Manufacturing inventory is more complex than retail because products move through multiple stages before they’re ready to sell. You’re not just buying finished goods and reselling them. You’re buying raw materials, transforming them through production, and selling the finished product. Each stage needs separate tracking.

Raw materials are the components and supplies you purchase to make your products. When materials move into production, they become work-in-progress inventory. Work-in-progress includes partially completed products plus the labor and overhead costs accumulated so far. Once production is complete, items transfer to finished goods inventory where they wait to be sold.

Cost of goods sold captures everything that went into making the products you actually sold during a period. This includes direct materials, direct labor, and allocated manufacturing overhead like equipment depreciation, factory utilities, and production supervision. Getting COGS right matters because it directly affects your gross profit and your tax liability.

Most manufacturers use a bill of materials for each product. This document lists every component and the quantity required to make one unit. When you produce a batch, the system pulls the appropriate raw materials out of inventory based on the bill of materials. This keeps your raw materials balance accurate without manually counting after every production run.

Labor tracking requires employees to log time against specific jobs or production runs. Some manufacturers use time clocks with job codes. Others use production software that tracks labor automatically. However you capture it, the hours need to flow into your accounting system so labor costs attach to the correct products.

Overhead allocation is where many manufacturers struggle. You have to spread costs like rent, equipment maintenance, and utilities across your production in a reasonable way. Common methods include allocating based on direct labor hours, machine hours, or units produced. The method should match how your operation actually uses those resources.

Your accounting software needs to handle this complexity. Inventory accounting for manufacturers requires more than basic QuickBooks. You need a system that tracks multiple inventory types, handles production transfers, and calculates COGS accurately when you invoice customers.

Physical inventory counts verify that your system balances match reality. Most manufacturers count finished goods monthly and do full counts including raw materials and work-in-progress quarterly or annually. Discrepancies happen from waste, theft, damage, or recording errors. Finding them quickly prevents your financial statements from drifting further from reality.

The costing method you choose affects how COGS is calculated when prices fluctuate. FIFO assumes you sell oldest inventory first. LIFO assumes newest inventory sells first. Weighted average smooths out price changes. Each method produces different profit numbers when material costs are rising or falling. Pick a method that makes sense for your business and stick with it.

Accurate inventory and COGS tracking gives you real visibility into product profitability. You can see which products make money and which ones lose money once all costs are included. Without accurate tracking, you might be selling products at a loss without knowing it.

For manufacturing businesses, setting up these systems correctly from the start prevents expensive cleanup later. If your current tracking is a mess or you’re not confident in your COGS numbers, getting professional help to rebuild the foundation is usually worth the investment.