Excess inventory is one of the biggest hidden drains on profitability.

When too much stock sits on shelves, businesses tie up working capital, pay higher storage costs, risk product obsolescence, and often resort to discounts or write-offs just to clear space.

In this guide, we'll explain why businesses end up with excess inventory and the practical strategies you can adopt to reduce it without creating stockouts.

Why Businesses End Up With Excess Inventory

Many businesses don't intentionally overbuy. Excess inventory is usually the result of planning decisions made with incomplete or outdated information.

Common causes include:

• Forecasting future demand using only last year's sales
• Ordering "just in case"
• Long supplier lead times
• Seasonal demand changing unexpectedly
• Poor visibility across multiple warehouses
• Buying raw materials that aren't required
• Manual spreadsheet planning

Each of these can lead to inventory that sits idle for months before eventually being discounted or written off.

What's the True Cost of Excess Inventory?

Most people think excess inventory only affects warehouse space. In reality, the costs are much broader.

Cash Flow

Money tied up in inventory can't be invested elsewhere.

Markdowns

Products that don't sell often require heavy discounts to clear.

Industry estimates suggest inventory planning mistakes can contribute significantly to unplanned markdown costs.

Obsolete Inventory

Products may become outdated before they're sold.

Expiry

For food, cosmetics, pharmaceuticals and chemicals, excess inventory may never be sold at all.

Storage Costs

Warehousing, insurance and handling costs continue to accumulate while inventory sits unused.

7 Ways to Reduce Excess Inventory

1. Forecast demand instead of guessing

Rather than ordering based solely on last year's sales or intuition, use demand forecasting that accounts for current sales trends, seasonality, and changing buying patterns.

2. Stop buying "just in case"

Buying extra inventory feels safe, but often creates more problems than it solves.

Instead, determine appropriate safety stock levels based on actual demand variability and supplier lead times.

3. Review supplier lead times regularly

Lead times change.

If you're still ordering based on outdated assumptions, you'll likely buy too early, or too much.

Planning software that continuously factors in supplier lead times helps keep purchasing aligned with actual replenishment needs.

4. Forecast raw materials, not just finished products

Manufacturers often over-order components because they only forecast finished goods.

A Bill of Materials (BOM)-based forecast calculates exactly which materials are required for planned production, helping reduce excess stock of ingredients and components.

5. Improve visibility across multiple warehouses

Without a consolidated view of inventory, businesses often purchase stock they already have elsewhere.

Centralized inventory planning reduces duplicate purchasing.

6. Automate replenishment decisions

Manual spreadsheets become increasingly difficult to manage as SKU counts grow.

Automated replenishment recommendations can calculate what to order, when to order, and how much to order based on forecast demand and current inventory levels.

7. Monitor slow-moving inventory

Regularly review products with declining sales before they become obsolete.

Early action, such as adjusting purchasing, bundling products, or running targeted promotions, can prevent costly write-offs.

Real-World Example: Preventing Expired Inventory

Angel Food, a New Zealand-based manufacturer of plant-based foods, faced the challenge of balancing product availability with ingredient shelf life.

As Production Coordinator Justin Maher explains:

"If you run out of stock you not only lose revenue, but also reputation and trust. If you order too much you risk having it expire, selling cheap or dumping. You also create a cash flow issue if you're over-ordering."

By improving inventory forecasting and integrating StockTrim with its existing Cin7 system, Angel Food gained greater confidence in purchasing decisions and production planning, helping reduce unnecessary inventory while maintaining product availability.

Another Example: Faster Purchasing, Less Overstock

Dermal Systems managed more than 150 SKUs, making purchasing both time-consuming and difficult to optimise.

Before adopting StockTrim, creating a single purchase order could take up to 10 days while accounting for sales trends, seasonality, and product expiry dates.

With automated forecasting and purchasing recommendations, purchase orders could be completed in hours instead of days, reducing manual effort and helping avoid unnecessary inventory purchases.

How Inventory Forecasting Helps Reduce Excess Inventory

Reducing excess inventory isn't simply about ordering less, it's also about ordering smarter.

Modern inventory forecasting software can help businesses:

Instead of relying on static spreadsheets or last year's sales, businesses can make purchasing decisions using real-time demand forecasts and replenishment recommendations.

Frequently Asked Questions

What causes excess inventory?

The most common causes include inaccurate demand forecasting, ordering too much safety stock, changing customer demand, long supplier lead times, and poor inventory visibility.

Is excess inventory the same as overstock?

They're closely related. Overstock refers to holding more inventory than needed, while excess inventory often describes stock that has become difficult to sell or no longer supports current demand.

How can manufacturers reduce excess raw materials?

Forecasting production requirements through Bills of Materials (BOMs) helps ensure raw materials are purchased based on actual production plans rather than estimates.

Can inventory forecasting software reduce excess inventory?

Yes. Inventory forecasting software analyses historical sales, demand trends, supplier lead times, and current stock levels to recommend optimal purchase quantities, helping businesses reduce overbuying while maintaining product availability.

About StockTrim

StockTrim is the leading cloud-based inventory forecasting tool purpose-built for SMBs. Since 2017, we've analysed tens of thousands of real SMB inventory datasets to deliver practical, data-driven forecasts and inventory recommendations that businesses can confidently act on.

Connect your inventory data in minutes and see how better forecasting can reduce stock-outs, excess inventory, and manual planning for your business.