How to Manage Inventory for Amazon FBA

Inventory management is the balancing act at the heart of a physical-product business. Hold too little and you run out, lose sales, and drop in rank. Hold too much and you tie up cash and rack up storage fees. Get it right and stock stops being a source of stress and starts quietly supporting your growth.

This module is mostly about Amazon FBA, where the stakes are highest, but the core discipline, forecast demand, respect lead times, and reorder before you run dry, applies to any seller holding stock.

Every inventory decision sits between two failures. A stockout loses sales and rank at the worst possible moment, usually when a product is selling well. Overstock ties up your cash and, on Amazon, runs up storage fees and surcharges on stock that sits too long. Good inventory management is simply staying in the healthy middle, with enough buffer to avoid stockouts but not so much that you're paying to store dead stock.

Everything downstream depends on a demand forecast: an estimate of how much you'll sell over a period. From that, and your supplier's lead time, you work out when and how much to reorder so new stock arrives before the old runs out. The forecasting and reorder guides below turn that into a process. Get the forecast roughly right and everything else falls into place. Guess at it and you'll swing between stockouts and overstock.

Amazon rewards sellers who keep inventory moving and penalises stock that sits, through storage fees, surcharges on aged inventory, and limits on how much you can send in. Keeping a healthy sell-through, not overstocking slow movers, and clearing dead stock protects both your fees and your capacity to restock the products that are working. The storage-fee guide below covers how to keep those costs down.