Variable Overhead Rate Variance Calculator
Total direct labor hours or machine hours incurred.
The total dollar amount actually spent on variable overhead.
The budgeted rate per unit of allocation base.
Actual Rate (per hour):
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Standard Cost for Actual Hours:
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Variance Amount:
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Result Status:
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How is the Variable Overhead Rate Variance Calculated?
The Variable Overhead Rate Variance (often referred to as the Variable Overhead Spending Variance) is a standard costing metric used by management accountants to evaluate cost control performance. It measures the difference between the actual cost incurred for variable overheads and the standard cost that should have been incurred, based on the actual activity level (typically direct labor hours or machine hours).
Formula:
Rate Variance = (Actual Rate – Standard Rate) × Actual Hours
Alternative Formula:
Rate Variance = Total Actual Variable Overhead – (Standard Rate × Actual Hours)
Rate Variance = (Actual Rate – Standard Rate) × Actual Hours
Alternative Formula:
Rate Variance = Total Actual Variable Overhead – (Standard Rate × Actual Hours)
Understanding the Components
- Actual Hours (AH): The actual volume of the allocation base (e.g., hours worked) used during the period.
- Actual Rate (AR): Calculated by dividing the Total Actual Variable Overhead Cost by the Actual Hours.
- Standard Rate (SR): The predetermined overhead rate typically established at the beginning of the year during the budgeting process.
Interpreting the Results
Once calculated, the variance is classified as either Favorable or Unfavorable:
- Unfavorable Variance: This occurs when the actual rate is higher than the standard rate (the result is positive). It implies the company spent more on variable overheads (like indirect materials, utilities, or maintenance) per hour of activity than planned.
- Favorable Variance: This occurs when the actual rate is lower than the standard rate (the result is negative). It implies the company spent less per hour of activity than planned, indicating cost savings.
Example Calculation
Imagine a manufacturing company with the following data:
- Standard Variable Overhead Rate: $10.00 per machine hour.
- Actual Machine Hours Worked: 2,500 hours.
- Total Actual Variable Overhead Costs: $26,000.
First, calculate the Actual Rate: $26,000 / 2,500 hours = $10.40 per hour.
Next, apply the variance formula:
($10.40 – $10.00) × 2,500 hours = $0.40 × 2,500 = $1,000
Since the actual rate ($10.40) was higher than the standard ($10.00), the $1,000 variance is Unfavorable.
Causes of Variance
An unfavorable variable overhead rate variance might be caused by:
- Increases in the price of indirect materials.
- Inefficient use of indirect labor.
- Unexpected utility rate hikes.
- Lack of preventive maintenance leading to higher repair costs.