6 Inventory Costing Mistakes CPG Brands Make That Crush Their Margins
Sam's List Editorial | 2026-06-06
6 Inventory Costing Mistakes CPG Brands Make That Crush Their Margins Most CPG founders think they know their margins. They don't. They know their purchase price minus their retail price — which is a completely different number. The most common CPG inventory costing mistakes all distort the same thing: real gross margin, which accounts for every cost to get the product to its first point of sale. When brands miss pieces of that cost picture, they can end up making pricing decisions, channel decisions, and growth investments based on numbers that may be 5-15 points more optimistic than reality. These six mistakes are the most common ways that distortion gets built into CPG financial statements — and why it matters more right now, with tariff volatility making cost structures harder to predict than they've been in years. 1. Using purchase price instead of landed cost in your CPG cost of goods sold The purchase order says $4.20 per unit. That's not your COGS. Landed cost is what it actually costs to get that unit to your warehouse or 3PL. It includes ocean freight or air freight, port fees, customs duties and tariff charges, import brokerage fees, inland transportation, insurance, and any warehousing cost up to the first point of sale. This isn't optional bookkeeping preference — under GAAP (ASC 330) and the tax rules in IRC §471, inventory cost includes the expenditures incurred to bring the goods to their existing condition and location, not just the invoice price. Depending on where you're manufacturing and how you're shipping, landed cost can easily add $0.60 to $1.50 per unit on vetted of a $4.20 purchase price. If you're selling that unit through retail at $12 with a 50% wholesale price of $6, and you're recording COGS at $4.20, your reported gross margin is 30%. Your actual gross margin — using landed cost of $5.70 — is 5%. That's not a rounding error. That's a different business model. This gap is also why so many CPG brands hit $3-5M in revenue and discover they're not actually profitable. The unit economics looked fine on the pitch deck. The pitch deck didn't include freight. 2. Not updating standard costs when tariff rates change Standard costing is a legitimate accounting methodology. Using it as an excuse to avoid updating your cost structure is not. A standard cost is a predetermined cost used as a benchmark for measuring actual cost variances. It's useful for budgeting, manufacturing analysis, and operational efficiency tracking. But it requires periodic updates when the underlying inputs change materially — and tariff rate changes are about as...
