Seven levers that reduce Amazon FBA fees in 2026 — storage, aged-inventory surcharge, low-inventory fee, inbound placement, size tier, AWD, and reimbursements — ranked by impact.

A good inventory turnover ratio for most ecommerce brands is ~4-8x — but it depends on category, margin, and channel. The formula, days-of-supply view, 2026 benchmarks, and the multi-channel catch.

Cogsy frames inventory as a DTC cash-flow decision; SKU Compass forecasts demand across Amazon + Shopify + Walmart with fee math and an optional analyst. Capability comparison and who should pick which.

The two safety stock formulas — the simple max method and the statistical service-level method — with worked examples, a Z-factor table, and the multi-channel catch.

The 6 best inventory tools for Shopify brands in 2026, ranked by who each fits — SKU Compass, Inventory Planner, Shopify native, Cogsy, Cin7, Katana.

Amazon FBA storage fees roughly triple in Q4. How the peak vs off-peak structure works, the aged-inventory surcharge, and how forecasting keeps storage costs down.

The four inventory forecasting types — trend-based, seasonal, causal, and blended/ML — explained, with which SKU profile each fits and why multi-channel brands blend all four.

Five patterns ecommerce agencies use to manage multi-brand inventory in 2026, the capability matrix, and which pattern survives past 10 client brands. The honest operator playbook.

2026 FBA capacity mechanic: how Amazon calculates your quarterly limit, what happens when you hit the cap, and the 6-step operator playbook for staying inside it while keeping sales velocity intact.