A dormant inventory balance and this year’s inventory deduction are two different questions. A qualifying business may have a valid method for deducting merchandise purchases while still needing to investigate an old asset on its balance sheet.
A recent JAG discussion raised exactly that issue. An equipment reseller was described as using cash accounting and deducting purchases when paid. Yet an inventory account reportedly had remained unchanged for years. The question was whether the purchase deductions were permitted—and whether the old balance simply needed a bookkeeping adjustment.
This is an ongoing planning case, generalized to protect the business’s identity. The discussion did not include verification of the ledger or prior returns. No adjustment, filing or tax savings is reported here.
First, separate the purchase method from the old balance
The reported facts suggested two lines of inquiry. How does the business actually account for new merchandise purchases? And what originally created the inventory balance that has stopped moving?
An unchanged account can be a clue to a dormant carryover. It could also represent costs from an earlier method, an incomplete bookkeeping process, or a balance disconnected from another inventory record. Its age does not establish which explanation is right.
Separating those questions prevents a common mistake: treating a possible current deduction as permission to write off every amount labeled inventory.
When merchandise can be deducted before sale
Section 471(c) offers simplified inventory methods to eligible small businesses. Eligibility includes the applicable gross-receipts test and exclusion of tax shelters. Related-business aggregation and other special rules can affect that test. For tax years beginning in 2026, the indexed ceiling is $32 million of average annual gross receipts for the preceding three years. IRC §471(c); Rev. Proc. 2025-32, §4.30
An eligible business without an applicable financial statement may follow its qualifying books-and-records inventory method. If those regular records expense merchandise purchases, a cash-method taxpayer may deduct qualifying costs when paid, even before sale. An unpaid invoice does not qualify merely because it has been entered in the books.
The alternative treatment as nonincidental materials and supplies generally waits until customer delivery and payment or incurrence, whichever comes later. Choosing that method is not the same as choosing purchase-cost expensing. Treasury Regulation §1.471-1(b)(4), (6)
For a broader explanation of eligibility, payment timing and the records that control current purchase deductions, see our small-business inventory guide.
Counting units is different from allocating their cost
Example 6 of the regulation permits purchase-cost deductions despite regular physical counts. Example 7 reaches a different result for a reconciled point-of-sale ledger tracking acquisition costs and inventory quantities: costs allocated to goods still on hand remain in ending inventory.
Treasury’s explanation makes the distinction practical. Quantity counts used for reordering do not themselves defeat expensing. Regular records that allocate costs to inventory must be considered, even if a later financial-statement adjustment expenses those costs. T.D. 9942, books-and-records discussion
Can the tax return be the books?
The useful question is what records the business actually uses. A cashbook or tax-basis spreadsheet can support the analysis; separate GAAP books are not the point. But the return alone does not automatically establish the required business-record treatment. The regulation looks to records reflecting business activities for non-tax purposes. Treasury Regulation §1.471-1(b)(6)(i)
For this discussion, the statement that purchases were deducted needed a follow-up: deducted in which records, after which year-end adjustments, and on which returns? A debit to purchases during the year may later be offset by an inventory adjustment. The final accounting matters.
Why an old balance needs its own investigation
Before selecting an entry, reconcile the account’s origin and history with the prior tax treatment:
- Find the entry that created the balance and its offsetting account.
- Check purchase postings, payment records, year-end adjustments and any separate costed inventory reports.
- Compare prior deductions, tax inventory amounts and book-tax reconciliations.
In a follow-up, the business’s reported facts were clarified: current purchases were consistently expensed, but the old capitalized cost had not been deducted. That narrows the question to how the unrecovered historical cost should be recovered. A method transition and an isolated prior-year error can require different procedures; the remaining balance is not automatically a current-year purchase deduction.
The discussion then narrowed further: the balance was described as a prior-year bookkeeping error, and the owner did not want to amend prior returns. If that classification is substantiated, an appropriate book-only prior-period correction may remove the asset without claiming the old deduction in current-year tax COGS. That route must remain separate from a change in an established inventory method.
On that stated fact pattern, the proposed bookkeeping entry is a debit to opening retained earnings or the appropriate owner-equity account and a credit to inventory, assuming the historical error overstated that equity. The correction stays out of current-year expense and does not claim a current-year tax deduction for the old cost. A genuine posting-error correction does not itself require Form 3115 or a Section 481(a) adjustment. The workpaper should document the error, the unclaimed prior-year cost and the decision not to seek an amended-return refund; the entity’s reporting framework determines the final presentation. Rev. Proc. 2015-13, §2.02
If the underlying costs were already deducted, removing the book asset must not create another tax deduction. If they were never deducted, the proper recovery year and procedure still need to be determined. Neither a current expense entry nor an opening-equity adjustment should be selected without tracing the facts.
Error correction or accounting-method change?
A genuine posting error differs from changing when costs are deducted. A consistently applied timing practice can be an accounting method even when it was incorrect. Calling the proposed entry a cleanup does not settle that distinction. Rev. Proc. 2015-13, §2
When a method change is needed, the starting method affects the procedure. DCN 261 covers qualifying changes into the financial-statement or books-conformity methods. DCN 262 addresses certain changes within an existing Section 471(c) method, including changes to the underlying book inventory treatment; that book-treatment route carries no audit protection. The balance’s label does not choose the change number. Rev. Proc. 2025-23, §§22.18–22.19
A qualifying business can generally obtain automatic consent when it and the particular change satisfy the applicable requirements. That normally means properly completing Form 3115, attaching the original to the timely filed original return for the change year, and filing the separate signed duplicate by the applicable deadline—generally no later than the actual filing of that return. Automatic consent still requires following the procedure. Rev. Proc. 2015-13, §6.03
A Section 481(a) adjustment can account for qualifying opening inventory costs whose deduction timing changes, including costs never previously deducted. For a cash-method business, the payment requirement still applies. The calculation prevents omitted or duplicated deductions; it is not an automatic write-off of the old book balance. Costs already deducted do not generate another deduction merely because the asset account remains. No such calculation or filing has been verified in this case. Rev. Proc. 2025-23, §§22.18–22.19
Our Form 3115 overview introduces the broader method-change process. Each proposed change still needs the current procedure and its own method history.
Where the case stands
The working conclusion is a conditional book-only prior-period correction on the reported prior-year-error and no-amendment facts. The original entry, appropriate equity account and reporting basis still need support. No posted entry, deductible amount or return filing has been verified.
This merchandise analysis also does not make land or builder-owned homes currently deductible. Our home-builder tax-method guide explains that separate boundary. Equipment kept for use in the business and goods allocated to installation contracts also require their own analysis.
Start with a bookkeeping reconciliation that explains the balance and a tax-planning review that establishes the permissible treatment. A clearer balance sheet and an earlier deduction may be related objectives, but one does not prove the other.
General federal tax discussion, updated September 11, 2026. Case facts are reported rather than independently verified; the outcome remains open.
Joe Gallegos, CPA/CVA
Partner-in-Charge · JAG CPA & Co.
Author of The Ultimate Guide to Choosing a CPA
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