Production Cost Management & Manufacturing Accounting in Saudi Factories via ERP

Why So Many Factories Misjudge Their Own Costs

Ask the owner of a mid-sized Saudi factory what one unit of their best-selling product costs, and you will usually get a confident number. Ask how that number was built, and the answer often becomes less certain. Material cost came from last year's price list. Labour was estimated once when the product launched. Overheads were spread as a flat percentage on everything. Meanwhile resin prices changed, a second shift was added, the electricity bill rose and a new packaging line went in.

The result is a cost figure that drifts further from reality each month. Some products look profitable while losing money; others carry overhead that belongs to their neighbours and get priced out of tenders they should win. With Saudi manufacturing growing under the National Industrial Strategy, launched in October 2022 with the aim of tripling industrial output, more factories are competing on price, and cost accuracy has become a competitive weapon.

This guide explains the building blocks of manufacturing cost, the main costing methods with worked numbers, how to read variances, how accounting standards affect inventory valuation, and how an ERP turns costing from a year-end exercise into a daily management tool.

The Three Elements of Product Cost

Every manufactured unit carries three types of cost:

• Direct materials: raw materials and components that become part of the product, plus scrap and normal process losses. In most Saudi factories this is the largest element.
• Direct labour: wages and related costs of workers who work directly on the product, including GOSI contributions, housing allowances and, where relevant, overtime premiums.
• Manufacturing overhead: everything else needed to run the plant: indirect labour such as supervisors and maintenance, machine depreciation, electricity, water, factory rent, consumables, quality testing and plant insurance.

Selling, administrative and distribution costs are not part of product cost for inventory purposes. They matter for pricing and profitability, but they are expensed when incurred.

A worked example

Consider a hypothetical factory in an industrial city producing 20-litre plastic containers. For one batch of 10,000 units:

Materials account for about 77% of cost here, which is typical in plastics. That tells management where to focus: resin consumption per unit and resin price matter far more than shaving a few minutes of labour.

Choosing a Costing System

Job order costing

Used when each order is distinct: a steel fabrication shop building structures to drawings, a print shop running customer-specific jobs, a furniture workshop making fit-out for a hotel. Each job collects its own materials, labour hours and overhead. The question it answers is simple and valuable: did this job make money?

Process costing

Used for continuous production of similar units: food, beverages, chemicals, plastics, cement. Costs are collected by process or department over a period and divided by equivalent units produced. The main technical challenge is valuing partly finished work at period end. If 2,000 units are 50% complete at month end, they count as 1,000 equivalent units for conversion cost.

Hybrid or operation costing

Many factories sit in between: standard processes with product variants, such as a bakery running the same line for several products, or a packaging plant changing moulds between batches. Costing by batch or production order, with standard routings, usually fits best.

Standard Costing and Variance Analysis

A standard cost is what a unit should cost under normal, efficient conditions. Comparing standard to actual cost after each order or period produces variances, and each variance points to a specific operational question.

Continuing the container example, suppose the standard for a 10,000-unit batch is 9,500 kg of resin at SAR 5.20. The actual batch used 9,850 kg bought at SAR 5.35.

• Material price variance: (5.35 - 5.20) × 9,850 = SAR 1,477.50 unfavourable. A purchasing question: did the market move, or did we buy badly?
• Material usage variance: (9,850 - 9,500) × 5.20 = SAR 1,820 unfavourable. A production question: why did we use 350 kg more resin? Start-up scrap, wall thickness drift, or a mould problem?

The same logic applies to labour (rate and efficiency) and to overhead (spending and volume). The point is not the arithmetic, which an ERP does automatically, but the conversation it triggers. A monthly variance review where purchasing explains price variances and production explains usage variances is one of the most effective cost controls a factory can run.

Setting standards that mean something

• Base material quantities on the bill of materials plus a realistic, measured scrap allowance.
• Base labour and machine times on observed cycle times, not on the machine maker's brochure.
• Update price standards at least once a year, and sooner for volatile materials such as polymers and steel.
• Keep standards stable within the period so variances stay meaningful.

Allocating Overhead Fairly

Overhead is where most costing errors hide. A single plant-wide rate, such as 150% of direct labour, is simple but often wrong, because many overhead costs are driven by machines, setups or inspections rather than labour hours.

Activity-based costing in practice

Activity-based costing assigns overhead using the activities that cause it. Suppose a factory's monthly overhead of SAR 600,000 is driven as follows:

Now compare two products. Product A runs in long batches with few setups. Product B is a low-volume specialty item that needs a mould change and an inspection every run. Under a single labour-based rate they might carry similar overhead per unit. Under activity rates, B's true cost rises sharply because it consumes setups and inspections out of proportion to its volume. This is the classic finding: low-volume, high-complexity products are often subsidised by high-volume standard products.

You do not need a full activity-based system to benefit. Separating machine-driven costs from setup-driven costs is often enough to change pricing decisions.

What Accounting Standards Require

Under IFRS as endorsed in Saudi Arabia, inventory is governed by IAS 2. Several points directly affect manufacturing cost:

• Lower of cost and net realisable value: if the expected selling price less completion and selling costs falls below cost, inventory must be written down.
• Normal capacity: fixed production overhead is allocated based on normal capacity. In a slow month the cost per unit is not inflated; the unallocated overhead is expensed in the period. This stops idle capacity being parked in inventory.
• Abnormal waste: abnormal amounts of wasted materials, labour or other costs are expensed, not capitalised into inventory.
• Cost formulas: FIFO or weighted average are permitted; LIFO is not. Standard cost may be used for convenience if results approximate actual cost and standards are reviewed regularly.

