Inventory Observation: Cutoff Testing, Fraud Flags, and WIP

Inventory observation is the audit procedure in which the auditor attends the client’s physical inventory count, evaluates how the counting is done, performs independent test counts, and gathers evidence that the inventory balance on the financial statements exists and is accurately recorded. The audit procedures used for inventory observation are set out in PCAOB Auditing Standard 2510 for public company audits and in AU-C Section 501 of the AICPA’s Statements on Auditing Standards for private company audits, and both frameworks treat physical presence at the count as the baseline expectation whenever inventory is material.¹²

The procedures target three financial statement assertions. Existence means the inventory recorded in the books is physically present. Completeness means every item on the warehouse floor is captured in the count records. Valuation is addressed as a byproduct of handling and inspecting the goods, because damage, spoilage, and obsolescence are only visible in person. An auditor who issues an opinion without performing observation carries the burden of justifying that decision.¹

Planning Work Before the Count Date

Preparation often decides whether the day of the count produces useful evidence. Client management is expected to write and distribute formal counting instructions to everyone who will participate, and those instructions should specify how to identify and segregate damaged goods, consignment inventory, and items belonging to third parties. The auditor reviews the instructions before the count. If they don’t address partially counted areas or count-tag control, the fix has to happen before the day arrives.

Risk assessment then drives what the audit team will sample. Inventory categories with the highest dollar value, the most historical count discrepancies, or the greatest susceptibility to theft and obsolescence get heavier test-count coverage. The auditor also selects which physical locations to visit, mixing the main warehouse with remote or off-site storage so no material segment is left uncovered. AS 2510 requires the auditor to be present at the time of count and to satisfy themselves about the effectiveness of the counting methods, so planning also nails down timing, staffing, and coverage.¹

The auditor also confirms that the client has a documented cutoff system for shipping and receiving. Without one, there is no clean way to determine which goods were in the building at the count moment and which had already left or not yet arrived.

Procedures During the Physical Count

Once counting begins, the auditor works alongside it rather than watching from the wall. The central procedure is the independent test count, and it runs in two directions.

The first direction starts with physical goods. The auditor selects items on the warehouse floor and traces them to the client’s count sheets. An item sitting in the building but missing from the sheet is a completeness problem. The second direction reverses that. The auditor picks tag numbers or line items from the count sheets and walks the floor to locate the corresponding inventory. If the tag says 200 units and only 150 can be found, that is an existence problem. Both directions get documented in working papers with item descriptions, locations, and verified quantities.

Discrepancies from test counts are raised with the client’s count supervisor while the audit team is still on the floor. The point is not to reconcile the difference quietly later; it is to trigger a recount and correction while the inventory has not moved.

Cutoff Testing

Cutoff is where many inventory misstatements hide. The auditor records the serial numbers of the last shipping and receiving documents processed before the count is finalized. Those numbers become the bright line: anything shipped under those document numbers left the building and should not be in the count, while anything received under those numbers should be included. After the count, the same document numbers are compared against the sales and purchase journals to verify that transactions landed in the correct period. A shipment that left the dock on count day but appears in next period’s sales journal is a misstatement.

Condition Assessment

Walking the floor exposes inventory condition that a spreadsheet cannot. Rusted parts, expired packaging, and unsold seasonal merchandise collecting dust in a corner all feed the valuation analysis. Under ASC 330, inventory is carried at the lower of cost or net realizable value, so items that clearly cannot be sold for their recorded value may need a write-down.

Fraud Red Flags on the Floor

Physical counts are one of the few audit procedures where fraud can be visible in real time. Empty boxes stacked to appear full, areas of the warehouse the client steers the auditor away from, and count teams recording numbers without actually counting are all warning signs. Patterns in the data reinforce what the floor reveals: abrupt inventory swings during peak periods, frequent write-offs management cannot explain, and large balances of aged or unsellable inventory carried at full value all suggest the recorded balance may not reflect reality. Unresolved discrepancies between physical counts and recorded quantities are the most direct indicator, and PCAOB inspectors have specifically flagged engagements where audit teams failed to investigate those differences.³

Handling Work-in-Process Inventory

Finished goods sit on shelves and count cleanly. Work-in-process does not. A partially assembled product does not lend itself to a simple unit count, because the auditor also has to assess how far along it is in production. WIP valuation typically includes raw materials consumed so far, labor invested, and a share of manufacturing overhead.

The auditor evaluates whether management’s estimated completion percentage looks reasonable given what is physically visible. A product management describes as 80% complete but visibly missing most of its components warrants further inquiry. During the count, the auditor discusses the stage of completion with production floor supervisors, compares those assessments against the client’s cost records, and notes any items where the physical state contradicts the recorded percentage. Those observations become critical evidence for subsequent valuation testing.

