How to improve inventory accuracy in a warehouse

More orders should not mean more time looking for stock, checking shelves or stopping to sort out exceptions. But when a picker asks, “Is this item actually here?”, the warehouse is already feeling the cost of inaccurate inventory.

The best way to improve inventory accuracy is to record each time stock moves: when it arrives, goes onto a shelf, moves to a pick face, is picked and is packed. If one of those steps happens outside your system, your stock records will eventually stop matching what is in the warehouse.

For most eCommerce retailers, the issue is lots of small gaps: a carton moved to make room, a short delivery not recorded, or a fast-selling item taken from bulk storage without updating the pick location. Those gaps add up to slower fulfilment, oversells and extra work.

Table of contents

• What is inventory accuracy in a warehouse?
• What causes inventory inaccuracies in a warehouse?
• How can you improve inventory accuracy?
• When do you need a WMS for inventory accuracy?
• See the warehouse workflow in action
• Start with one item, not a big overhaul
• Frequently asked questions

What causes inventory inaccuracies in a warehouse?

Inventory inaccuracies usually start when the stock move and system update become separate jobs. Check these five places first.

1. Receiving: was the delivery checked and recorded?

The problem can begin before stock reaches a shelf. A delivery may be marked as complete even though it is short, damaged or still sitting in a receiving area. Later, the system says the stock is available, but the warehouse team cannot pick it.

Ask these questions:

• Can the team see whether stock is still inbound, being checked, ready for putaway or available to sell?
• Does receiving capture the item and quantity when the stock arrives?
• Can someone record a short delivery, damaged unit or unexpected item without using a spreadsheet or leaving a note for later?

2. Putaway: does every item have a clear home?

Stock is not much use to a picker until it has a reliable location.

If people put stock “somewhere sensible” when they are busy, the process depends on memory. Clear zones, aisles, shelves and bins give everyone the same language. Scanning during putaway updates the shelf and the system together.

3. Stock moves and replenishment: can stock move without being recorded?

Some stock discrepancies happen after receiving. A carton gets moved out of the way. A team member tops up a pick face from bulk storage. The stock may still be in the building, but it is no longer where the system says it is.

This is why a warehouse can look well stocked while a picker is staring at an empty bin. Treat replenishment as a proper step with a clear source and destination.

4. Picking and packing: are errors caught before dispatch?

Picking and packing do not create every stock error, but they are often where an earlier problem becomes obvious. A picker finds an empty bin. A similar-looking item is picked instead. A packer notices the wrong quantity once the label is ready.

If the issue is mainly checking online orders as they leave the warehouse, a scan-led Pick & Pack workflow may be the right place to start. Compare Pick & Pack and Starshipit WMS to work out whether you need outbound checking or broader stock control.

If the issue begins before the picker reaches the shelf, extra packing checks will not fix the cause. You need to track the full journey of stock.

5. Stocktakes and exceptions: are you fixing the number or the reason?

Cycle counts and stocktakes help you find differences early. But they are a check, not a cure.

When a picker finds missing, damaged or incorrect stock, find the last point where it was handled. Fix that repeat problem, not simply the stock number.

When do you need a WMS for inventory accuracy?

A simple operation may only need a stronger picking and packing process.

A WMS becomes useful when receiving, locations, stock movements, replenishment and shipping need to work together.

Starshipit Warehouse Management brings inventory control, warehouse workflows and multi-carrier shipping together. Barcode-led workflows can support receiving, putaway, replenishment, picking, packing and stock moves, while location tracking helps the team see where stock is held.

If the trouble starts earlier in the warehouse, a WMS may be the missing piece.

Use stock status to stop the wrong stock becoming available

One of the most useful changes is separating stock that has arrived from stock that is ready to sell. In WMS, your team can work with stock that is incoming, available or allocated, rather than treating every unit in the building as pickable.

For example, a supplier delivery may arrive with 200 units, but 15 need checking because the cartons are damaged. Those units can stay in a staging or Quality Control location while the rest is received and put away. The picker sees stock they can actually use, rather than stock that is technically on site but not ready for an order.

The same thinking matters for returns. A jacket that comes back from a customer is not automatically sellable. It can go to a Returns or Quarantine location first, then move back to a pick face only after inspection. That keeps a damaged or incomplete item out of the normal fulfilment flow.

Use movement history to find the cause of a discrepancy

When stock is wrong, the immediate temptation is to adjust the number and move on. A better question is: what happened just before the record stopped matching the shelf?

Starshipit WMS records stock movements and adjustments, so a warehouse manager has a trail to follow. If a fast-selling water bottle keeps showing as available but the pick face is empty, look at the last receipt, putaway, replenishment and adjustment. You may find that replenishment is happening, but the source and destination are not being confirmed consistently. That points to a process to tighten, rather than a reason to keep recounting the same SKU.

For Shopify retailers, keeping warehouse stock and the storefront aligned matters too. Starshipit WMS can sync inventory changes back to Shopify, helping teams avoid a separate manual update after stock is received, adjusted or used to fulfil an order.

What does this look like in practice?

You do not have to change every workflow at once. Some teams start with purchase orders, receiving, putaway and stocktakes in WMS, then bring in picking and packing when ready. This is often a sensible first step when the team trusts its shipping process but not its stock records.

If you are comparing options, read our guide to choosing an eCommerce WMS. It will help you test systems against the work your team needs to do every day.

See the warehouse workflow in action

Our webinar shows how Starshipit WMS supports the path from receiving and putaway through to replenishment, picking, packing and shipping. It is a useful companion if you want to see the processes behind the checklist above in action.

Start with one item, not a big overhaul

Pick one item that your system said was available but the team could not find. Trace its journey from receiving to dispatch. Each time someone relied on a spreadsheet, a verbal instruction, memory or a separate system, you have found a place where inventory accuracy can slip.

Fix that step first. More volume can then mean more orders moving through a process your team can trust, rather than more time spent chasing stock.

Ready to see how it could work in your warehouse? Watch the webinar above, then book a Starshipit WMS walkthrough.