A manufacturer can know the total monthly expense and still not understand the cost of a particular product. An average hides which batch consumed more material, where purchase price changed, how much defects cost and why more labour hours were required.
Planned-versus-actual analysis is not primarily about assigning blame. It separates market change from process failure and shows which causes the business can influence.
Three cost levels
| Level | Source | Decision supported |
|---|---|---|
| Planned | Expected prices, standards and future volume | Budget, selling price and profit plan |
| Standard at release | Approved BOM and rates when the work order starts | Expected cost under the approved process |
| Actual | Real materials, time, services and good output | Result and root-cause analysis |
The plan may have been prepared a month earlier. The released standard captures conditions at the start of work. Actual cost records the result. Comparing actual only with an old plan mixes purchase-price inflation with workshop overconsumption.
What belongs in manufacturing cost
- raw materials, components and semi-finished items;
- direct labour or a controlled production-time rate;
- machine time where it can be measured reliably;
- outsourced services for a specific operation;
- process energy and other directly attributable resources;
- a justified share of production overhead.
Administration, marketing and customer delivery may be needed for full profitability, but should not be silently mixed into technological manufacturing cost. Each cost level needs a documented method.
Example: one production batch
The work order planned 100 good units. Actual output was 92 good units, five reworkable units and three irrecoverable defects.
| Cost element | Plan, UAH | Actual, UAH | Variance |
|---|---|---|---|
| Materials | 40,000 | 45,600 | +5,600 |
| Direct labour | 18,000 | 20,700 | +2,700 |
| Machine time | 8,000 | 8,800 | +800 |
| Outsourced operation | 4,000 | 4,000 | 0 |
| Total | 70,000 | 79,100 | +9,100 |
Planned cost per good unit was UAH 700. If all actual costs are divided by 92 good units, the result is UAH 859.78. The UAH 159.78 difference matters, but does not yet say what to change.
Split the variance into causes
| Cause | How to test it | Who can influence it |
|---|---|---|
| Material price | Actual minus standard price × actual quantity | Purchasing, supplier and contract terms |
| Material usage | Actual quantity minus standard for actual output | Technology, cutting and issue discipline |
| Component substitution | Compare approved and consumed item references | Technology and purchasing |
| Labour efficiency | Actual hours minus standard hours | Work organisation, training and equipment |
| Scrap and rework | Resources spent on output not accepted first time | Quality, process and operator |
| Low yield | Batch cost divided by fewer good units | Planning, quality and process stability |
One variance can have several causes. Material price may have risen by 6%, while quantity used also exceeded standard by 4%. The first suggests sourcing or selling-price action; the second requires a process investigation.
Separate price and usage effects
Material price variance = (actual price − standard price) × actual quantity.
Material usage variance = (actual quantity − standard quantity for actual output) × standard price.
This split distinguishes the market or purchasing effect from consumption on the production floor.
Account for scrap visibly
Irrecoverable scrap cost should not disappear into a total material figure. Record it separately with a reason code. Reworkable output accumulates additional material, labour and machine time until it becomes acceptable.
If the standard includes validated process loss, compare actual loss with that allowance. Do not raise the standard after every unsuccessful batch merely to improve the report.
Common analysis errors
- Actual monthly cost is compared with a plan for a different product mix and volume.
- All output, including irrecoverable scrap, is treated as good units.
- Material-price change is blamed on production usage.
- Overhead is allocated through arbitrary rules that create false precision.
- Old batches are recalculated with a new BOM version.
- Only percentages are reviewed while value and recurrence are ignored.
What management needs in the report
The report should drill from total variance to work order, product, material, operation and reason. Show value, percentage, review owner and corrective-action status.
Priority belongs to recurring variances with material financial, delivery or quality impact, not automatically to the largest percentage.
Conclusion
Planned cost supports a future decision, the released standard captures approved conditions, and actual cost evaluates the result. Their differences should be separated into price, quantity, labour, scrap and yield effects.
Start with the three latest work orders: retain their BOM versions, collect actual inputs and explain the largest differences through specific operations. Explore the Business Reactor manufacturing module.
