IRC 471(c) Explained: Methods, UNICAP Exemption, and Eligibility

Internal Revenue Code Section 471(c) lets a qualifying small business skip the standard inventory accounting rules and use a simpler approach that tracks how it already keeps its books. For tax years beginning in 2026, a business with average annual gross receipts of $32 million or less over the prior three years qualifies, and it can choose between two simplified methods: treating inventory as non-incidental materials and supplies, or following the inventory method used on its financial statements or in its books and records.¹

Who Qualifies

Eligibility runs through the gross receipts test in Section 448(c). A business passes if the average of its gross receipts over the three tax years immediately before the current year does not exceed an inflation-adjusted ceiling. That ceiling is $32 million for tax years beginning in 2026.¹

A few wrinkles matter. A business that has existed for fewer than three years averages only the years it has been around. Aggregation rules apply as well: entities treated as a single employer under the controlled-group and affiliated-service-group rules must combine their gross receipts. A cluster of related businesses that each fall below $32 million but together exceed it will not qualify. Sole proprietors and other non-corporate, non-partnership taxpayers apply the test as if each separate trade or business were its own entity.²

One category is locked out no matter how small: tax shelters. For this purpose, a tax shelter includes any entity other than a C corporation where more than 35 percent of losses are allocated to owners who do not actively participate in management.³

The Two Simplified Methods

A qualifying business picks one of two methods. Both replace the standard Section 471(a) requirement to value inventory under detailed tax rules.² Which one fits depends on how the business keeps its books and how aggressive it wants to be about pulling costs into the current year.

Non-Incidental Materials and Supplies

Under the NIMS method, inventory is treated as non-incidental materials and supplies. Costs are recovered through cost of goods sold in the later of two periods: the year the inventory is used or consumed, which for a retailer or wholesaler means the year it is delivered to a customer, or the year the cost is paid or incurred.⁴ Raw materials sitting in a warehouse at year-end stay out of cost of goods sold until they are actually put to use, even if the invoice has already been paid.

NIMS is the more aggressive simplification. It limits capitalizable inventory costs to direct material costs for manufacturers and the acquisition cost for resellers. Direct labor and all indirect costs stay out of inventory entirely.⁵ A manufacturer using NIMS deducts labor and overhead in the year those costs are paid or incurred, instead of loading them into inventory to be deducted later when goods sell. For a business with heavy labor or overhead relative to material costs, the timing benefit can be significant.

Financial Statement or Books-and-Records Method

The alternative lets a business follow whatever inventory accounting method appears on its applicable financial statement. An AFS, defined by cross-reference to Section 451(b)(3), generally means a financial statement filed with a government agency (such as a 10-K filed with the SEC), a statement audited by an independent CPA under GAAP, or one provided to creditors to obtain a loan.²

No AFS? A business can still use this approach by following the inventory method reflected in its books and records, so long as those records are kept under its own accounting procedures. The regulations recognize several sources: a point-of-sale system that tracks acquisition costs and inventory levels, physical counts reconciled with that system, internal reports to shareholders, even representations made to a creditor about the cost of inventory on hand.⁴ The main constraint is that inventory costs cannot be recovered for tax purposes until they have been paid or incurred under the taxpayer’s overall method of accounting.

This method typically capitalizes more costs to inventory than NIMS does, because financial-statement accounting often includes labor and overhead in inventory. The tradeoff is fewer book-to-tax differences to track, because the tax return mirrors the financials.

