Stock Card Explained: How to Read an Inventory Ledger (Kardex)

A stock card is the running history of one item in one warehouse: every receipt, issue and transfer is listed in date order with its document number, and a new balance is calculated after each line. When the system quantity and the shelf disagree, the stock card is where the investigation starts, because it shows which transaction pushed the balance off track and when.

Depending on where you trained, you may call it a stock card, a bin card, an item ledger, a stock ledger or a kardex. The names differ, the logic is the same. This guide walks through what the record contains, why paper and spreadsheet versions break down, a practical routine for reading a stock card line by line to find variances, and what a warehouse system should add on top.

What is a stock card in inventory management?

A stock card records the movements of a single SKU at a single location. If you hold the same hex bolt in a main store and a satellite store, it has two cards, and the company-wide quantity is the sum of both. That separation matters: most variances are local, and mixing locations hides them.

A quantity-based stock card usually carries these fields:

Finance teams often keep a valued version as well, adding unit cost and total value columns so the inventory account can be reconciled. The warehouse cares mostly about units. Both versions should be built from the same transactions; if they are maintained separately, they will drift apart.

Stock card vs bin card vs stock ledger

In older warehouses these were physically different things, and the difference still explains a lot about control:

• Bin card: kept at the shelf. Whoever picked or put away stock updated it by hand, so anyone standing at the location could see the quantity.
• Stock card or stock ledger: kept in the office, written from approved documents only.

Comparing the two was a cheap internal check. If the bin card was lower than the ledger, someone had taken goods without paperwork. If it was higher, a document had been posted for goods that had not moved yet. Modern systems merge the two into one record, but the question you ask is unchanged: does the recorded history explain the physical quantity?

Manual stock cards vs inventory ledger software

Paper cards and spreadsheets still run many small stores. The card itself is not the weakness; re-keying every number by hand is.

Software does not replace discipline. If goods leave without an issue document, no system will notice until the next count. What a good tool does is shrink the gap between the physical event and the record, so a variance surfaces in days rather than at year end.

How to read a stock card and trace a discrepancy

Take a hypothetical case: today’s cycle count finds 42 brass valves on the shelf, while the system says 50. Resist the urge to simply overwrite the balance. Open the stock card for that item and that location and work through it:

1. Find the last trusted point. Usually the most recent approved count. Review only the lines after it.
2. Flag unusual lines. Quantities far above the normal pattern, suspiciously round figures, or documents whose dates do not follow their numbering.
3. Match transfers on both sides. Every transfer out should appear as a transfer in, same quantity, on the destination store’s card. One-sided transfers are the classic source of variance between two stores.
4. Look for unrecorded returns. Material sent back from the line or a customer without a document sits on the shelf but not in the ledger.
5. Check open documents. An issue posted for goods that are still waiting for pickup makes the system lower than the shelf.
6. Verify the unit of measure. One line posted in boxes instead of pieces can multiply the balance.

In our example, the trail led to eight valves handed to maintenance against a written request that never became an issue document. The right fix is to post that missing issue with an explanatory note, not to edit the balance quietly. A clean correction keeps the history honest for the next person who reads the card.

Warning signs worth a second look

• A negative balance at any point, meaning an issue was posted before the receipt that covered it.
• An item with no movements for months that is nevertheless short at the count.
• The same SKU needing a count adjustment cycle after cycle.
• Repeated identical issues outside working hours.
• A persistent gap between the sum of warehouse cards and the figure in the finance ledger.

None of these proves wrongdoing. Each one deserves a direct conversation with whoever runs the store.

Where the stock card fits in a physical count

A count tells you what is there; the stock card tells you what should be there and why it might not be. Reviewing the card before you post count adjustments turns a stocktake from a correction exercise into a learning exercise. We describe counting methods, from annual wall-to-wall counts to rolling cycle counts, in our stocktaking guide. Because every line on the card comes from a receipt or issue, the quality of those documents decides the quality of the ledger; see goods receipt and issue documents for what each one should contain.

One more prerequisite: a stock card only works if each item has exactly one identity. Register the same product under two descriptions and its movements split across two cards, neither of them right. Our guide to item coding and SKU numbering covers how to avoid that.

Stock card and item movement reports in Avadar

In Avadar, P-Soft’s warehouse software, the stock report, item movement report and kardex are part of the shared feature set of all three editions (Industry, Cargo and Trade), with export to Excel in Persian. Ledger lines come straight from the receipt, issue and transfer documents your team records by scanning barcodes or QR codes with a mobile phone or a scanner, or by manual entry. Other points that matter when you read the card:

• Multiple warehouses and zones: stock is held per location, transfers between warehouses are recorded, and each operator works only in their own warehouse.
• Find any item instantly by barcode, serial, batch, name, customer or supplier.
• Recipient signature on the delivery slip for receipts, issues and transfers, so each ledger line has a documented handover behind it.
• Change history: every change in the system is logged, and from the Pro plan an auditor role gives read-only access to review records without editing them.
• Analytical reports from Pro, including shortage trends, slow-moving items and expiry risk, help you spot variances that keep repeating.
• Offline viewing: data stays viewable when the internet connection drops, which is useful in a store with patchy coverage.

The Trade edition also asks for the type of each issue, so sales, theft, damage, samples, consignment and other exit reasons stay distinct on the record. More detail is on the Avadar Trade edition page.

Moving from spreadsheets? P-Soft’s team migrates existing data from Excel or your previous software, with the scope agreed in the plan or contract. Running a full count before the switch means your opening balances start from verified numbers.

Frequently Asked Questions

What is a stock card?

A record of every receipt, issue and transfer of one item in one warehouse, in date order, with the balance after each movement.

Is a kardex the same as a stock card?

In practice yes. Kardex was originally a brand of card filing system, and the name stuck to item-level inventory ledgers in many countries.

What does a negative balance on a stock card mean?

An issue was recorded before the receipt that covered it, usually because a receipt was posted late or an issue was posted in error.

Does Avadar include a kardex report?

Yes. Stock reports, item movement and kardex with Persian Excel export are available in all three Avadar editions.

How often should stock cards be reviewed?

At least for every item with a count variance; high-value or fast-moving items benefit from a weekly look.

Want stock cards that build themselves from scanned documents? Request a trial demo of Avadar and P-Soft’s specialists will suggest the edition and plan that fit your warehouse.

Further reading

• What Is Warehouse Management Software & Why Every Business Needs It
• The Best Warehouse Management Software for Your Business: A Guide to Choosing and Comparing (2026)
• What Is Stocktaking? A Complete Practical Guide

Complete guide: warehouse management software