2026-06-09 · 7 min
Amazon Inventory Management Best Practices 2026
Running out of stock costs you ranking and revenue. Overstocking costs you storage fees. This guide covers reorder points, FBA fee management, and forecasting tools.
Why Inventory Management Is Critical on Amazon
Running out of stock on Amazon is expensive. You lose Buy Box eligibility, rankings drop because the algorithm penalizes stockouts, and rebuilding ranking takes time. Overstocking is also expensive: FBA long-term storage fees accumulate on slow-moving inventory. The goal is staying in stock without holding excess.
Calculating Your Reorder Point
Your reorder point is the inventory level at which you place a new purchase order. The formula is: average daily sales times your lead time in days, plus safety stock. If you sell 10 units per day, your supplier takes 30 days to deliver, and you want 15 days of safety stock, your reorder point is (10 x 30) + (10 x 15) = 450 units. Place a new order when you reach 450 units in stock.
Managing FBA Storage Fees
Amazon charges monthly storage fees and additional long-term storage fees for inventory held more than 365 days. For slow-moving products, calculate whether the storage cost erodes your margin. Products with a high storage fee relative to their sale price (e.g. large, lightweight items) often perform better through FBM rather than FBA.
Inventory Forecasting Tools
Amazon's own restock recommendations in Seller Central are useful for high-velocity products but often unreliable for seasonal or slow-moving items. Third-party tools like Inventory Planner, Skubana, or RestockPro provide more sophisticated forecasting that accounts for seasonality, supplier lead times, and days of supply at current sales velocity.