Ch12. Cost Budgets & Variance Analysis — Fixed Budgets, Flexible Budgets, Price Variance, and Efficiency Variance

Why Split Budgets Into Types?

The most common illusion in cost accounting is concluding “actual costs exceeded budget → performance was bad.” But if production volume increased, it would be natural for total costs to exceed the original plan. Effective cost control begins with distinguishing between a fixed budget and a flexible budget.

1. Fixed Budget (Static Budget)

A fixed budget is prepared for a single assumed activity level.

Example: budget prepared assuming 1,000 units of monthly production

Strengths

Simple to create.
Provides a clear baseline.

Limitations

When actual output differs, comparisons become distorted.
Impossible to separate cost increases due to volume from cost increases due to inefficiency.

2. Flexible Budget

A flexible budget recalculates the plan using the actual activity level.

Flexible Budget = budget recomputed at the actual production volume achieved

If production was 1,200 units instead of the planned 1,000, the flexible budget asks: what should costs have been for 1,200 units?

Why it matters

Only by using a flexible budget can you separate:

Variances caused by changes in volume
Variances caused by poor cost control

3. The Overall Variance Structure

Cost variance analysis is typically layered as follows:

Static Budget Variance
= Actual Cost − Fixed Budget Cost

Volume Variance
= Flexible Budget Cost − Fixed Budget Cost

Controllable Variance
= Actual Cost − Flexible Budget Cost

This structure lets you explain why a variance occurred — step by step.

4. Static Budget Variance

The static budget variance is the broadest, first-pass comparison.

Static Budget Variance = Actual Cost − Fixed Budget Cost

On its own, this figure cannot tell you whether cost overruns resulted from:

Higher production volume, or
Operational inefficiency

That is why management accounting goes further.

5. Volume Variance

The volume variance captures the difference caused by actual activity differing from plan.

Volume Variance = Flexible Budget Cost − Fixed Budget Cost

If planned production was 1,000 units but actual was 1,200, the additional cost of producing those extra units is natural — not a failure of cost control. Labeling this portion “inefficiency” distorts performance evaluation.

6. Price Variance and Efficiency Variance

Standard costing drills down further and typically splits variances into two components.

Price Variance

Price Variance = Actual Quantity × (Standard Price − Actual Price)

Driven by purchasing conditions, unit-price negotiations, and raw material market movements.

Efficiency Variance

Efficiency Variance = Standard Price × (Standard Quantity Allowed − Actual Quantity Used)

If more materials or labor were consumed than standard to produce the same output, efficiency has declined.

Efficiency variance answers “how wastefully were inputs used?” rather than “how expensive were inputs?“

7. Real-World Reporting Flow

A manager receiving a variance report typically works through these layers:

Total variance vs. fixed budget
Identify how much is explained by volume difference
Examine controllable variance vs. flexible budget
Break down into price variance and efficiency variance
Assign to responsible departments

Variance	Primary responsibility
Price variance	Purchasing department
Efficiency variance	Production department
Volume variance	Demand planning / production scheduling

8. Practical Intuition

The same “unfavorable” variance can mean very different things:

Unfavorable price variance: rising raw material prices, failed negotiations, emergency procurement
Unfavorable efficiency variance: skill gaps, equipment inefficiency, rising defect rates
Unfavorable volume variance: actual production significantly below plan, spreading fixed costs more thinly

Variance analysis is not just a tool for assigning blame — it is a map for finding root causes.

Key Concept Cards

Fixed Budget vs. Flexible Budget ★★★★★
Fixed budget uses planned activity level; flexible budget uses actual activity level. The starting point for all variance analysis.

Volume Variance ★★★★★
The variance explained by production volume differing from plan. Must be separated from controllable failures.

Efficiency Variance ★★★★☆
Shows whether more inputs were consumed than the standard allows for a given output level. The key signal of on-the-floor operational efficiency.

Practice Quiz

Q. Actual cost exceeded the fixed budget, but the flexible-budget variance was favorable. What does this mean?

Production volume exceeded the plan, so total cost naturally rose — but relative to the actual level of activity, costs were controlled better than planned. Volume drove the overrun, not inefficiency.

Q. An unfavorable efficiency variance persists across multiple months. What is the first thing to investigate?

The root cause of excess input consumption. Common starting points: defect rate, equipment condition, worker skill levels, and process design flaws.