Accounting Software for Manufacturers: BOM, Costing and Stock

Manufacturing is different from trading. A trader buys a thing and sells the same thing. A manufacturer buys raw materials, consumes labour and machine time, and produces a different finished good. Your accounts have to follow that transformation — otherwise you never truly know what each product costs to make or whether you are selling it at a profit.

This guide explains, in plain language, how accounting software supports a manufacturer through the bill of materials, manufacturing orders, cost flow and stock — with sales tax handled correctly at the end.

The bill of materials (BOM)

A bill of materials is simply the recipe for a finished good. It lists the raw materials — and their quantities — needed to make one unit of the product. For a manufacturer of, say, packaged spices, the BOM for one carton might list the spice mix, the pouches, the labels and the outer box.

A good BOM in software lets you:

• Define exactly what goes into each finished product;
• See the material cost of a product at a glance;
• Know instantly whether you have enough raw materials to fulfil an order;
• Update costs automatically when raw-material prices change.

The manufacturing order

A manufacturing order (sometimes called a production or works order) is the instruction to actually make the goods. When you run it, the software does two things:

1. Issues raw materials — the components in the BOM are consumed and removed from raw-material stock;
2. Receives finished goods — the completed product is added to finished-goods stock, carrying the accumulated cost.

This is the heart of manufacturing accounting: value does not disappear, it moves. Raw-material cost flows out of one stock account and into the finished good.

Key idea: when you complete a manufacturing order, the cost of the raw materials (and any other production costs you add) flows into the value of your finished-goods inventory. Nothing is lost; it is transformed.

How costing works

To price your product and measure margin, you need to know its cost. Manufacturing software builds this up from the BOM.

Material cost

The most direct component: the value of raw materials consumed, typically drawn at the weighted-average cost of your stock so price swings are smoothed out.

Beyond materials

Real product cost also includes labour and overheads. Many businesses start by tracking material cost accurately through the BOM, then layer in other costs as their process matures. Even material-only costing is a huge step up from guessing.

Why manufacturers need this in software

Doing manufacturing accounting on paper is very hard. Every production run touches several stock items and their values. Software keeps it consistent:

• Stock quantities stay accurate for both raw materials and finished goods;
• You can see whether a product is actually profitable at your selling price;
• You avoid running out of a key component mid-order;
• Your financial reports reflect real inventory value, not a guess.

Accurate inventory feeds straight into your profit & loss and balance sheet, so getting production costing right improves the reliability of your whole accounts.

Sales tax and FBR for manufacturers

When you sell finished goods, they are taxable supplies. As a manufacturer of goods you deal with federal sales tax (GST) and, increasingly, FBR Digital Invoicing — where each invoice is reported and returned with an IRN and QR code. Software that applies the right GST rate and reports invoices to FBR keeps your sales side compliant while the BOM and manufacturing orders keep your cost side accurate.

Frequently asked questions

What is the difference between a BOM and a manufacturing order?

A BOM is the recipe — the list of materials to make one unit. A manufacturing order is the act of cooking — it consumes those materials and produces the finished goods, moving the cost into inventory.

Can one product have more than one BOM?

In many systems, yes — for example if you can make the same product from alternative materials. Start with your standard recipe and add variations only when you genuinely need them.

Do I need separate software for manufacturing and accounting?

Not if your accounting system includes manufacturing. Keeping BOM, stock and accounts in one place means the cost of production flows straight into your books without re-entering data.

Iris Accounts is FBR-ready cloud accounting with built-in manufacturing — define a bill of materials, run manufacturing orders that issue materials and receive finished goods, and let the cost flow into inventory, all alongside your sales tax and FBR digital invoicing.