Bookkeeping for Manufacturing: Tracking Costs From Raw Materials to Finished Goods

Why Manufacturing Bookkeeping Is Different

Manufacturing businesses do not simply buy and sell products. They transform raw materials into finished goods through a production process that adds value at every step. This transformation creates bookkeeping complexity that retail and service businesses do not face.

You need to track costs through three stages of inventory: raw materials, work-in-progress (WIP), and finished goods. You need to allocate overhead costs to products. You need to understand the true cost of manufacturing each item so you can price it profitably.

Getting this right is essential for profitability, pricing decisions, and financial reporting.

Inventory Accounting for Manufacturers

Three Stages of Inventory

Raw materials - The components, materials, and supplies you purchase to use in production. These sit on your balance sheet as an asset until they enter the production process.

Work-in-progress (WIP) - Products that have started the manufacturing process but are not yet complete. WIP includes the cost of raw materials used plus the labour and overhead applied to those partially completed units.

Finished goods - Completed products ready for sale. The cost of finished goods includes all raw materials, direct labour, and manufacturing overhead applied during production.

Your chart of accounts needs separate inventory accounts for each stage. When raw materials are issued to production, you transfer the cost from Raw Materials to WIP. When production is complete, you transfer the cost from WIP to Finished Goods. When you sell the product, the cost moves from Finished Goods to Cost of Goods Sold.

Inventory Valuation Methods

How you value your inventory affects your reported profit. The main methods are:

FIFO (First In, First Out) - The oldest inventory is assumed to be sold first. In a period of rising costs, FIFO results in lower COGS and higher profit.

Weighted Average - The average cost of all inventory is used. This smooths out price fluctuations.

Standard Costing - You set a standard cost for each product based on expected material, labour, and overhead costs. Variances between standard and actual costs are tracked and analysed.

Choose a method that suits your business and apply it consistently. Your accountant can advise on the best approach.

Cost Allocation

Direct Costs

Direct costs are easily traceable to specific products:

• Raw materials - The physical materials that become part of the finished product
• Direct labour - The wages of production workers directly involved in manufacturing

These costs are assigned to products based on actual usage (for materials) or time spent (for labour).

Manufacturing Overhead

Overhead costs support the manufacturing process but cannot be easily traced to individual products:

• Factory rent and utilities
• Equipment depreciation
• Maintenance and repairs
• Quality control
• Factory management salaries
• Indirect materials (lubricants, cleaning supplies)

Overhead must be allocated to products using a systematic method, such as:

• Direct labour hours - Overhead is allocated based on how many labour hours each product requires
• Machine hours - Overhead is allocated based on machine time used
• Material cost - Overhead is allocated as a percentage of material cost

The allocation method you choose affects your reported product costs and therefore your pricing decisions.

Job Costing vs Process Costing

Job Costing

If you manufacture custom or made-to-order products, job costing tracks the costs for each specific job or order. Each job has its own cost record showing the materials, labour, and overhead applied.

Job costing is common in businesses like custom furniture manufacturing, engineering workshops, printing companies, and fabrication shops.

Process Costing

If you manufacture standardised products in continuous or batch processes, process costing averages costs across all units produced in a period. This is simpler than job costing and is common in food manufacturing, chemical production, and any high-volume, uniform product manufacturing.

Xero and Manufacturing

Xero is not a dedicated manufacturing ERP system, but it handles the financial accounting side of manufacturing well when configured correctly. Key setup steps include:

1. Chart of accounts - Create accounts for raw materials, WIP, finished goods, COGS, direct labour, and manufacturing overhead
2. Tracking categories - Use tracking for product lines, departments, or production facilities
3. Inventory items - Set up inventory items in Xero for finished goods you sell
4. Purchase orders - Use purchase orders for raw material procurement

For more complex manufacturing operations, consider integrating a manufacturing-specific tool (like DEAR Inventory, Cin7, or Unleashed) with Xero. These tools handle production planning, bill of materials, and multi-stage inventory tracking, while Xero handles the financial accounting.

Key Financial Metrics for Manufacturers

Gross Margin by Product

Revenue minus COGS for each product, divided by revenue. This tells you which products are most profitable and helps guide your product mix and pricing strategy.

Manufacturing Cost Per Unit

Total manufacturing costs (materials + labour + overhead) divided by units produced. Track this over time to identify cost trends and improvement opportunities.

Inventory Turnover

COGS divided by average inventory. Higher turnover means you are converting inventory to sales efficiently. Low turnover suggests overstocking or slow-moving products.

Capacity Utilisation

Actual production output divided by maximum possible output. This tells you how efficiently you are using your production capacity.

Scrap and Waste Rate

The percentage of materials that become waste rather than finished product. Reducing waste directly improves profitability.

Automating Manufacturing Bookkeeping

While manufacturing has complexity that requires careful setup, much of the routine bookkeeping can still be automated. SortBooks handles the categorisation of supplier payments, utility bills, and operating expenses. Integrated inventory management software handles the production-side accounting.

Together, these tools reduce manual data entry and give manufacturers real-time visibility into their costs, margins, and financial position.