Material Costs: Direct vs. Indirect and Their Impact on Production

Every manufactured product has a cost story behind it – and that story begins with materials. Whether it’s the timber cut to shape a dining table or the machine oil that keeps the factory running smoothly, material costs are at the heart of every production decision. According to NetSuite, material costs typically represent 30% to 70% of the total cost of a finished product, making them the single largest controllable expense in manufacturing. Understanding how these costs are classified – and how they behave – is essential for accurate pricing, cost control, and long-term profitability.

What are material costs? 🔗

Material costs refer to all expenses incurred for raw materials and supplies used during the production process. They are not limited to just what ends up in the final product; they include everything consumed along the way to get there. The Corporate Finance Institute classifies material costs as a core component of product costs – alongside direct labor and manufacturing overhead – all of which together determine what it truly costs to manufacture a unit.

In cost accounting, material costs are broadly divided into two categories: direct materials and indirect materials. The key distinction between them comes down to one concept: traceability.

Direct materials: the core of the product 🔗

Direct materials are raw materials or components that physically become part of the finished product and can be directly traced to specific units of output. ControlHub explains that direct materials are essential to creating the product and can be measured precisely per unit produced – for example, the fabric in a garment, the steel in a car chassis, or the timber used to build a furniture piece.

Two defining characteristics set direct materials apart from other cost elements:

Traceability: You can link a specific quantity of direct material to a specific unit of output. A furniture manufacturer can calculate exactly how many board feet of timber went into a single chair. This traceability is what makes direct materials measurable and verifiable.

Significant cost impact: Direct materials typically account for a large share of total production costs. NetSuite notes that direct material costs often range from 30% to 70% of total product costs, depending on the industry. This makes accurate tracking of direct materials critical for setting selling prices and evaluating profitability.

How direct material costs are calculated 🔗

Calculating direct material cost goes beyond just the purchase price of raw materials. A complete direct material cost includes several components. NetSuite’s formula outlines it as follows:

Direct material cost = [(Raw material cost + Indirect taxes) – Discounts] + Freight-in + Storage + Packing

This means freight charges, warehousing costs before materials enter production, and any applicable taxes are all included in the final direct material cost figure. Businesses that overlook these components risk underestimating their true production costs.

Accounting treatment for direct materials 🔗

Direct materials are tracked through a formal inventory system. Indeed’s career resource explains that direct materials flow through work-in-progress inventory, finished goods inventory, and ultimately into the cost of goods sold (COGS) once the product is sold. This treatment ensures that the cost of direct materials is matched against the revenue they generate – a fundamental principle of accurate financial reporting.

Manufacturers using job costing (common in custom furniture or small-batch production) trace direct material costs to specific jobs. Those using process costing (common in high-volume industries like beverages or steel) assign them across entire departments or production processes.

Indirect materials: the support system of production 🔗

Indirect materials are supplies used during production that either do not become part of the finished product or cannot be economically traced to individual product units. Cost accounting author Mike Piper explains that indirect materials include items where direct tracing is technically possible but not cost-effective – such as screws, nuts, and bolts in assembly manufacturing, or cleaning supplies and lubricants used across the factory floor.

Indirect materials are essential to keeping production running. Without machine lubricants, equipment breaks down. Without safety gloves and masks, workers cannot operate. Without cleaning solvents, machinery corrodes. Yet none of these items physically appear in the product a customer holds in their hands.

Common examples of indirect materials 🔗

Indirect materials vary by industry but some common examples found across manufacturing settings include:

Lubricants and machine oils used to maintain and operate production equipment. Cleaning supplies such as solvents, detergents, and brushes used to maintain the production environment. Safety and protective equipment including gloves, masks, goggles, and protective clothing worn by workers. Small fasteners like nuts, bolts, screws, and adhesives that technically go into the product but are too inexpensive to trace unit by unit. Office and administrative supplies used in production-related paperwork, such as printer ink or stationery.

As CFI illustrates with a table-manufacturing example: the wood is a direct material, but the nails that hold it together are an indirect material – classified as manufacturing overhead because individually tracing nails to each table is not practical or cost-effective.

Accounting treatment for indirect materials 🔗

Because indirect materials cannot be traced to individual products, they are grouped into manufacturing overhead. Indeed notes that companies typically use an informal inventory record-keeping system for indirect materials and include their costs in overhead or operating expenses. When the quantities used are small, it is also acceptable to charge them as an expense when incurred, rather than tracking them through a formal inventory system.

Direct vs. indirect materials: a side-by-side comparison 🔗

The table below summarizes the key differences between direct and indirect materials to make the distinction clearer:

Why material cost classification matters for production 🔗

Correct classification of material costs is not just an accounting formality – it has real consequences for business decisions.

Accurate product pricing 🔗

When a business misclassifies its material costs, it risks setting prices that do not reflect the true cost of production. Business News Daily highlights that understanding the true costs behind a product allows businesses to price competitively while ensuring expenses are fully covered. A price set without accounting for both direct and indirect material costs can result in thin or negative margins that only become visible when it is too late to correct.

