What Is Yield Variance?
Yield variance is the difference between actual output and standard output of a production or manufacturing process, based on standard inputs of materials and labor. The yield variance is valued at standard cost. Yield variance is generally unfavorable, where the actual output is less than the standard or expected output, but it can be that output expects expectations as well.
- Yield variance measures the difference between actual output and standard output of a production or manufacturing process.
- It contrasts with mix variance, which is the difference in overall material usage.
- Yield variance will be above or below zero if a firm overestimates or underestimates how much material it takes to generate a certain amount.
Yield Variance=SC∗(Actual Yield − Standard Yield)where:SC = Standard unit cost
How to Calculate Yield Variance
Yield variance is calculated as the actual yield minus the standard yield multiplied by standard unit cost.
What Does Yield Variance Tell You?
Yield variance is a common financial and operational metric within manufacturing industries. To improve or enhance the measure, it's fairly regular for an analyst to adjust inputs for special scenarios. For instance, during a raw material price spike, it may not make sense to use temporary price inputs experiencing short-term jumps in prices, as these results would be distorted from normal levels. Here, like any other analysis, it is part art and science.
Generally, yield variance uses direct materials, which are raw materials that are made into finished products. These are not materials used in the production process. Direct materials are goods that physically become the finished product at the end of the manufacturing process. In other words, these are the tangible pieces or components of a finished product.
If a firm overestimates or underestimates how much material it requires to take to generate a certain amount, the material's yield variance will be less than or greater than zero. If the standard quantity is equal to the quantity actually used, then the variance will be zero.
If the direct materials yield variance proves that the company is producing less than originally planned for a given level of input, the company can review their operations for ways to become more efficient. Intuitively, producing more products with the same level of inventory while keeping quality constant can help the organization improve profitability.
Example of How to Use Yield Variance
If 1,000 units of a product are the standard output based on 1,000 kilograms of materials in an 8-hour production unit, and the actual output is 990 units, there is an unfavorable yield variance of 10 units (1,000 - 990). If the standard cost is $25 per unit, the unfavorable yield variance would be $250 (10 x $25).
Or consider company ABC, which will produce 1,000,000 units of a toy for every 1,500,000 units of specialized plastic parts. In its most recent production run, Company ABC used 1,500,000 plastic units, but only produced 1,250,000 toys. The cost of plastic units is $0.50 per unit. The yield variance is:
- (1.25M actual toy output - 1.5M expected toy output) * $0.50 per unit cost = $125,000 unfavorable yield variance
The Difference Between Yield Variance and Mix Variance
Yield variance is a measure of the difference in output. Meanwhile, mix variance is the difference in overall material usage or inputs. Specifically, material usage can vary because a mix of products or inputs is used, which are different from the standard mix.
Limitations of Using Yield Variance
While a yield variance may tell you whether or not your output is efficient or as expected, it can’t tell you why the variance occurred or what contributed to it.