What causes inventory shrinkage and how does it show up in my bookkeeping?

Inventory shrinkage is the gap between what your accounting system says you have and what you actually have on the shelf. When you do a physical count and come up short, that missing inventory is shrinkage. It’s one of the most common profit leaks for businesses that carry physical products.

The causes generally fall into five categories. Theft is the one everyone thinks of first, and it includes both external (shoplifting, customer theft) and internal (employee theft). Damage covers products that get broken during handling or storage and can no longer be sold. Spoilage applies to perishable goods like food, beverages, or certain beauty products that expire before they’re sold. Receiving errors happen when a shipment comes in short or you accept fewer units than what was invoiced but record the full amount in your system. And miscounts are simple human mistakes during physical inventory counts or when entering quantities into your point-of-sale or accounting software.

In your books, shrinkage shows up the moment you compare your physical count to your recorded inventory balance. If your system says you have 200 units of a product but you only count 185, those 15 units represent shrinkage. The dollar value of that difference needs to be removed from your inventory asset account on the balance sheet.

The adjustment typically flows into one of two places. You can add it to cost of goods sold, which treats the lost inventory the same as inventory that was sold. Or you can create a separate shrinkage expense account, which is the better approach if you want to actually monitor how much you’re losing. A dedicated account lets you track shrinkage as a percentage of sales over time and spot trends that might point to a specific problem.

In QuickBooks, you would record an inventory adjustment that reduces the quantity on hand for each affected item. The offset goes to your chosen expense account. If you’re doing this quarterly or monthly after physical counts, the process becomes routine. Waiting until year-end to count and adjust means you’re flying blind for most of the year and potentially making decisions based on inventory values that aren’t real.

Tracking shrinkage separately also helps you figure out where to focus. If shrinkage keeps climbing, you might need better receiving procedures, security cameras, tighter access controls in the stockroom, or more frequent counts of high-value items. A small business bookkeeper who understands inventory can help you set up your chart of accounts and reporting so shrinkage is visible instead of buried.

For businesses in food service, retail, or e-commerce, shrinkage is not a one-time event. It’s ongoing. Building regular physical counts into your operations and recording adjustments promptly keeps your financial statements accurate. Your profit margins, reorder decisions, and pricing all depend on knowing what you actually have on hand versus what the computer thinks you have.

If your inventory accounting has never been set up to track shrinkage, start with a full physical count, compare it to your current book balance, and record the adjustment. From there, count on a regular schedule and watch the numbers. You can’t fix what you’re not measuring.