Profitability analysis and cost control 🔗

NetSuite reports that effective management of direct material costs alone can save manufacturers between 10% and 20% in total production costs. This is achieved through precise material tracking, waste reduction, supplier negotiations, and better inventory management. Indirect material costs also create savings opportunities – NetSuite’s manufacturing cost management guide identifies them as a frequently overlooked area where better purchasing practices and bulk procurement can meaningfully reduce overhead.

Tax and financial reporting compliance 🔗

Business News Daily notes that properly tracking direct and indirect costs also supports compliance with tax and grant regulations – some costs are tax-deductible, and misclassification can lead to missed deductions or reporting errors. For businesses receiving government grants or external funding, the distinction between direct and indirect costs becomes especially important.

Managing material costs effectively 🔗

Understanding material cost classification is the first step. The next is applying that knowledge to reduce costs and improve production efficiency.

Strategies for direct material cost management 🔗

For direct materials, cost management centers on supplier relationships, quality control, and inventory systems. Building long-term partnerships with reliable suppliers often leads to better pricing and guaranteed supply. CostItRight.com points out that companies face significant vulnerability when raw material prices fluctuate unexpectedly, particularly when they lack systems to monitor commodity price trends. Diversifying suppliers and implementing just-in-time inventory practices helps reduce both over-stocking risks and carrying costs.

Quality control is equally important. When direct materials are substandard or improperly stored, entire production batches may be affected – multiplying the financial cost of a single input error. Tracking direct material usage variance (the difference between expected and actual material use) is a standard tool for identifying waste or inefficiency in production lines, as Indeed explains.

Strategies for indirect material cost management 🔗

Indirect materials are often managed less rigorously than direct materials, but their cumulative impact on overhead costs can be significant. Effective strategies include consolidating purchases to achieve bulk discounts, standardizing the types of supplies used across the facility, and implementing reorder point systems to avoid emergency purchases at higher prices. Meru Accounting notes that regularly monitoring material consumption trends across production cycles helps prevent over-ordering and unnecessary inventory build-up, which ties up working capital without adding production value.

Technology’s role in material cost tracking 🔗

NetSuite emphasizes that modern cloud-based ERP (Enterprise Resource Planning) systems integrate procurement, production, and financial data into a single platform, giving manufacturers real-time visibility into both direct and indirect material costs. This integration eliminates manual tracking errors, improves forecasting accuracy, and supports more informed negotiations with suppliers.

Material costs in different industries 🔗

The balance between direct and indirect material costs varies considerably across industries, and understanding these differences helps contextualize cost management strategies.

In textile manufacturing, direct materials – cotton fiber, dyes, buttons, and zippers – make up the bulk of production costs, while indirect materials like thread lubricants and machine cleaning agents play a supporting role. In automotive manufacturing, steel, rubber, and glass are direct materials, while the machine oil used in assembly equipment, welding electrodes, and packaging supplies are all classified as indirect. In food processing, the ingredients that go into the product are direct materials, while cleaning chemicals, labels, and maintenance supplies are indirect. Industry research suggests that in some manufacturing sectors, direct material spending can account for up to 70-85% of total revenue – underlining just how consequential material cost decisions are.

The link between material costs and overall production cost 🔗

Material costs do not exist in isolation. They interact directly with labor costs and manufacturing overhead to form the total manufacturing cost. NetSuite’s guide to total manufacturing cost notes that investing in higher-quality materials may increase direct material costs but can simultaneously reduce waste, defects, and rework – ultimately lowering overhead and labor costs related to quality control. This means decisions about material sourcing and classification ripple outward through the entire cost structure of a business.

Accurate classification and management of both direct and indirect materials is therefore not just an accounting exercise – it is a strategic business function. It shapes pricing decisions, drives profitability analysis, informs supplier negotiations, and determines how efficiently a business converts inputs into outputs.

What do you think? If you were managing a furniture manufacturing business, how would you decide which materials to classify as direct versus indirect – and where would you start looking for cost savings? Now consider a different industry, such as food processing or automotive assembly: do you think the balance between direct and indirect material costs would shift significantly, and how might that change your cost management priorities?

References

1. https://www.netsuite.com/portal/resource/articles/accounting/direct-material-costs.shtml
2. https://corporatefinanceinstitute.com/resources/accounting/product-costs/
3. https://www.controlhub.com/purchasing-terms/supply-chain-direct-vs-indirect-materials
4. https://www.indeed.com/career-advice/career-development/direct-vs-indirect-materials
5. https://obliviousinvestor.com/direct-cost-indirect-cost/
6. https://www.businessnewsdaily.com/5498-direct-costs-indirect-costs.html
7. https://www.netsuite.com/portal/resource/articles/accounting/manufacturing-cost-management.shtml
8. https://www.costitright.com/blog/the-challenges-of-managing-raw-material-cost-change-effectively/
9. https://www.meruaccounting.com/cost-accountant-manufacturing-cost-strategies/
10. https://www.netsuite.com/portal/resource/articles/accounting/total-manufacturing-cost.shtml