IRC 471(c) Explained: Methods, UNICAP Relief, and Adoption

Section 471(c) of the Internal Revenue Code gives qualifying small businesses a way out of the standard inventory accounting rules. If your business averaged $32 million or less in gross receipts over the prior three tax years (the ceiling for tax years beginning in 2026), you can either treat inventory as non-incidental materials and supplies or follow the inventory method you already use on your financial statements or internal books.¹ Both approaches replace the detailed valuation and cost-tracking that Section 471(a) otherwise requires.²

Who Qualifies

Eligibility runs through the gross receipts test in Section 448(c). The average of your gross receipts over the three tax years immediately before the current year must not exceed the inflation-adjusted ceiling, which is $32 million for tax years beginning in 2026.¹ The statutory base is $25 million, adjusted annually.³

A few wrinkles matter in practice. If your business has existed for fewer than three years, you average only the years it has been around. Aggregation rules require entities treated as a single employer under the controlled-group and affiliated-service-group rules to combine their receipts; a cluster of related businesses that each sit below $32 million but together exceed it will not qualify. Sole proprietors and other non-corporate, non-partnership taxpayers apply the test as though each separate trade or business were its own entity.²

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

The Two Methods You Can Choose

Non-Incidental Materials and Supplies

Under the NIMS method, your 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 (for a retailer or wholesaler, 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 bill has already been paid.

NIMS is the more aggressive simplification. It limits capitalizable inventory costs to direct material costs for manufacturers and acquisition cost for resellers. Direct labor and all indirect costs are excluded from inventory entirely.⁵ A manufacturer deducts labor and overhead in the year those costs are paid or incurred rather than loading them into inventory and recovering them later when goods are sold. For businesses with heavy labor or overhead relative to material costs, the timing benefit can be significant.

Applicable Financial Statement or Books and Records

The AFS method lets you follow whatever inventory accounting method appears on your applicable financial statement. An AFS generally means a statement filed with a government agency (such as a 10-K filed with the SEC), audited by an independent CPA under GAAP, or provided to a creditor for a loan.²

If you have no AFS, you can still use this approach by following the inventory method in your books and records, as long as those records are prepared under your own consistent accounting procedures. Point-of-sale systems that track acquisition costs, physical counts reconciled to that system, internal shareholder reports, and representations made to a creditor about inventory on hand all count.⁴ The limit is that inventory costs cannot be recovered for tax until they have been paid or incurred under your overall method of accounting.

The AFS method usually capitalizes more costs into inventory than NIMS, because financial-statement accounting often loads labor and overhead into inventory. Its advantage is alignment: the tax return mirrors the financials, which cuts down on book-to-tax differences you have to track.

You Also Escape UNICAP

A business that passes the Section 448(c) gross receipts test is also exempt from the Uniform Capitalization rules under Section 263A.⁶ UNICAP normally requires you to capitalize a share of indirect costs (rent, utilities, depreciation, purchasing overhead, indirect labor) into inventory or self-constructed assets. Without it, those costs become current-year deductions when paid or incurred. For a manufacturer with meaningful overhead, that can measurably reduce taxable income.

The exemption is from Section 263A specifically. Other capitalization provisions still apply. Section 263(a) independently requires capitalizing costs that create or improve a distinct asset, so a small business putting up a warehouse still capitalizes the construction costs.⁶

The same gross receipts test also unlocks the cash method of accounting for any entity type³ and lets qualifying contractors avoid percentage-of-completion accounting on contracts expected to finish within two years under Section 460(e).⁶ If you are moving to Section 471(c), it is worth evaluating these together.

How to Adopt It

Switching to a Section 471(c) method is a change in accounting method, filed on IRS Form 3115.⁷ These changes get automatic consent, so no user fee and no private letter ruling wait. The designated change numbers under Section 22 of Rev. Proc. 2024-23 are:

DCN 260 — change to the NIMS method
DCN 261 — change to the AFS or non-AFS method
DCN 262 — change from one Section 471(c) method to another
DCN 263 — change from a Section 471(c) method back to a standard Section 471(a) method⁸

If you are also moving to the cash method in the same year, you need a separate DCN for that change, though both can go on the same Form 3115.⁹

Attach the original Form 3115 to your timely-filed return (including extensions) for the year of change, and send a signed copy to the IRS National Office no later than the date you file the return.¹⁰ Miss the deadline and you lose automatic consent for that year.

The Section 481(a) Adjustment

Any change under Section 471(c) is treated as initiated by the taxpayer with IRS consent,² which triggers a one-time Section 481(a) adjustment to prevent income from being double-counted or skipped in the transition. The timing depends on direction:

A negative adjustment (reducing taxable income) is taken entirely in the year of change. Switching to NIMS often produces a negative adjustment because previously capitalized labor and overhead come out of inventory.
A positive adjustment (increasing taxable income) is spread ratably over the year of change and the following three years.¹¹

If a positive adjustment is less than $50,000, you can elect to recognize the whole amount in the year of change instead of spreading it.¹¹

When You Outgrow the Threshold

A strong year can push your three-year average above $32 million. When that happens, you must change back to a standard Section 471(a) method. Rev. Proc. 2024-23 provides DCN 263 for that transition, and it also gets automatic consent.⁸ Continuing to use Section 471(c) after you no longer qualify means you are on an impermissible method.

The three-year lookback does smooth out one strong year, since the other two years in the average can keep you under the ceiling. If you are approaching the threshold, watch your rolling three-year average well before filing season.

What Gets Businesses in Trouble

The most common error is claiming Section 471(c) without actually qualifying, usually because related entities were not aggregated under the controlled-group rules or because the business is a tax shelter under the 35 percent loss-allocation test. An underpayment that results carries the standard 20 percent accuracy-related penalty for negligence or substantial understatement, with interest from the original due date.¹²

Recordkeeping is the second trap. NIMS still requires tracking when materials are used or consumed and when costs are paid. The AFS or books-and-records method requires that the financial statements or internal records you are conforming to actually exist and reflect consistent accounting procedures. A number reverse-engineered at tax time will not hold up as a books-and-records method.

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
10
Internal Revenue Service. Instructions for Form 3115 (Rev. December 2022)
11
Internal Revenue Service. IRM 4.11.6 – Changes in Accounting Methods
12
Internal Revenue Service. Accuracy-Related Penalty