---
title: "COGS Accuracy: Why Wrong Product Costs Break Every Profit Metric"
description: "If COGS is wrong, gross margin, contribution margin, and true net profit are all fiction. How ecommerce teams keep landed cost current."
date: 2026-02-09
updated: 2026-02-09
author: CostRadar Editorial
tags: [cogs, inventory, definitions]
heroKeyword: ecommerce COGS accuracy
draft: false
---

COGS is the foundation of every profitability metric. Stale or incomplete product costs make sophisticated dashboards confidently wrong.

## What belongs in landed COGS

Unit product cost, inbound freight, duties, packaging that travels with the unit, and sometimes 3PL receiving fees. Exclude ads and SaaS—those are selling or operating costs.

Variants matter: the same style in a heavier material can destroy margin if you reuse a single average cost.

## Operating cadence

Update costs when POs land, not when you remember. Sync from the store or ERP; avoid spreadsheet forks. Spot-check top SKUs monthly.

## FAQ

**Should shipping to the customer be in COGS?**

Usually no—treat outbound shipping as a fulfillment/selling cost in contribution margin, unless your accounting policy requires otherwise. Be consistent.

---

CostRadar supports COGS sync, manual overrides, and **quantity-based COGS rules** (tiered unit cost by line qty on Shopify, Amazon, WooCommerce, and BigCommerce) so margin math stays tied to real product cost. Manage tiers under Product Costs; FIFO batches still win when inventory batches remain.