In this guide
What Gets Written Off and What Gets Questioned
An auditor looking at scrap asks one question before any other: how much scrap should this process have generated, and how much did it actually record. Scrap generated against scrap expected is the test, because scrap is the easiest route by which material leaves a factory without a sale. Recorded scrap that is consistently below the process standard suggests material is leaving unrecorded; recorded scrap consistently above it suggests good material is being written off and disposed of. Rework carries a different risk. Items sent for rework leave the finished goods count and enter a category with no natural deadline, and rework that never completes accumulates at full cost in a corner of the floor while nobody writes it down. A lender watches this line because both behaviours reduce the security without reducing the reported stock value, and because scrap realisation is one of the few places where cash enters a business without passing through the sales ledger.
Normal Against Abnormal Loss
Every process loses material, and the accounting turns entirely on whether the loss was expected. Process loss built into the standard is normal loss: the swarf, the offcuts, the setting-up pieces and the proportion of output that fails inspection at the rate the process inherently produces. Because it is unavoidable, its cost is absorbed into the cost of the good units produced, which is why a normal loss does not appear anywhere as a separate charge. It is already inside the standard cost of everything that came out. Loss beyond the norm is abnormal, and it is treated as an expense of the period rather than absorbed. The distinction matters because absorbing an abnormal loss into inventory carries a cost forward into the balance sheet that will never be recovered, overstating both closing stock and the profit of the period in which the loss actually happened. Where the accounting differs is therefore the whole practical point. Normal loss is invisible and correct; abnormal loss is visible and charged. A business without a measured norm cannot distinguish them, which means every loss is treated as normal by default and the balance sheet quietly absorbs whatever went wrong.
Rework Stock That Never Moves
Rework is a legitimate category that becomes a problem through inertia rather than through any decision. Parts held for rework indefinitely accumulate because a rejected batch leaves the production flow and enters an area with no schedule attached to it. Nothing forces a decision, no deadline arrives, and the material sits while the line runs on new work that is easier and more urgent. A rework area is frequently the oldest stock on a factory floor. Cost accumulated against recoverable value is the accounting consequence. The parts carry the cost absorbed up to the point they were rejected, plus in some cases the cost of rework already attempted, and that total is compared against what the finished unit would fetch less the cost of completing it. Where the arithmetic no longer works, the material is worth scrap value and is being carried at many times that. Ageing the rework pool is the mechanism that makes this visible. Reporting the balance by the date each batch entered rework, rather than as a single figure, separates material genuinely awaiting a scheduled operation from material that stopped, and the second population is almost always the larger of the two.
Scrap Sales and Their Recording
Scrap is the route by which material most easily leaves a business without a sale, which is why its recording attracts disproportionate attention. Scrap generated against scrap sold is the first reconciliation. The process implies a scrap quantity from the output produced, and that expected figure is compared against what was actually recorded as generated and against what was eventually sold. Recorded generation well below the process norm suggests material leaving unrecorded; sales well below recorded generation suggests scrap accumulating, being disposed of informally, or being sold without the proceeds arriving. Weighment and rate evidence supports the sale itself. The weighbridge slip establishes quantity, the invoice establishes rate, and the two together allow the realisation to be tested against the prevailing market for that material. A rate materially below market on a substantial quantity is a finding in its own right. Where scrap leaves without a record is the failure this whole area exists to prevent. Scrap removed by the contractor who takes it away, disposed of during a shutdown, or handed over informally in exchange for a service is real value leaving the premises, and it is one of the few places where cash can enter a business outside the sales ledger.
Evidence a Write-Off Needs
Scrap write-offs attract attention because they are the easiest route for material to leave without a sale, so the evidence expected is correspondingly specific. Approval within authority is the first requirement: the person authorising the write-off must have had the power to authorise a write-off of that value, and the approval must predate the disposal. Approvals signed after the material has gone are the most common weakness here and are treated as ratification rather than authorisation. The second is physical evidence of the scrapped item, which means the item was seen in its scrapped condition, or its disposal was witnessed, or the weighbridge slip and sale invoice from the scrap dealer tie to the quantity written off. A write-off supported only by an internal note describes an intention. Third is the reconciliation of quantity scrapped to quantity produced, tested against the process norm. Scrap is generated by production at a rate the process implies, so a write-off materially exceeding what the output could have produced is not a valuation question at all; it is a question about what was actually scrapped.
Cleaning the Scrap and Rework Balance
Segregate and quantify before the count rather than leaving a corner of the floor to be resolved on the day. Scrap awaiting disposal, rework awaiting a decision, and material that is simply in the wrong place look identical in a heap and carry entirely different values. Separate them physically, weigh or count each, and record what each actually is. The exercise usually reveals that a substantial part of what was assumed to be rework has been sitting long enough that nobody intends to rework it. Write-off decisions survive review when the approval predates the disposal, sits within the approver's authority, and is supported by evidence proportionate to the value. For scrap that means the weighbridge slip and the dealer's invoice tying to the quantity written off; for rework abandoned as uneconomic it means a costing showing the rework exceeds the recoverable value. Independent verification is worth commissioning where the scrap generated has drifted from the process norm, where the balance has accumulated over years, or where a lender has charge over the stock, and auditing engineering stores covers both populations.