The normal capacity rule, with numbers

Suppose fixed overhead is SAR 400,000 per month and normal output is 200,000 units, giving SAR 2 per unit. In Ramadan, output falls to 140,000 units. Inventory still carries SAR 2 per unit, or SAR 280,000, and the remaining SAR 120,000 goes straight to the income statement as an under-absorbed overhead. Management sees the cost of idle capacity clearly instead of finding it buried in stock values.

Yield and Scrap: The Silent Margin Killer

Yield is good output divided by input. In the container example, if 9,850 kg of resin produced 10,000 good containers at 0.95 kg each, yield is 9,500 ÷ 9,850, about 96.4%. Each percentage point of yield on a factory consuming 1,000 tonnes of resin a year at SAR 5.20/kg is worth about SAR 52,000.

Track yield by line, product, shift and mould. Record scrap with a reason code at the machine, not at month end from memory. Regrind that goes back into production should be recorded too, so material consumption is not overstated. Our article on manufacturing challenges discusses the operational causes in more depth.

Using Cost Data for Pricing and Decisions

Contribution margin

For short-term decisions, separate variable cost (materials, variable labour, energy per machine hour) from fixed cost. If the containers have a variable cost of SAR 6.10 and sell at SAR 9.00, each unit contributes SAR 2.90 to fixed costs and profit. A one-off export order at SAR 7.50 still contributes SAR 1.40 per unit if capacity is idle, even though it is below full cost.

Break-even

If monthly fixed costs for the line are SAR 290,000 and contribution is SAR 2.90 per unit, the line breaks even at 100,000 units per month. Knowing that number makes capacity and sales targets concrete.

What-if analysis

If resin rises 10%, from SAR 5.20 to SAR 5.72, material cost per unit rises by about SAR 0.49. Unless the price moves, contribution falls from SAR 2.90 to SAR 2.41, a drop of about 17%. That is the conversation to have with sales before the price increase hits, not after.

A Monthly Cost Review Routine

Costing pays off only when someone acts on it. A simple monthly routine, held within a week of closing, keeps the numbers alive:

1. Finance prepares the pack: actual versus standard cost for the top 20 products by volume, all variances above an agreed threshold, under-absorbed overhead and yield by line.
2. Purchasing explains price variances: market movement, supplier change, urgent buys at premium prices or currency effects on imported materials.
3. Production explains usage and efficiency variances: scrap reasons, machine breakdowns, new operators, mould problems or BOM errors.
4. Sales reviews margins: products or customers whose contribution has fallen below target, and whether price lists need updating.
5. Actions are logged with owners and dates, and the first item on next month's agenda is whether they were done.

Ninety minutes a month is usually enough. Within a few cycles, the same variances stop recurring because the causes are being fixed instead of explained away.

Common Mistakes

• Costing with outdated bills of materials. Engineering changes that never reach the BOM make every cost wrong.
• Ignoring setup costs. Short runs look cheap if setups are buried in general overhead.
• Charging idle capacity to inventory. It inflates stock values and hides the real problem.
• Recording consumption at month end only. Backflushing everything at standard hides usage variances completely.
• Not reconciling costing to the ledger. If cost reports do not tie to the general ledger, nobody will trust them.

How an ERP Turns Costing Into a Daily Tool

Accurate costing needs data from purchasing, inventory, production and payroll at the same time. In disconnected systems, that data arrives late and in different formats. An integrated ERP collects it as work happens:

• Bills of materials and routings define standard material and time for each product.
• Production orders issue materials from stock and record actual consumption, scrap and output.
• Labour and machine time post to orders, giving actual conversion cost.
• Purchase prices flow from invoices into material cost automatically.
• Variances post to the ledger, so cost reports and financial statements agree.

Tranquil supports manufacturers with multi-level bills of materials, material planning, production scheduling, quality checks and barcode integration, all connected to inventory and financial accounting. For a step-by-step guide to the calculation itself, see our article on the cost of production.

Frequently Asked Questions

What is the difference between job costing and process costing?

Job costing tracks each order or project separately and suits custom work. Process costing averages costs over many identical units in a period and suits continuous production such as food, plastics or chemicals.

Can we use standard cost for inventory in our financial statements?

IAS 2 allows standard cost for convenience if the results approximate actual cost. Standards must reflect normal levels of materials, labour, efficiency and capacity utilisation and be reviewed regularly.

How should we treat overhead in a low-production month?

Fixed overhead is allocated on normal capacity. When output falls below normal, the unallocated part is expensed in that period rather than added to inventory.

Is activity-based costing worth the effort for a small factory?

A full system may not be, but separating the biggest overhead drivers, such as machine hours and setups, usually improves cost accuracy enough to change pricing decisions on low-volume products.

Can Tranquil help with manufacturing costing?

Yes. Tranquil connects bills of materials, material planning, production and quality with inventory and accounting, so production costs flow into the books. Contact the Tranquil team to discuss your costing setup.