Redwood Distribution LLC is a nonissuer distributor-manufacturer with inventory of $12,480,000 at year end. Finished Goods are $7,950,000 and Raw Materials are $4,530,000, which foots to the total inventory balance of $12,480,000. Gross margin is 22%, and shrink write-offs for the period total $410,000, which is a concrete signal that inventory is both significant to the financial statements and susceptible to theft and count error, with pricing changes and cutoff creating additional ways the Inventory line can be misstated.
Before we pick procedures, we make one decision that drives everything that follows. Which financial statement assertion is most exposed by each fact pattern, and what does our evidence have to prove to address that exposure. If we map the risk to the wrong assertion, we can do a lot of work and still miss the misstatement, such as testing invoice prices when the real problem is goods in transit that were never recorded.
The assertions we scope to for inventory are existence, completeness, valuation, rights and obligations, and accuracy and cutoff. Each risk factor pushes on one or more of these assertions, and each assertion implies a different kind of evidence. For example, theft risk points to whether the units are physically there, while vendor price volatility points to whether the recorded unit costs still reflect the appropriate measurement basis and whether write-downs were considered.
Put each item into the assertion bucket it most directly threatens, based on what could go wrong in the balance reported. Then commit to that mapping before we talk about procedures. We can refine later, but this first pass is what keeps the audit program from becoming a generic checklist:
What we just organized is the scoping step. Once the risk is attached to an assertion, we can design a response that produces evidence that directly contradicts the risk, rather than evidence that is merely related to inventory in a general way.
After the risk to assertion map is set, the next decision is which audit response gives evidence that actually addresses the assessed risk. Under AU-C 315 and AU-C 330, the auditor’s work links assessed risks of material misstatement to further audit procedures that respond to those risks, so the inventory workpaper file needs to show that chain clearly.
For inventory, some responses are so common that reviewers expect to see them when inventory is material, but they still need to be risk-targeted. Attendance at the physical inventory count is the classic example. When inventory is material and attendance is practicable, the auditor should attend physical inventory counting to obtain audit evidence about the existence and condition of inventory, and that requirement sits in AU-C 501 and governs the auditor’s duty. If we do not attend and do not perform alternative procedures sufficient to obtain appropriate evidence, the consequence is a scope limitation that can drive a modified opinion.
Valuation work is usually a blend of pricing and costing tests and lower-of-cost or market analysis under U.S. GAAP. We do not prove valuation by recounting boxes. Instead, we connect vendor price volatility, standard cost variance, and obsolete SKUs to tests of unit price, cost build-up, and net realizable value considerations. The governing accounting framework for inventory costing and subsequent measurement is ASC 330, which management applies and we audit against.
The output we want is a simple inventory audit program grid that makes the link explicit. The grid is also what an engagement reviewer uses to answer whether the file ties risks to assertions to procedures to evidence, rather than listing procedures with no stated objective. Work through the flow and choose a response and a workpaper deliverable for each risk: