13 Akuntansi Biaya Activity Based Costing

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13 Akuntansi Biaya Activity Based Costing Diah Iskandar SE., M.Si dan Nurul Hidayah,SE,Ak,MSi FEB Akuntansi

Data biaya langsung produk 8-2 Data biaya langsung produk Langkah 1 adalah menghitung biaya langsung tiap produk dan total penjualan. One of the most common management reports prepared with ABC data is product profitability (product margin) reports. The first step in computing product margins is to gather each product’s sales and direct cost data which are assumed to be as shown.

8-3 Langkah ke 2 memasukkan BOP, berdasarkan activity-based cost untuk tiap2 produk. The second step is to incorporate the previously computed activity-based cost assignments pertaining to each product.

8-4 Langkah ke 3 menghitung marjin produk dengan mengurangkan penjualan dg biaya. The third step is to compute product margins ($906,250 for standard stanchions and a loss of $49,500 for custom compass housings) by deducting each product’s direct and indirect costs from its sales.

8-5 Menghitung Laba/rugi bersih marjin produk di kurangi dengan biaya non produksi: The product margins can be reconciled with the company’s net operating loss as shown.

Perhitungan biaya dengan menggunakan Traditional Cost System 8-6 Perhitungan biaya dengan menggunakan Traditional Cost System Langkah 1, menghitung biaya produk langsung. The first step is to gather each product’s sales and direct cost data as shown.

Menghitung total biaya overhead berdasarkan Traditional Cost System 8-7 Menghitung total biaya overhead berdasarkan Traditional Cost System Menghitung tarip BOP, dan alokasi ke tiap2 produk The second step is to compute the plantwide overhead rate. Notice: The numerator is the $1,000,000 of manufacturing overhead shown earlier. The denominator is the 20,000 machine hours used for the order size activity from the ABC system. The plantwide overhead rate is $50 per machine-hour. Plantwide manufacturing overhead rate $1,000,000 20,000 MH = $50 per machine-hour =

Alokasi BOP ke tiap-tiap produk : 8-8 Alokasi BOP ke tiap-tiap produk : 17,500 hours × $50 per hour = $875,000 The third step is to allocate manufacturing overhead to each product. Notice: 17,500 machine-hours were worked on standard stanchions, so $875,000 (17,500 hours × $50) of manufacturing overhead is assigned to this product. Custom compass housings are assigning the remaining $125,000 (2,500 × $50) of manufacturing overhead. By: Garrison Noreen

Product Margins Computed Using the Traditional Cost System 8-9 Product Margins Computed Using the Traditional Cost System The fourth step is to actually compute the product margins. The fourth step is to compute the product margins—$615,750 for standard stanchions and $258,000 for custom compass housings. Notice selling and administrative expenses are not allocated to products because they are assumed to be period expenses. The overall net loss of $1,250 reconciles with the income statement shown earlier.

Perbedaan tradisional dengan ABC 8-10 Perbedaan tradisional dengan ABC The traditional cost system overcosts the standard stanchions and reports a lower product margin for this product. The traditional cost system undercosts the custom compass housings and reports a higher product margin for this product. The changes in product margins caused by switching from the traditional cost system to the activity-based costing system are as shown. Notice: The traditional cost system overcosts the standard stanchions, and consequently, reports an artificially low product margin for this product. Conversely, the traditional cost system undercosts the custom compass housings, and consequently, reports an artificially high product margin for this product.

8-11 There are three reasons why the reported product margins for the two costing systems differ from one another. Traditional costing allocates all manufacturing overhead to products. ABC costing only assigns manufacturing overhead costs consumed by products to those products. There are three reasons why the reported product margins for the two costing systems differ from one another.  The traditional cost system allocates all manufacturing overhead to products. The ABC system only assigns manufacturing overhead costs consumed by products to those products. More specifically, the ABC system does not assign the manufacturing overhead costs consumed by the customer relations activity to products because these costs are caused by customers, not specific products. The ABC system does not assign the manufacturing overhead costs included in the “other” activity to products because these organization-sustaining and unused capacity costs are not caused by products.

Differences Between ABC and Traditional Product Costs 8-12 Differences Between ABC and Traditional Product Costs There are three reasons why the reported product margins for the two costing systems differ from one another.  Traditional costing allocates all manufacturing overhead costs using a volume-related allocation base. ABC costing also uses non-volume related allocation bases. The second reason why the reported product margins for the two costing systems differ from one another is:  The traditional cost system allocates all manufacturing overhead costs using a volume-related allocation base (machine-hours). The ABC system uses volume- related and non-volume related allocation bases to assign manufacturing overhead to products. More specifically, the traditional cost system allocates 87.5% of all manufacturing overhead to standard stanchions and 12.5% to custom compass housings. The ABC system assigns 60% and 40% of customer orders activity cost (a batch-level cost) to standard stanchions and custom compass housings, respectively. The ABC system assigns 0% and 100% of product design activity cost (a product-level cost) to standard stanchions and custom compass housings, respectively.

Differences Between ABC and Traditional Product Costs 8-13 Differences Between ABC and Traditional Product Costs There are three reasons why the reported product margins for the two costing systems differ from one another.  Traditional costing disregards selling and administrative expenses because they are assumed to be period expenses. ABC costing directly traces shipping costs to products and includes nonmanufacturing overhead costs caused by products in the activity cost pools that are assigned to products. The third reason why the reported product margins for the two costing systems differ from one another is:  The traditional cost system disregards selling and administrative expenses because they are assumed to be period expenses. The ABC system directly traces shipping costs to products and includes nonmanufacturing overhead costs caused by products in the activity cost pools that are assigned to products.

