Inventory Management, Just in Time, and Backflush Costing Chapter 20
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1 Inventory Management, Just in Time, and Backflush Costing Chapter
2 Learning Objective 1 Identify five categories of costs associated with goods for sale. 20 2
3 Costs Associated with Goods for Sale 1. Purchasing costs include transportation costs. 2. Ordering costs include receiving and inspecting the items in the orders. 3. Carrying costs include the opportunity cost of the investment tied up in inventory and the costs associated with storage. 20 3
4 Costs Associated with Goods for Sale 4. Stockout costs occur when an organization runs out of a particular item for which there is a customer demand. 5. Quality costs of a product or service is its lack of conformance with a prespecified standard. 20 4
5 Learning Objective 2 Balance ordering costs with carrying costs using the economic order quantity (EOQ) decision model. 20 5
6 Economic Order Quantity Decision Model Assumptions 1. The same quantity is ordered at each reorder point. 2. Demand, ordering costs, carrying costs, and purchase order lead time are known with certainty. 3. Purchasing costs per unit are unaffected by the quantity ordered. 20 6
7 Economic Order Quantity Decision Model Assumptions 4. No stockouts occur. 5. Quality costs are considered only to the extent that these costs affect ordering costs or carrying costs. 20 7
8 Economic Order Quantity Decision Model Assumptions The EOQ minimizes the relevant ordering costs and carrying costs. Video store sells packages of blank video tapes. Video purchases packages of video tapes from Oaks, Inc., at $15/package. 20 8
9 Economic Order Quantity Decision Model Assumptions Annual demand is 12,844 packages, at the rate of 247 packages per week. Video requires a 15% annual return on investment. The purchase order lead time is two weeks. What is the economic order quantity? 20 9
10 Economic Order Quantity Decision Model Assumptions Relevant ordering cost per purchase order: $209 Relevant carrying costs per package per year: Required annual ROI (15% $15) $2.25 Relevant other costs 3.25 Total $
11 Economic Order Quantity Decision Model Example EOQ = 2 D P C D = Demand in units for a specified time period P = Relevant ordering costs per purchase order C = Relevant carrying costs of one unit in stock for the time period used for D 20 11
12 Economic Order Quantity Decision Model Example EOQ = 2 x 12, 844 x $209 $ , 144 = 988 packages 20 12
13 Economic Order Quantity Decision Model Example What are the relevant total costs (RTC)? RTC = Annual relevant ordering costs + Annual relevant carrying costs RTC = D Q P + Q 2 C or DP Q + QC 2 Q can be any order quantity, not just the EOQ
14 Economic Order Quantity Decision Model Example When Q = 988 units, RTC = (12,844 $ ) + (988 $5.50 2) = $5,434 total relevant costs How many deliveries should occur each time period? D EOQ 12,844 = 988 = 13 deliveries 20 14
15 Economic Order Quantity 10,000 Decision Model Example Relevant Total Costs (Dollars) 8,000 6,000 5,434 4,000 2,000 Annual relevant carrying costs Annual relevant total costs Annual relevant ordering costs Order Quantity (Units) ,200 1,800 2,400 EOQ 20 15
16 Reorder Point Reorder point = Number of units sold per unit of time Purchase order lead time EOQ = 988 packages Number of units sold/week = 247 Purchase order lead time = 2 weeks Reorder point = = 494 packages 20 16
17 Reorder Point 988 Reorder Point Reorder Point 494 Weeks This exhibit assumes that demand and purchase order lead time are certain: Demand = 247 tape packages/week Lead Time 2 weeks Lead Time 2 weeks Purchase order lead time = 2 weeks 20 17
18 Safety Stock Example Safety stock is inventory held at all times regardless of the quantity of inventory ordered using the EOQ model. Video s expected demand is 247 packages per week. Management feels that a maximum demand of 350 packages per week may occur
19 Safety Stock Example How much safety stock should be carried? 350 Maximum demand 247 Expected demand = 103 Excess demand per week 103 packages 2 weeks lead time = 206 packages of safety stock
20 Considerations in Obtaining Estimates of Relevant Costs What are the relevant incremental costs of carrying inventory? only those costs of the purchasing company that change with the quantity of inventory held 20 20
21 Cost of Prediction Error Predicting relevant costs requires care and is difficult. Assume that Video s relevant ordering cost is $97.84 instead of the $209 prediction used. What is the cost of this prediction error? 20 21
22 Cost of Prediction Error Step 1: Compute the monetary outcome from the best action that could have been taken, given the actual amount of the cost input. EOQ = 2 x 12844, x $5. 50 EOQ = 456, 966 = 676 packages 20 22
23 Cost of Prediction Error The annual relevant total costs when EOQ is 676 packages is: RTC = DP Q + QC 2 RTC = (12,844 $ ) + (676 $5.50 2) = $3,718 total relevant costs 20 23
24 Cost of Prediction Error Step 2: Compute the monetary outcome from the best action based on the incorrect amount of the predicted cost input. EOQ = 2 x 12, 844 x $209 $5. 50 = 988 packages 20 24
25 Cost of Prediction Error What are the annual relevant costs using this order quantity when D = 12,844 units, P = $97.84, and C = $5.50? RTC = (12,844 $ ) + (988 $5.50 2) = $ 3,989 total relevant costs 20 25
26 Cost of Prediction Error Step 3: Compute the difference between the monetary outcomes from Steps 1 & 2. Step 1 $3,718 Step 2 3,989 Difference $ (271) The cost of prediction error is $
27 Learning Objective 3 Identify and reduce conflicts that can arise between EOQ decision model and models used for performance evaluation
28 Evaluating Managers and Goal Congruence Issues The opportunity cost of investment tied up in inventory is a key input in the EOQ decision model. Some companies now include opportunity costs as well as actual costs when evaluating managers
