Inventory Management

Some of the stock in your warehouse will never sell. Not at full price, not at a discount, possibly not at any price. A trend moved on, a newer model launched, a supplier changed the packaging, and now those units just sit there, taking up space and quietly draining cash. That is obsolete inventory, and for ecommerce sellers it is one of the most expensive problems precisely because it is so easy to ignore. Research on inventory costs suggests that obsolescence, shrinkage, and damage together can account for a meaningful slice of total holding cost, and the write-offs land directly on your bottom line. This guide explains what obsolete inventory actually is, how it differs from dead stock and excess inventory, how to identify and account for it, and the practical steps that stop it building up in the first place.

Every unit sitting in your warehouse is costing you money, even when nobody is buying it. Rent, insurance, the cash tied up in stock that could be earning elsewhere, and the slow drift of products toward obsolescence all add up to one number that most online sellers never calculate: inventory carrying cost. Industry estimates put it at roughly 20% to 30% of your average inventory value per year, which means a seller holding $100,000 of stock can quietly bleed $20,000 to $30,000 a year just to keep it on the shelf. This guide explains exactly what inventory carrying cost is, breaks down the formula with a worked example, shows what a healthy percentage looks like, and gives you practical ways to bring it down.

If you have ever restocked a shelf back up to the same fill line every week without really thinking about it, you have used a par level. Par level inventory is one of the simplest and most practical ways to decide how much stock to hold: you set a target quantity for each item, and every time you reorder, you top up to that number. It started in bars, restaurants and hospital supply rooms, where someone walks the shelves and refills whatever has run down, and it has since become a everyday tool for retailers and ecommerce sellers who want a clear, repeatable rule for replenishment. This guide explains exactly what par level inventory is, how to calculate it, how it differs from the reorder point and safety stock it often gets confused with, where it helps and where it falls short, and how to keep par levels accurate when the same stock is selling across several channels at once.

If you have ever seen a product on a shop shelf that the shop did not actually pay for until it sold, you have seen consignment inventory at work. The supplier still owns those goods. The shop is simply holding and selling them, and money only changes hands once a customer buys. It is one of the oldest arrangements in retail, and it has quietly moved online, shaping how some marketplaces, boutiques and dropship-adjacent models operate today. This guide explains exactly what consignment inventory is, who the two parties are, how the process and the accounting work, where it helps and where it bites, and how to keep the stock counts honest when consigned goods are sold across several channels at once.

If you sell across more than one channel, every order, stock count, and price update eventually traces back to one place: your item master. It is the central record that defines what each product is, how it is identified, and how it behaves across your store, your warehouse, and every marketplace you sell on. Get it right and your inventory stays in sync everywhere. Get it wrong and you end up with duplicate SKUs, overselling, and reports that nobody trusts. This guide explains what the item master is, how item master data differs from a SKU or a product master, what fields it should contain, and how to build one that keeps a growing multichannel catalogue under control.

Days Inventory Outstanding (DIO) is the single cleanest answer to one of the hardest questions in ecommerce: how long is my cash trapped in stock before it turns back into revenue? It is a finance metric, not an operations one — your accountant, your bank, and your investors all read it — but the levers that move it sit firmly inside the warehouse and the listing platform. For a multichannel seller juggling Shopee FBS, Lazada FBL, Amazon FBA and a Shopify 3PL, DIO is also the single most underused metric for spotting which channel is quietly bleeding working capital.