Standard Costing and Variance Analysis: Managing Performance
Standard costing sets predetermined (standard) costs for materials, labour, and overhead before production begins. Actual costs are then compared against these standards. Any difference is called a variance, and investigating variances reveals why actual performance differed from the plan — and who or what is responsible.
Setting Standards
- Standard Material Cost = Standard Quantity per unit × Standard Price per unit
- Standard Labour Cost = Standard Hours per unit × Standard Rate per hour
- Standard Overhead Cost = Standard Hours per unit × POHR
Types of Variances
Material Variances
- Material Price Variance = (Standard Price − Actual Price) × Actual Quantity Purchased. Did we pay more or less than planned per unit of material?
- Material Usage Variance = (Standard Quantity − Actual Quantity Used) × Standard Price. Did we use more or less material than planned?
- Total Material Variance = Price Variance + Usage Variance
Labour Variances
- Labour Rate Variance = (Standard Rate − Actual Rate) × Actual Hours Worked. Did we pay more or less per hour than planned?
- Labour Efficiency Variance = (Standard Hours − Actual Hours) × Standard Rate. Did workers take more or fewer hours than planned?
Worked Example
Standard: 2 kg material @ $50/kg = $100 per unit.
Actual: 100 units produced using 220 kg @ $48/kg.Price Variance = ($50 − $48) × 220 kg = $440 Favourable (paid less than standard — good)
Usage Variance = (200 std kg − 220 actual kg) × $50 = $1,000 Adverse (used more than standard — investigate)
Total Material Variance = $440F − $1,000A = $560 Adverse
Interpreting Variances
A favourable variance (F) means actual cost was below standard — generally good, but investigate if it signals quality compromise (cheaper but inferior material may cause higher usage variance). An adverse variance (A) means actual cost exceeded standard — generally bad, but may be acceptable if caused by deliberate decisions (e.g., using premium materials to reduce defect rates).
Standard Costing in Practice
Standard costing is most valuable in manufacturing environments with repetitive processes. It simplifies bookkeeping (products can be costed consistently), supports budgeting, and provides clear accountability. However, in rapidly changing markets or with flexible/customised production, standards can become quickly outdated.
Lesson Summary
- Standard costing sets pre-determined costs; variance analysis compares actual vs. standard.
- Material variances: price variance ($/unit) + usage variance (quantity used).
- Labour variances: rate variance ($/hour) + efficiency variance (hours worked).
- Favourable = below standard cost; Adverse = above standard cost.
Standard Costing: The Budgeting Tool for Manufacturing
Standard costs are predetermined benchmarks for what each unit should cost under normal, efficient operating conditions. They serve as targets that management compares to actual results. Deviations — called variances — reveal where and why performance differed.
The Complete Variance Family
| Variance | Formula | Favorable When | Unfavorable When |
|---|---|---|---|
| Material Price Variance | (Std Price − Act Price) × Act Qty Purchased | Paid less per unit than standard | Paid more per unit than standard |
| Material Usage Variance | (Std Qty − Act Qty) × Std Price | Used less material than standard | Used more material than standard |
| Labor Rate Variance | (Std Rate − Act Rate) × Act Hours | Paid lower wage than standard | Paid higher wage than standard |
| Labor Efficiency Variance | (Std Hours − Act Hours) × Std Rate | Worked fewer hours than standard | Worked more hours than standard |
| Overhead Spending Variance | Budget OH − Actual OH | Spent less than budget | Spent more than budget |
| Overhead Volume Variance | Applied OH − Budget OH | Produced more than planned | Produced less than planned |
Comprehensive Variance Analysis: ProBolt Manufacturing
Standard cost per unit: 3 lbs aluminum @ $5/lb + 0.5 labor hrs @ $20/hr = $25 material + $10 labor = $35/unit
Actual production: 1,000 units | Actual material: 3,100 lbs @ $4.90/lb | Actual labor: 490 hrs @ $21/hr
| Variance | Calculation | Result | Interpretation |
|---|---|---|---|
| Material Price | ($5.00−$4.90) × 3,100 lbs | $310 Favorable | Negotiated better material price |
| Material Usage | (3,000−3,100) × $5.00 | ($500) Unfavorable | Used 100 lbs more than standard — possible waste |
| Labor Rate | ($20−$21) × 490 hrs | ($490) Unfavorable | Used more expensive (senior?) workers |
| Labor Efficiency | (500−490) × $20 | $200 Favorable | Worked 10 fewer hours than standard — efficient! |
| Net Variance | ($480) Unfavorable | Actual cost $35,480 vs standard $35,000 |
Standard costing enables ‘management by exception’ — managers focus attention only on variances that exceed acceptable thresholds (e.g., >5%). Favorable variances can be just as important to investigate as unfavorable ones: a favorable material price variance might mean lower-quality materials are being bought, which could cause production problems downstream.
Standard Costing & Variance Analysis Worksheet — Download, print, and complete to reinforce this lesson.