is the wages you pay employees who physically work on the product. For a food manufacturer, that means the workers running production lines, not the front-office staff. Direct labor also pulls in the related burden costs tied to those employees: your share of payroll taxes, workers’ compensation premiums, and employer-paid health benefits. Those burden costs travel with the labor they relate to and get capitalized alongside it.²

Together these two categories make up what the IRS calls “Section 471 costs.” They are the floor. For most businesses outside the small taxpayer exemption, Section 263A then adds a share of indirect costs on top.

How These Costs Reach Your Tax Return

Capitalization delays your deduction until you sell the product. Buy $100,000 of raw materials in December but don’t sell the finished goods until March, and that $100,000 sits in year-end inventory rather than reducing current-year income. Timing is the whole game, because inventory accounting directly controls Cost of Goods Sold, which is the single biggest deduction most product-based businesses take.

The Cost of Goods Sold formula is simple arithmetic: beginning inventory, plus everything you spent to produce or purchase goods during the year, minus ending inventory. Whatever remains is the cost attributable to goods you actually sold. Corporations and partnerships report the components on Form 1125-A, which breaks out beginning inventory, purchases, labor, additional Section 263A costs, and ending inventory as separate line items.³ The higher your ending inventory, the lower your current-year deduction and the higher your taxable income.

Where Section 471 Ends and Section 263A Begins

Section 263A, usually called the Uniform Capitalization Rules or UNICAP, expands the pool of costs you have to fold into inventory. It requires an allocable share of indirect expenses that benefit production or purchasing to be capitalized alongside the direct costs.⁴ The reasoning is that factory rent and equipment depreciation help create the product just as surely as raw materials do, so a portion of those costs should travel with inventory.

Producers

If you manufacture or otherwise produce property, you capitalize all direct costs plus indirect costs allocable to production. The indirect costs commonly pulled in include factory rent and utilities, depreciation on manufacturing equipment, insurance on the production facility, quality control, and repairs to production machinery.⁵

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 has to be partially capitalized when those individuals are involved in day-to-day production activities.⁶ Support functions like accounting or IT create 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 don’t have production costs, but they do capitalize the acquisition cost of goods purchased for resale along with indirect costs related to purchasing, handling, and storage.⁷ Warehousing expenses, freight from supplier to warehouse, and the costs of your purchasing department all land in this bucket. A retailer that employs buyers, runs distribution centers, and pays for warehousing insurance capitalizes a portion of all of it.

Costs That Stay Out of Inventory

Not everything gets swept in, even under UNICAP. Several categories of cost remain currently deductible regardless of your production or purchasing activities.

Selling and distribution costs. Marketing, advertising, sales commissions, and shipping finished goods out to customers are deductible in the year incurred.⁵
Research and experimental expenditures. Amounts qualifying under Section 174 are excluded from UNICAP. 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 the inventory rules.⁴
Overall management and policy costs. Expenses from departments handling functions like internal audit, shareholder relations, or corporate governance are generally deductible rather than capitalizable.

The line that trips people up: if the cost helps create or acquire the product, capitalize it; if the cost helps sell or deliver the product after it’s finished, deduct it.

The Small Business Exemption

Most of this complexity falls away for small taxpayers. Section 471(c) exempts qualifying businesses from both the traditional inventory accounting rules and the UNICAP requirements of Section 263A. If you clear the exemption, you can stop allocating overhead to inventory and use a far simpler method.

The Gross Receipts Test

You qualify if your average annual gross receipts over the three preceding tax years do not exceed the inflation-adjusted threshold, which is $32 million for tax years beginning in 2026.⁸ Tax shelters are excluded regardless of size.¹

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

Aggregation

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

The Two Simplified Options

A qualifying small business has two alternatives to traditional inventory accounting. The first is to treat inventory as non-incidental materials and supplies (NIMS), deducting costs only in the year the inventory is used or consumed in the business. Under NIMS, you only need to capitalize direct material costs, not direct labor. A baker using NIMS capitalizes the cost of flour and sugar but can deduct employee wages as a current expense. NIMS users may not use LIFO.¹⁰²

The second option is the financial statement method. You follow whatever inventory method appears on your applicable financial statement (an audited statement, a filed SEC statement, or similar). If you don’t have an applicable financial statement, you use your internal books and records.¹ Either method eliminates the need to calculate and allocate UNICAP costs, which is where most of the compliance burden lives.

Switching Methods

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 you don’t need to request permission in advance.

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

For voluntary changes made with automatic consent, the IRS generally requires you to spread 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 you’re under examination, the positive adjustment period shortens to two years. These rules prevent a one-time income spike from making the switch prohibitively expensive, but you should model the dollar impact before filing.

What Happens If You Get It Wrong

Expensing costs that should have been capitalized to inventory understates your 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 that’s larger) and $10 million.¹³

A separate valuation misstatement penalty applies when the value or adjusted basis of property on your 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 penalty rate is the same 20%, and it can stack with other accuracy-related penalties on the same return.

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

1
Office of the Law Revision Counsel. 26 U.S.C. 471 – General Rule for Inventories
2
eCFR. 26 CFR 1.471-1 – Need for Inventories
3
Internal Revenue Service. Form 1125-A Cost of Goods Sold
4
Office of the Law Revision Counsel. 26 U.S.C. 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses
5
eCFR. 26 CFR 1.263A-1 – Uniform Capitalization of Costs
6
Internal Revenue Service. Producer’s 263A Computation
7
eCFR. 26 CFR 1.263A-3 – Rules Relating to Property Acquired for Resale
8
Internal Revenue Service. Revenue Procedure 2025-32 – Inflation-Adjusted Items for 2026
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