When the Count Date Differs From Year-End

Companies do not always count on the last day of the fiscal year. AS 2510 permits the count to happen “within a reasonable time before or after the balance-sheet date” as long as the auditor is present and satisfied with the counting methods.¹

When a gap exists, the auditor tests transactions that occurred during it. If the count happened in November and the fiscal year ends in December, purchases, sales, and other inventory movements during December are traced to reconcile the count results to the year-end balance. The standard specifically requires “appropriate tests of intervening transactions” and inspection of the records of the client’s count procedures on which the year-end balance rests.¹

PCAOB inspectors have called out audit teams that skipped this step. One recent inspection deficiency was that the engagement team “did not perform appropriate procedures to test inventory movement between the interim date and period-end date when the physical inventory observation is as of the interim date.”³

Cycle Counting and Perpetual Inventory Systems

Not every client shuts down for a wall-to-wall annual count. Companies with well-maintained perpetual records often use cycle counting, rotating through inventory segments over the year. AS 2510 accommodates that approach with conditions attached.

When reliable perpetual records are periodically compared against physical counts, the auditor’s observation procedures can be performed during or after the end of the audit period rather than at a single count date. Some companies go further and use statistical sampling or other controls that make a complete annual count of every item unnecessary. The auditor may accept this only after confirming that the client’s procedures produce results substantially the same as a full annual count. The auditor still has to be present to observe counts as deemed necessary and to verify the effectiveness of the counting procedures. For statistical sampling specifically, the auditor must be satisfied that the sampling plan is reasonable, statistically valid, properly applied, and produces reasonable results.¹

The evidentiary bar is high. Inspectors have flagged cases where audit teams relied on a client’s cycle count program without obtaining sufficient evidence that the procedures were actually reliable enough to substitute for a full count.³

Inventory Held Off-Site or by Third Parties

Inventory in public warehouses, with consignment partners, or at other off-site locations creates a distance problem. The auditor cannot visit every location. AS 2510 uses a tiered approach based on materiality.

The starting point is direct written confirmation from the custodian of the quantities held. For engagements where the off-site portion is not a large share of total assets, that confirmation may itself provide adequate evidence.¹

When the off-site inventory is a significant proportion of current or total assets, confirmation alone is not enough, and the auditor applies one or more additional procedures:

Review the client’s procedures for evaluating the warehouse operator’s performance and reliability.
Obtain an independent accountant’s report on the warehouse operator’s controls over custody of goods, commonly a SOC 1 report, or perform alternative procedures at the warehouse.
Observe a physical count at the location, if practicable.
If warehouse receipts have been pledged as loan collateral, confirm the details with the lenders.

The choice depends on risk. A highly material off-site balance with a custodian the auditor has never evaluated warrants more work than a long-standing warehouse relationship with a clean controls report.¹

When the Auditor Cannot Attend the Count

Sometimes the auditor is engaged after the client has already completed its physical count, or circumstances make attendance genuinely impossible. AS 2510 does not permit the auditor to simply skip observation. Testing accounting records alone is never sufficient to satisfy the auditor about inventory quantities.¹

The auditor makes or observes some physical counts and tests transactions between the original count date and the balance sheet date. That work is paired with inspection of the client’s records from the count: instructions, completed tags and sheets, reconciliation reports, and any booked adjustments. If the client used well-maintained perpetual records with periodic physical checks, timing may be more flexible, but some physical verification is still required.

When an auditor is engaged for a period where no count was observed, such as auditing prior-year financial statements, the standard allows satisfaction through alternative procedures like testing prior transactions, reviewing records of prior counts, and applying gross profit tests, but only if the auditor has already been able to verify the current year’s inventory.¹ If none of these alternatives produces sufficient evidence, the auditor faces a scope limitation that affects the audit report, ranging from a qualified opinion to a disclaimer depending on how material the balance is.

Follow-Through Procedures After the Count

The physical count produces raw data. The work that turns it into audit evidence happens afterward. Test count results are traced to the client’s final inventory compilation, which is the document that becomes the basis for the balance sheet figure. A compilation that does not match what the auditor counted on the floor indicates either an unexplained adjustment or an error to investigate.

The auditor evaluates adjustments the client made between the physical count and the final inventory listing. Companies routinely book adjustments for count errors, damage identified after the fact, or timing differences in receiving. Each adjustment needs documentation and a reasonable explanation. Large unexplained adjustments are a red flag for manipulation.

Cutoff testing continues after the count. Shipping and receiving document numbers recorded on count day are compared against sales and purchase journals to confirm transactions landed in the correct period. A sale recorded in December for goods that did not leave the building until January overstates cost of goods sold and understates ending inventory, or the reverse, depending on the direction of the error. For engagements where the count date and balance sheet date do not align, the roll-forward or roll-back procedures happen during this phase, with every significant category of inventory movement tested for anything that would push the year-end balance away from what the count established.

Inspection findings repeatedly point to the same weak spots in this after-the-count work: audit teams that fail to test the accuracy and completeness of period-end inventory listings, that skip pricing tests on aged inventory, that perform no valuation testing at all, or that limit themselves to reviewing the client’s own reconciliation rather than performing independent substantive tests of completeness, existence, and valuation.³

1
Public Company Accounting Oversight Board. AS 2510 Auditing Inventories
2
AICPA & CIMA. Statements on Auditing Standards Currently Effective
3
Public Company Accounting Oversight Board. Staff Update on 2024 Inspection Activities Spotlight