ACC 311 Module 3 Process Costing Assignment Example

Forming Department Production Cost Report for March: Weighted-Average Process Costing on a Steel Moldboard Line

[Student Name]

Southern New Hampshire University

ACC 311: Cost Accounting

Module Three Assignment

[Instructor Name]

[Date]

The organization, setting and figures below are a composite written as a model document. No real employer, client, colleague or patient is described.

Forming Department Production Cost Report for March: Weighted-Average Process Costing on a Steel Moldboard Line

Introduction

Next to its custom job shop, Kettle River Truck Equipment runs a continuous line that cuts, forms and paints steel plow moldboards. Unlike a municipal truck, one moldboard is identical to the next, so the shop cannot and need not trace costs to each unit. Several hundred blades move through the presses each month, and a job cost sheet for every one would cost more to keep than it could ever tell the owner. Instead it accumulates costs by department each month and spreads them across the units produced, which is process costing (Datar & Rajan, 2021). This report covers the forming department for March using the weighted-average method. Steel plate is added at the start of forming, so ending units are complete for materials; conversion costs, labor and overhead, are added evenly as units move through the presses.

Step 1: Physical Flow of Units

Table 1. Physical Units, Forming Department, March

The 1,000 units to account for equal the 1,000 units accounted for, so the flow is complete before any cost is assigned.

Step 2: Equivalent Units

Under the weighted-average method, equivalent units equal units completed plus the equivalent work in ending inventory; the work done last month on beginning inventory is not separated out.

Table 2. Equivalent Units, Weighted-Average Method

Step 3: Cost per Equivalent Unit

Table 3. Costs to Account For and Cost per Equivalent Unit

Step 4: Assigning Costs

Table 4. Assignment of Costs

The $688,910 accounted for equals the $688,910 to account for, so the report reconciles. The $615,760 moves to the painting department as transferred-in cost, and the $73,150 remains on the balance sheet as forming department work in process.

In the general ledger, March's activity is recorded in three summary entries. Steel plate requisitioned to forming is debited to Work in Process, Forming, and credited to Raw Materials for $404,000. Labor and overhead are debited to the same account for $221,310, with credits to Wages Payable and Manufacturing Overhead. Finally, Work in Process, Painting, is debited and Work in Process, Forming, credited for the $615,760 of completed moldboards. After those entries the forming account carries a debit balance of $73,150, which agrees with the ending inventory figure in Table 4 and gives the controller a quick check that the report and the ledger tell the same story.

What the Weighted Average Hides

The weighted-average cost of $458 per unit for materials blends February's steel, carried in beginning inventory, with March's purchases. A FIFO calculation isolates March. Under FIFO, materials equivalent units for March's work are the 740 units started and completed plus the 140 in ending inventory, or 880, and conversion equivalent units are 72 to finish beginning inventory, plus 740, plus 35, or 847.

Table 5. FIFO Cost per Equivalent Unit for March Work Only

The FIFO figures are higher than the weighted averages, which means March's costs per unit rose compared with the work carried over from February. Beginning inventory carried materials at $450 per unit ($54,000 divided by 120), while March's plate cost about $459, an increase of roughly 2 percent that reflects a mid-season rise in steel prices. Conversion cost per unit also rose, partly because a press was down for two days of repairs. During those two days, operators and supervision were still paid and the building was still heated, but fewer units moved through the presses, so the fixed part of conversion cost was spread across less output. That is a reminder that cost per equivalent unit is not only a price signal; it also reflects how well the line ran. Labro (2019) observes that the choice of costing method shapes what managers can see; here the weighted average smooths over a price trend that the purchasing manager needs to know about before signing the dealer price list for next season. Kaplan and Cooper (1998) made the broader case that people running operations need cost figures that are more frequent and more current than those built for financial statements, and a monthly FIFO check on this line is a small, cheap step in that direction.

Conclusion

The forming department transferred 860 moldboards to painting at $716 per unit, a total of $615,760, and carried $73,150 in ending work in process, with the report fully reconciled. Weighted-average costing suits the line because units are identical and the method is simple to maintain, but the FIFO comparison is worth running each month during volatile steel markets. A cost increase of a few dollars per unit across thousands of dealer moldboards becomes a pricing question that the shop should answer before, not after, the season.

Two limits of this report should be noted. The percentages of completion for ending inventory are estimates made by the forming supervisor at month end, and an estimate of 35 percent instead of 25 percent would move roughly $3,400 out of transferred-out cost and into ending inventory, because the 140 unfinished units would claim 49 equivalent units of conversion instead of 35. And the report treats every moldboard as identical, which holds for the standard 11-foot blade but not for the small run of 12-foot blades formed for one dealer in late March. If longer blades become a regular product, the shop should consider an operation costing approach, which keeps process costing for conversion but traces the different plate sizes to each batch.

References

Datar, S. M., & Rajan, M. V. (2021). Horngren's cost accounting: A managerial emphasis (17th ed.). Pearson.

Kaplan, R. S., & Cooper, R. (1998). Cost and effect: Using integrated cost systems to drive profitability and performance. Harvard Business School Press.

Labro, E. (2019). Costing systems. Foundations and Trends in Accounting, 13(3-4), 267-404. https://doi.org/10.1561/1400000058