Negative Inventory – an ERP Software Anomaly?

Mark Canes

Negative inventory means having less than zero of a particular product in stock, and it's a situation that should never occur in any distribution warehouse. Several times a year, we are asked, “Does your inventory management and accounting software support negative inventory?” The answer is no, and in fact, no software should allow it. Negative inventory is a clear sign of poor inventory management and should be eliminated to maintain accuracy and efficiency in your operations.

Causes of Negative Inventory

The most basic example of negative inventory often arises from location and order fulfillment errors. For instance, if a customer places an order for 100 items, and during fulfillment, the inventory system indicates that these items should be picked from Location A (where they were never recorded as being stored), but they are actually picked from Location B, the inventory at Location A will incorrectly show a quantity of -100.

Although, negative inventory can be caused by many other reasons:

  • Immediate Shipments: Product is shipped out before receiving the incoming purchase order (PO) in the system.
  • Invoicing Despite Stockouts: The need to invoice the customer for what is shipped, even if the inventory system says it is out of stock (a common issue in retail environments).
  • Delayed Data Entry: The thought that order entry employees can catch up on data entry later, and everything will be correct at that point (actually, no, it won’t).

Effects of Negative Inventory

Negative inventory can have several detrimental effects on your business, including financial management issues and operational disruptions. It causes inaccuracies in the cost of goods sold (COGS) and affects the inventory values on balance sheets, leading to an inaccurate portrayal of company assets. Operationally, negative inventory disrupts replenishment processes, potentially resulting in stockouts or overstocking. If inventory isn't managed correctly, especially during periods of increased demand due to seasonality, it can leave the business unable to fulfill orders, ultimately affecting customer satisfaction and sales.

The Reality of Implementing Proper Inventory Management Processes

Most perceived needs to handle negative inventory can be resolved by a properly implemented set of business processes. Here’s how:

Immediate Shipments

If you lack the time to receive an inbound purchase order into your ERP software before shipping out to a customer and need a physical invoice document to accompany the shipment, remember that the invoice is just a piece of paper. A modern system can generate a document that looks like an invoice without actually posting that invoice through the system. Later (perhaps at day-end), you can process the PO receipts for the day and post all invoices.

Invoicing Despite Stockouts

In a retail environment, businesses can still process sales and invoice customers even when the inventory system indicates that certain products are out of stock. However, it's important to accurately account for inventory and prevent discrepancies by reconciling inventory records regularly before finalizing daily financial records.

Why Eliminating Negative Inventory is Beneficial

With the right inventory and accounting ERP software and internal business processes, there is no need to track negative inventory. In fact, eliminating negative inventory from your business processes can help you better manage inventory, reduce manual data entry, and eliminate mistakes associated with forgetting to enter information or creating workarounds for dealing with customer orders. In a properly integrated ERP system, other areas of a growing business rely on inventory quantities for decision making and transaction processing - things like reorder procedures, inventory allocation on sales orders, and backorder management.

Improved Inventory Management

Proper inventory management ensures accurate stock levels, which leads to more informed decision-making, better customer satisfaction, and reduced operational costs.

Reduced Manual Data Entry

By eliminating negative inventory, you minimize the need for manual data entry. This reduction decreases the likelihood of human error and frees up time for your staff to focus on more strategic tasks.

Enhanced Accuracy

When you avoid negative inventory, your records reflect the actual stock levels, improving the accuracy of your inventory management system. This accuracy leads to better forecasting, planning, and overall efficiency.

Negative inventory might seem like a quick fix for immediate business needs, but it often leads to more complex problems down the line. By implementing proper inventory management processes and leveraging the right ERP software, you can eliminate the need for negative inventory, streamline your operations, and enhance your business’s overall efficiency.

Don't fall into the trap of negative inventory. Invest in proper inventory management today to see tangible benefits across your business.

Download our Inventory eBook  for inventory best practices.