Poor inventory management costs small businesses thousands every year — in dead stock, stockouts, and wasted time. Here's a practical guide to getting your inventory under control.
Why Inventory Management Matters
Inventory is money sitting on a shelf. Too much of it ties up cash you could be using elsewhere. Too little of it means you can't fulfil orders and you lose sales.
For small businesses, poor inventory management is one of the most common causes of cash flow problems — and one of the most fixable. You don't need expensive software or a warehouse management degree. You need a reliable system and the discipline to stick to it.
The Core Concepts
Stock on Hand
The amount of each item you currently have available to sell or use. This needs to be accurate — if your system says you have 20 units but the shelf has 14, you'll oversell and disappoint customers.
Reorder Point
The stock level at which you need to place a new order. Calculate it based on:
Example: You sell 5 units per day and your supplier takes 7 days to deliver. Your reorder point should be at least 35 units (5 × 7), plus a safety buffer of maybe 10 = 45 units.
Safety Stock
Extra inventory held as a buffer against unexpected demand spikes or supplier delays. The right safety stock level depends on how variable your sales are and how reliable your suppliers are.
Carrying Cost
The total cost of holding inventory: storage, insurance, spoilage, depreciation, and the opportunity cost of the capital tied up in stock. For most businesses, carrying costs run 20-30% of average inventory value per year — which is why "just hold more stock" isn't a free solution.
Inventory Methods — FIFO vs LIFO vs Average Cost
How you value inventory on your books affects both your reported profit and your tax liability.
FIFO (First In, First Out): The oldest stock is sold first. This is the most common method and is required by law for many food and perishable businesses. During inflation, FIFO results in lower cost of goods sold and higher reported profit.
LIFO (Last In, First Out): The newest stock is sold first. Allowed in the US but not under IFRS. During inflation, LIFO results in higher cost of goods sold and lower reported profit (and lower tax).
Average Cost (AVCO): All stock is valued at the weighted average purchase price. Simple to calculate, smooths out price fluctuations.
Most small businesses use FIFO — it's intuitive and widely accepted.
Common Inventory Problems and How to Fix Them
Overstocking
Symptoms: Storage space is always full, cash is tight, items regularly go out of date or become obsolete.
Fix: Set strict reorder points and maximum stock levels. Run regular promotions to clear slow-moving stock. Negotiate with suppliers for smaller, more frequent deliveries rather than bulk orders.
Stockouts
Symptoms: Regularly having to tell customers items are out of stock, losing sales, emergency orders at premium prices.
Fix: Increase your safety stock on fast-moving items. Diversify suppliers where possible. Improve demand forecasting — look at seasonal trends in your sales history.
Inaccurate Counts
Symptoms: Your system says one number but the shelf says another. Frequent surprises at month-end.
Fix: Conduct a full physical stock count and reconcile against your records. Then run regular cycle counts — counting a subset of your inventory on a rotating schedule rather than a full count once a year.
Shrinkage
Symptoms: Inventory "disappearing" without a corresponding sale or disposal.
Fix: Tighten access controls, improve counting procedures, and investigate the root cause. Shrinkage can be theft (internal or external), damage, administrative error, or supplier shorts.
Setting Up a Simple Inventory System
For a small business with under a few hundred SKUs, you don't need enterprise software. What you need:
Quotation Expert includes a built-in inventory module. You can add products with stock quantities, set reorder points, and see low-stock alerts. When you create invoices and purchase orders, stock levels update automatically — so your records stay accurate without manual entry.
When to Upgrade Your System
Your simple system will start to strain when:
At that point, dedicated inventory management software (Unleashed, DEAR Systems, Cin7, etc.) or an ERP becomes worth the investment. But most small businesses are nowhere near that threshold — get the basics right first.
The Golden Rule
The best inventory system is the one you'll actually use. A complex system that nobody updates is worse than a simple one that's maintained religiously. Start simple, build the habit, and add sophistication only when you genuinely need it.
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