A perpetual system says the warehouse holds 4,000 units. The controlled count finds 3,940. The first result is a 60-unit book-to-count difference. It is not yet a supported explanation of what happened.
Because the perpetual record tracked purchases and sales, the difference is measurable. Reconcile cutoff, ownership, consignment, returns, transfers, duplicate or omitted records, units of measure, damage, and count errors. If that work supports a loss of 60 units, credit inventory for their assigned cost and debit the expense account required by the entity's policy and facts. Correct an identified recording error through its own accounts instead of relabeling it as shrinkage.
A periodic system cannot isolate the same number from its ordinary ledger mechanics. Periodic cost of goods sold is beginning inventory plus purchases less ending inventory, where ending inventory comes from the supported count. Anything missing enters the residual cost of goods sold unless separate records identify the cause. The final total is not necessarily right if the count, rights, cutoff, or cost pool is wrong.
A perpetual system supplies a book figure that can make the difference visible. It does not tell management where the difference came from. The cost-system guidance in ASC 330-10-30-8 emphasizes procedure quality, sound principles, and consistent use. It does not define every book-to-count difference as shrinkage.
Review the Cedar Trail control example and the separate difference practice.
Put the concept to work
Understand this concept
- Explain what shrinkage is and why a perpetual system can measure it while a periodic system buries it in cost of goods sold.
Apply this concept
- Compute shrinkage from a perpetual record and a physical count, and write the entry that brings the record down to the count.
Analyze this concept
- Explain what a rising shrinkage rate implies about controls and about the reliability of reported gross profit, and say what a periodic-system company would see instead.
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Build on these ideas
- Cost of goods sold — Understand
To analyze this concept: Required. Shrinkage lands in cost of goods sold either way; the question is whether it is visible.
- Inventory shrinkage — Apply
To analyze this concept: Required. Reading the figure requires being able to produce it.
- Inventory shrinkage — Understand
To apply this concept: Required. Computing the amount requires knowing what it measures.
Show 3 more prerequisites
- Periodic inventory system — Understand
To understand this concept: Required. The contrast with the periodic system is the point.
- Perpetual inventory system — Apply
To apply this concept: Required. The book figure comes from the perpetual record.
- Perpetual inventory system — Understand
To understand this concept: Required. Only a running record can be compared with a count.
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Use this idea next
- Inventory shrinkage — Analyze
Required level here: apply. Required. Reading the figure requires being able to produce it.
- Inventory shrinkage — Apply
Required level here: understand. Required. Computing the amount requires knowing what it measures.