Inventory Shrinkage: Formula, Causes & Prevention

Inventory shrinkage is the difference between the inventory a business's records say it should have and the inventory physically available.

A common formula is:

Inventory Shrinkage = Recorded Inventory − Physical Inventory

Shrinkage rate can be expressed relative to recorded inventory or another consistent inventory base, depending on the business's reporting method.

Inventory shrinkage example

If records show $50,000 of inventory but a physical count finds $47,500, shrinkage is $2,500.

Using recorded inventory as the denominator:

Shrinkage Rate = $2,500 ÷ $50,000 = 5%

What causes inventory shrinkage?

Theft

External theft and employee theft can both reduce physical stock without a corresponding system transaction.

Receiving errors

A purchase order may show 100 units received when only 96 arrived, or the wrong SKU may be booked into inventory.

Unrecorded damage or spoilage

Broken, expired, or discarded inventory creates a discrepancy when the loss is not recorded.

Transfer errors

Multi-location businesses can create shrinkage-like discrepancies when stock leaves one location but the transfer is not recorded correctly at both ends.

Returns and refunds

Incorrect return processing can add stock back to the system even when the physical item never returns to sellable inventory.

Counting and unit errors

Cases counted as individual units, duplicate SKUs, barcode errors, and simple counting mistakes can all create mismatches.

Why inventory does not match the POS

A POS records sales, but inventory can still diverge when receiving, returns, waste, transfers, recipes, or manual adjustments are incomplete or incorrect. Before labeling every discrepancy as theft, verify the product mapping, unit of measure, recent deliveries, refunds, damage, and location transfers.

Use the last reliable physical count as a starting point and trace the largest variances through the transaction history. Repeated differences on the same SKU or at the same location usually indicate a workflow or control problem.

How to reduce inventory shrinkage

• Perform regular cycle counts
• Investigate repeated variances before adjusting them
• Reconcile supplier deliveries against purchase orders
• Track damage, spoilage, and write-offs consistently
• Use clear transfer workflows between locations
• Control access to high-value inventory
• Use consistent units of measure and SKU labeling
• Review unusual adjustment and return patterns

Shrinkage prevention controls

Why cycle counting helps

Waiting for one annual count means problems can continue for months. Cycle counting helps identify discrepancies closer to when they occur, which makes root causes easier to investigate.

Shrinkage vs. inventory variance

Inventory variance is the broader difference between system and physical quantity. Shrinkage often refers specifically to unexplained or loss-related shortages. Businesses should define their reporting terms consistently.

Shrinkage across multiple locations

Measure discrepancies by store and by SKU. A company-wide number can hide one location with recurring receiving, transfer, theft, or process issues.

How often should shrinkage be measured?

Measure often enough to identify causes while transaction history and staff context are still available. High-value, fast-moving, or repeatedly inaccurate products deserve frequent cycle counts. Review a company-wide shrinkage rate on a consistent financial cadence, but investigate location- and SKU-level variances sooner.

How Stash fits

Stash centralizes inventory records, purchasing, and multi-location stock visibility. A clearer transaction history makes it easier to reconcile physical counts with expected inventory and investigate discrepancies.

Frequently asked questions

Is all shrinkage theft?

No. Theft is one cause, but receiving errors, damage, spoilage, transfers, returns, and counting mistakes can also create shortages.

Can shrinkage be negative?

If physical inventory is higher than recorded inventory, the result is usually treated as a positive variance or overage rather than shrinkage.

How can a retailer find the cause of shrinkage?

Start with the largest repeated variances, recount them, and review receiving, sales, returns, transfers, waste, and adjustments since the last reliable count. Compare patterns by product and location.