29 Just In Time Purchasing Just in time (JIT) purchasing is the purchase of goods or materials such that a delivery immediately precedes demand or use. Companies moving toward JIT purchasing argue that the cost of carrying inventories (parameter C in the EOQ model) has been dramatically underestimated in the past
30 JIT Purchasing and EOQ Model Parameters The cost of placing a purchase order (parameter P in the EOQ model) is also being re evaluated. Three factors are causing sizable reduction in the cost of placing a purchase order (P). 1. Companies increasingly are establishing long run purchasing arrangements
31 JIT Purchasing and EOQ Model Parameters 2. Companies are using electronic links, such as the Internet, to place purchase orders. 3. Companies are increasing the use of purchase order cards (similar to consumer credit cards like Visa and Master Card)
32 Learning Objective 4 Use a supply chain approach to inventory management
33 Supply Chain Analysis Supply chain analysis describes the flow of goods, services, and information from cradle to grave, regardless of whether those activities occur in the same organization or other organizations. bullwhip effect or whiplash effect 20 33
34 Learning Objective 5 Differentiate materials requirements planning (MRP) systems from just in time (JIT) systems for manufacturing
35 Materials Requirement Planning (MRP) Materials requirements planning (MRP) systems take a push through approach that manufactures finished goods for inventory on the basis of demand forecasts. MRP predetermines the necessary outputs at each stage of production
36 Materials Requirement Planning (MRP) Management accountants play key roles in an MRP system, including... maintaining accurate and timely information pertaining to materials, work in process, and finished goods, and... providing estimates of the setup costs for each production run, the downtime costs, and carrying costs of inventory
37 Learning Objective 6 Identify the features of a just in time production system
38 Just In Time Production Systems Just in time (JIT) production systems take a demand pull approach in which goods are only manufactured to satisfy customer orders
39 Major Features of a JIT System 1. Organizing production in manufacturing cells 2. Hiring and retaining multi skilled workers 3. Emphasizing total quality management 4. Reducing manufacturing lead time and setup time 5. Building strong supplier relationships 20 39
40 Major Features of a JIT System What information may management accountants use? Personal observation by production line workers and managers Financial performance measures, such as inventory turnover ratios Nonfinancial performance measures of time, inventory, and quality
41 Learning Objective 7 Use backflush costing
42 Backflush Costing Backflush costing describes a costing system that delays recording some or all of the journal entries relating to the cycle from purchase of direct materials to the sale of finished goods
43 Backflush Costing Where journal entries for one or more stages in the cycle are omitted, the journal entries for a subsequent stage use normal or standard costs to work backward to flush out the costs in the cycle for which journal entries were not made
44 Learning Objective 8 Describe different ways backflush costing can simplify traditional job costing systems
45 Trigger Points The term trigger point refers to a stage in a cycle going from purchase of direct materials to sale of finished goods at which journal entries are made in the accounting system
46 Trigger Points Stage A: Purchase of direct materials Stage B: Production resulting in work in process Stage C: Completion of good units of product Stage D: Sale of finished goods 20 46
47 Trigger Points Assume trigger points A, C, and D. This company would have two inventory accounts: Type 1. Combined materials and materials in work in process inventory 2. Finished goods Account Title 1. Inventory: Raw and In process Control 2. Finished Goods Control 20 47
48 Trigger Points What is the journal entry when trigger point A occurs? Inventory: Raw and In process Control XX Accounts Payable Control XX To record direct material purchased during the period 20 48
49 Trigger Points What is the journal entry to record conversion costs? Conversion Costs Control XX Various accounts XX To record the incurrence of conversion costs during the accounting period Underallocated or overallocated conversion costs are written off to cost of goods sold
50 Trigger Points What is the journal entry when trigger point C occurs? Finished Goods Control XX Inventory: Raw and In Process Control XX Conversion Costs Allocated XX To record the cost of goods completed during the accounting period 20 50
51 Trigger Points What is the journal entry when trigger point D occurs? Cost of Goods Sold XX Finished Goods Control To record the cost of goods sold during the accounting period XX 20 51
52 Trigger Points Assume trigger points A and D. This company would have one inventory account: Type Combines direct materials inventory and any direct materials in work in process and finished goods inventories Account Title Inventory Control 20 52
53 Trigger Points What is the journal entry when trigger point A occurs? Inventory: Raw and In process Control XX Accounts Payable Control XX To record direct material purchased during the period Same as the A, C, and D example
54 Trigger Points What is the journal entry to record conversion costs? Conversion Costs Control XX Various accounts XX To record the incurrence of conversion costs during the accounting period Same as the A, C, and D example
55 Trigger Points What is the journal entry to record the cost of goods completed during the accounting period (trigger point C)? No journal entry
56 Trigger Points What is the journal entry when trigger point D occurs? Cost of Goods Sold XX Inventory Control Conversion Costs Allocated To record the cost of goods sold during the accounting period XX XX 20 56
57 End of Chapter
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