Activity-Based Costing and External Reporting 8-14 Activity-Based Costing and External Reporting Most companies do not use ABC for external reporting because . . . External reports are less detailed than internal reports. It may be difficult to make changes to the company’s accounting system. ABC does not conform to GAAP. Auditors may be suspect of the subjective allocation process based on interviews with employees. There are four reasons why most companies do not use ABC for external reporting purposes:  External reports are less detailed than internal reports in the sense that individual product costs are not reported. External reports only disclose cost of goods sold and ending inventory. Therefore, if some products are undercosted and others are overcosted, the errors tend to cancel each other out when the product costs are added together.  It is often very difficult to change a company’s accounting system because it is deeply embedded within complex computer programs that have evolved over many years.  An ABC system, such as the one described in the chapter, does not conform to generally accepted accounting principles (GAAP). It excluded some organization-sustaining manufacturing costs and it included some nonmanufacturing costs in its product cost calculations. These cost system design attributes do not comply with GAAP.  Auditors are likely to be uncomfortable with cost allocations that are based upon interviews with the company’s personnel. This type of subjective data can be easily manipulated by management.

8-15 ABC Limitations Substantial resources required to implement and maintain. Resistance to unfamiliar numbers and reports. Desire to fully allocate all costs to products. Potential misinterpretation of unfamiliar numbers. There are five limitations of activity-based costing:                    Implementing an ABC system requires substantial resources. The benefits of increased cost accuracy may not outweigh the implementation costs.   ABC systems produce numbers, such as product margins, that are at odds with the numbers produced by traditional cost systems. Managers are not accustomed to managing their operations using these numbers; hence, ABC inevitably faces resistance. This underscores the importance of having top management support for and cross-functional involvement with the ABC implementation.  In practice, most managers insist on fully allocating all costs to products. The ABC system described in the main portion of this chapter does not conform to this preference.   ABC systems do not automatically identify the relevant costs for particular decisions; therefore, ABC data can be easily misinterpreted and must be used with care when making decisions. Costs assigned to products, customers, and other cost objects are only potentially relevant.  Most organizations use ABC as a supplement to rather a replacement for their existing cost system. Maintaining two cost systems is costlier than maintaining just one system and it may cause confusion about which set of numbers is to be relied on. Does not conform to GAAP. Two costing systems may be needed.

Shows what costs have been assigned to a cost object. 8-16 Conventional ABC analysis does not identify potentially relevant costs. An action analysis report helps because it: Shows what costs have been assigned to a cost object. Indicates how difficult it would be to adjust those costs in response to changes in the level of activity. A conventional ABC analysis does not identify potentially relevant costs. An action analysis report can help in this regard because it shows what costs have been assigned to a cost object and it indicates how difficult it would be to adjust those costs in response to changes in the level of activity.

8-17 Constructing an action analysis report begins with the first-stage allocation process. In addition to computing an overall activity rate for each activity cost pool, an activity rate is computed for each type of overhead cost that is consumed supporting a given activity. Let’s revisit the stage-one allocations from the Classic Brass example that we discussed earlier. Constructing an action analysis report begins with the first-stage allocation process. In addition to computing an overall activity rate for each activity cost pool, an activity rate is computed for each type of overhead cost that is consumed supporting a given activity. Let’s revisit the stage-one allocations from the Classic Brass example that we discussed earlier in the chapter.

Other entries in the table are computed similarly. 8-18 Part I. Rather than computing one activity rate for each activity cost pool as was done previously (see the bottom of the slide for these rates), an activity rate is computed for each type overhead cost (or for each cell in the matrix). Part II. For example, the customer orders activity has six activity rates that sum to the total of $320 from the conventional ABC analysis. $125,000 ÷ 1,000 orders = $125 per order Other entries in the table are computed similarly.

Other entries in the table are computed similarly. 8-19 The second-stage allocation process requires assigning product costs by each type of overhead cost. In the Classic Brass illustration, there are, for example, six activity cost assignments from the customer orders activity to the standard stanchions. These six assignments total $192,000 as in the conventional ABC analysis. Notice, the total ABC costs assigned to standard stanchions are $524,500, which is the same as in the conventional ABC analysis. $125 per order × 600 orders = $75,000 Other entries in the table are computed similarly.

Other entries in the table are computed similarly. 8-20 As another example, there are four assignments from the product design activity to the custom compass housings. These four assignments total $252,000 as in the conventional ABC analysis. Notice, the total ABC costs assigned to the custom compass housings is $427,500, which is the same as in the conventional ABC analysis. $125 per order × 400 orders = $50,000 Other entries in the table are computed similarly.

Activity-based unit product costs for both product lines 8-21 Activity-based unit product costs for both product lines The activity-based unit product costs for both product lines would be computed as shown.

Activity-based unit product costs for both product lines 8-22 Activity-based unit product costs for both product lines $728,000 ÷ 50,000 units $792,000 ÷ 200,000 units The manufacturing overhead per unit for both products is computed by taking the total overhead assigned to that product and dividing it by the number of units produced.

Comparing the two approaches 8-23 Comparing the two approaches Note that the unit product cost of a Standard unit decreased from $53.70 to $51.96 . . . . . Maxtar Industries – comparing the two approaches The difference in unit product costs between the two methods is as shown. Notice, the ABC unit product cost for the premium (standard) product line is higher (lower) than what was computed using the traditional cost system. This is because: The ABC system contains two non-volume-related cost pools—“setting up machines,” which is a batch-level activity and “parts administration,” which is a product-level activity. The ABC system accurately assigned these costs to products in a way that shifted costs from the high volume product (standard) to the low volume product (premium). . . . . . while the unit cost of a Premium unit increased from $71.60 to $78.56.

Diah dan Nurul