Accounting for Manufacturing Businesses

TL;DR

Manufacturing businesses track costs differently because they transform raw materials into finished products. You'll learn how to account for these unique costs, including direct materials, direct labor, and manufacturing overhead. Understanding these will help you determine the true cost of goods produced.

1. The Mental Model

Think of manufacturing accounting as a special type of cost tracking that follows products through different stages: from raw ingredients, to partially built items, to the final product sitting ready for sale. It’s all about figuring out the total cost to make something.

2. The Core Material

When a company manufactures goods, its inventory isn't just one type. Instead, you'll deal with three main inventory accounts:
* Raw Materials Inventory: These are the basic materials you buy to make your product (e.g., wood for furniture, flour for bread).
* Work-in-Process (WIP) Inventory: This is where goods are currently being manufactured but aren't yet finished. Costs like direct materials, direct labor, and manufacturing overhead get added here.
* Finished Goods Inventory: These are complete products ready to be sold to customers.

The costs that go into making a product are categorized as:
* Direct Materials (DM): Materials that can be directly and easily traced to the finished product (e.g., the steel in a car, the fabric in a shirt).
* Direct Labor (DL): The wages paid to workers who directly transform raw materials into finished goods (e.g., assembly line workers, bakers).
* Manufacturing Overhead (MOH): All other indirect costs associated with the factory and production process. These costs can't be easily traced to individual products. Examples include factory rent, utilities, depreciation on factory equipment, indirect materials (like glue or nails), and indirect labor (like factory supervisors or maintenance staff).

You'll track these costs as they flow through the inventory accounts. Here's a simplified flow:

graph LR
    A["Purchase Raw Materials"] --> B("Raw Materials Inventory")
    B --> C("Work-in-Process Inventory")
    DL["Direct Labor"] --> C
    MOH["Manufacturing Overhead"] --> C
    C --> D("Finished Goods Inventory")
    D --> E("Cost of Goods Sold")

Calculating Cost of Goods Manufactured (COGM)

Photo by Leeloo The First on Pexels

This is a key calculation in manufacturing accounting. It represents the total cost of products completed and transferred out of Work-in-Process Inventory into Finished Goods Inventory during a period.

Here's the formula:

Beginning Work-in-Process Inventory
+ Direct Materials Used
+ Direct Labor
+ Manufacturing Overhead Applied
- Ending Work-in-Process Inventory
= Cost of Goods Manufactured

Calculating Direct Materials Used

Photo by https://kaboompics.com/ on Pexels

Before you can calculate COGM, you need to know how much direct material was actually used in production.

Beginning Raw Materials Inventory
+ Purchases of Raw Materials
- Ending Raw Materials Inventory
= Direct Materials Used

3. Worked Example

Let's say your manufacturing company has the following information for the month of January:

• Beginning Raw Materials Inventory: $10,000
• Purchases of Raw Materials: $50,000
• Ending Raw Materials Inventory: $15,000
• Beginning Work-in-Process Inventory: $20,000
• Ending Work-in-Process Inventory: $25,000
• Direct Labor: $30,000
• Manufacturing Overhead Applied: $40,000

First, let's calculate Direct Materials Used:

$10,000 (Beginning RM)
+ $50,000 (Purchases)
- $15,000 (Ending RM)
= $45,000 (Direct Materials Used)

Now, let's calculate the Cost of Goods Manufactured (COGM):

$20,000 (Beginning WIP)
+ $45,000 (Direct Materials Used)
+ $30,000 (Direct Labor)
+ $40,000 (Manufacturing Overhead)
- $25,000 (Ending WIP)
= $110,000 (Cost of Goods Manufactured)

So, during January, $110,000 worth of goods were completed and moved from the production line into the finished goods warehouse.

4. Key Takeaways

• Manufacturing businesses use three inventory accounts: Raw Materials, Work-in-Process, and Finished Goods.
• Product costs include Direct Materials, Direct Labor, and Manufacturing Overhead.
• Manufacturing Overhead covers all indirect factory costs like rent, utilities, and supervisors' salaries.
• The Cost of Goods Manufactured (COGM) represents the total cost of products completed during a period.
• Understanding COGM is crucial for determining the value of finished goods and later, the cost of goods sold.

Common Mistakes to Avoid:

Photo by KATRIN BOLOVTSOVA on Pexels

• Mixing up product costs (DM, DL, MOH) with period costs (selling and administrative expenses).
• Forgetting to include beginning and ending inventory balances in your calculations.
• Including non-factory overhead (like sales office rent) in Manufacturing Overhead.
• Not understanding that "Direct Materials Used" is different from "Purchases of Raw Materials."

5. Now Try It

Imagine you're reviewing a small furniture maker's records for a month. They started with $5,000 in raw wood, bought another $12,000 worth, and ended up with $3,000 of raw wood. They paid their carpenters $8,000, and their total manufacturing overhead for the month was $6,000. Their work-in-process inventory started at $4,000 and ended at