Exemption from UNICAP

A qualifying small business also escapes the Uniform Capitalization rules under Section 263A. UNICAP normally forces businesses to capitalize a share of indirect costs, including rent, utilities, depreciation, purchasing overhead, and indirect labor, into inventory or self-constructed assets. A business meeting the Section 448(c) gross receipts test is exempt from these capitalization requirements for both inventory and self-constructed assets.⁶

One boundary is worth flagging. The UNICAP exemption removes Section 263A from the picture, but other capitalization provisions still apply. Section 263(a), for example, independently requires capitalizing costs that create or improve a distinct asset. A small business building a warehouse will still capitalize the construction costs, because that obligation comes from a different part of the code.⁶

How to Adopt a Section 471(c) Method

Switching to a Section 471(c) inventory method is a change in accounting method and requires filing Form 3115, Application for Change in Accounting Method.⁷ These changes qualify for automatic consent, so there is no user fee and no wait for a private letter ruling. Rev. Proc. 2024-23 lists the designated change numbers in Section 22:⁸

DCN 260 for a change to the NIMS inventory method
DCN 261 for a change to the AFS or non-AFS inventory method
DCN 262 for a change from one Section 471(c) method to another
DCN 263 for a change from a Section 471(c) method back to a standard Section 471(a) method

The original Form 3115 gets attached to the timely-filed federal income tax return, including extensions, for the year of the change. A signed copy goes to the IRS National Office no later than the date the original is filed with the return.⁹ Miss the deadline and automatic consent for that year is gone.

The Section 481(a) Adjustment

A change under Section 471(c) is treated as initiated by the taxpayer with the consent of the IRS,² and it triggers a Section 481(a) adjustment. That one-time correction prevents income from being counted twice or skipped entirely during the transition. The direction of the adjustment controls how fast it hits taxable income. A negative adjustment, which reduces taxable income, is taken entirely in the year of change. A positive adjustment, which increases taxable income, is spread ratably over the year of change and the following three tax years.¹⁰

Businesses switching to NIMS often see a negative adjustment, because previously capitalized labor and overhead come out of inventory and drop into current-year deductions. If the positive adjustment is less than $50,000, the taxpayer can elect to recognize the entire amount in the year of change rather than spreading it over four years.¹⁰

Losing Eligibility

Growth ends the party. A business that qualified at $30 million in average receipts can lose eligibility after a strong year pushes its three-year average above $32 million. When that happens, the business must change back to a standard inventory method under Section 471(a). Rev. Proc. 2024-23 provides DCN 263 for that transition, and it is also an automatic change.⁸

The change back is not optional. A business that no longer meets the gross receipts test but keeps using Section 471(c) is using an impermissible method. The three-year lookback does smooth out temporary spikes: a single high-revenue year will not disqualify a business whose other two lookback years are low enough to keep the average under the threshold. Watch the rolling average well before filing season.

Compliance Risks

The most common mistake is claiming Section 471(c) while failing the gross receipts test, either because related entities were not properly aggregated or because the business is a tax shelter. If the IRS finds that a taxpayer used a simplified method without qualifying, the underpayment triggers the standard accuracy-related penalty of 20 percent for negligence or a substantial understatement of income tax, with interest running from the original due date.¹¹

Recordkeeping matters too. NIMS is simpler than traditional inventory accounting, but it still requires tracking when materials are used or consumed and when costs are paid. The AFS or books-and-records method requires the business to actually maintain the financial statements or books it claims to be conforming to. Picking the books-and-records route without consistent internal accounting procedures builds a tax position on a shaky foundation, and the IRS expects the method to reflect genuine accounting practice rather than a number reverse-engineered to minimize tax.

1
Internal Revenue Service. Rev. Proc. 2025-32 – Inflation-Adjusted Items for 2026
2
Office of the Law Revision Counsel. 26 USC 471 – General Rule for Inventories
3
Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting
4
eCFR. 26 CFR 1.471-1 – Need for Inventories
5
eCFR. 26 CFR Part 1 – Inventories – Section 1.471-1(b)(4)(ii)
6
Federal Register. Small Business Taxpayer Exceptions Under Sections 263A, 448, 460, and 471
7
Internal Revenue Service. About Form 3115, Application for Change in Accounting Method
8
Internal Revenue Service. Rev. Proc. 2024-23 – Changes in Accounting Periods and Methods of Accounting
9
Internal Revenue Service. Instructions for Form 3115 (Rev. December 2022)
10
Internal Revenue Service. IRM 4.11.6 – Changes in Accounting Methods
11
Internal Revenue Service. Accuracy-Related Penalty