Most manufacturers can tell you what a product costs. Fewer can tell you when that figure was last calculated, and fewer still would defend it against current purchase prices. Product costing tends to be accurate on the day it’s set and decreasingly true from then on.
What Goes Into a Real Product Cost
Direct material is the obvious layer, and even here there’s a choice to make. Standard cost gives you stable comparisons and clean variance analysis. Actual or moving average cost gives you current reality. Standard is better for control, actual is better for pricing decisions — and if you only maintain one, know which questions it can’t answer.
Direct labour comes from routing times at the relevant labour rate. The common error is using theoretical cycle times rather than demonstrated ones. If the routing says four minutes and the operation actually takes five and a half, your labour cost is understated by nearly forty percent on that step.
Manufacturing overhead is where most costing loses accuracy. A single plant-wide rate applied on labour hours systematically misallocates: it overcosts labour-intensive products and undercosts machine-intensive ones. If your product range varies in that dimension, your relative margins are wrong even if the total is right.
Scrap and yield belong in the cost, not in a variance account. If a process reliably yields ninety-four percent, the cost of the six percent is a real cost of that product.
Landed cost on purchased items — freight, duty, handling, financing — belongs in material cost. Quoted price alone understates it, sometimes substantially.
Rolling Up Through The Structure
In a multi-level BOM, cost accumulates upward. Components roll into sub-assemblies with their own labour and overhead, which roll into finished goods. Done properly, this tells you not just what a product costs but where the cost sits — which is the information you need to do anything about it.
A finished good showing sixty percent of its cost in one sub-assembly points straight at where engineering or sourcing attention will pay off.
Why Real-time Matters
Costs recalculated quarterly mean quoting against a stale figure. In a period of input price movement, a quarter is long enough for margin to disappear entirely on a product you’re still quoting confidently.
Real-time costing also changes what you can see. Which products’ margins are eroding right now. What a supplier’s price increase does to your portfolio before you accept it. Whether a proposed engineering change actually saves money once the full roll-up is applied.
Practical Steps
Update purchase prices continuously from actual receipts rather than periodically by hand. Validate routing times against measured performance annually. Move from a single overhead rate to rates by work centre — this alone usually reveals that your product profitability ranking was wrong. And run a variance report monthly comparing standard to actual, sorted by value, because the top few lines are where the money is.
ticktick.ai maintains cost roll-ups against live purchase prices and demonstrated routing times, and flags where standard and actual have diverged materially.
