If you buy finished products and sell them on, your inventory has one job: count what's on the shelf. If you make what you sell, your inventory has three jobs at once. It has to track the materials sitting in your workshop, the half-finished batches on your bench, and the boxed products ready to ship, and it has to keep all three honest at the same time. Treating those as one pile of "stock" is where a lot of small makers lose track of what they actually have, and what it actually cost them.
Resellers count one thing. Makers count three.
A reseller's stock moves in one direction: buy a unit, sell a unit. The cost of that unit is whatever you paid your supplier, and it doesn't change between the day it arrives and the day it leaves.
A maker's stock moves through stages. Raw materials arrive from suppliers and sit untouched until they go into production. Once they're cut, mixed, sewn or assembled, they become work in progress: no longer raw, not yet sellable. Only once a batch is complete does it become finished goods, ready to pick, pack and ship.
Each of those stages needs to be visible separately. If your system only shows one number for "stock on hand," you can't tell whether you're low on the ribbon you need to finish an order, or low on the finished product itself. Those are very different problems that call for very different actions.
Why the three stages need to be tracked apart
Think about what each stage tells you.
Raw materials on hand tell you what you can start making right now, and what you need to reorder before your next production run. If you only track finished goods, you'll find out you're short on fabric the day you sit down to cut, not the week before when you could have reordered calmly.
Work in progress tells you where your cash is currently tied up. Half finished stock has had labour and materials poured into it, but it isn't sellable yet. A maker who doesn't track WIP separately often underestimates how much value is sitting unfinished on the bench, which makes cash flow harder to plan.
Finished goods tell you what you can actually promise a customer today. This is the only stage a pure reseller needs to think about, which is exactly why maker inventory feels harder: you're managing the input, the transformation, and the output, not just the output.
Costing works differently too
For a reseller, the cost of a unit is simple: purchase price, plus freight, plus any landing costs. For a maker, the cost of a finished item has to absorb the raw materials that went into it, the labour to make it, and a fair share of overhead like power, rent on the workshop, or machine time.
This matters at tax time as much as it does for pricing. The Australian Taxation Office treats raw materials, work in progress and finished goods as three components of the one thing: trading stock. All three need to be accounted for, and for manufacturing businesses, production overhead costs need to be factored into the value of work in progress and manufactured stock, not just the raw material cost.
If you're only pricing off what the raw materials cost you, and not what it costs to turn them into a finished product, your margins will look healthier on paper than they are in your bank account.
The stocktake question small makers ask
A formal stocktake across three stages sounds like a lot of admin for a one or two person operation, and the ATO has recognised that. Businesses with an aggregated turnover under $10 million (and in some cases up to $50 million) can use the simplified trading stock rules, which mean you don't need to do a formal stocktake or account for stock value changes at all, provided the value of your trading stock hasn't moved by more than $5,000 over the year.
If your raw material and finished goods levels stay fairly steady month to month, this concession can save real time. But it's worth checking your own numbers against the threshold each year rather than assuming it still applies, since growth can tip a small maker over that $5,000 movement faster than expected.
A simple system that works at small scale
You don't need a factory-grade MRP system to track three stages properly. What you do need is a way to see each stage as its own number, not a blended guess.
A workable starting point looks like this: hold raw materials under their own SKUs, separate from the products they'll become. When a batch goes into production, move the quantities of raw material consumed out of raw stock, even if you're doing this with a simple production record rather than a live factory floor system. When the batch is complete, bring the finished units into stock as their own SKU, with a cost that reflects materials, labour and a reasonable share of overhead, not just the ingredients.
The specific method matters less than the habit of never letting one number stand in for all three stages. Even a maker doing this on a spreadsheet at the start will make better buying and pricing decisions than one who only ever looks at "units in the shed."
When it's time to stop guessing
Plenty of makers run this well on a spreadsheet in the early days, tracking raw materials, work in progress and finished goods in separate tabs. It tends to hold up until you're running multiple product lines, selling into wholesale as well as direct, or trying to work out why cash feels tight when sales look fine. That's usually the point where separate tabs stop talking to each other and the picture gets harder to trust.
Hum keeps raw materials, work in progress and finished goods as separate, visible stock, connected to the orders and channels you sell through, so you can see what's on the bench and what's ready to ship without reconciling three spreadsheets by hand. If that sounds like where you're headed, Hum offers a free 28 day trial, no consultant required to get started.