Managerial/Cost Accounting | Horngren/Datar/Rajan, 14e | Objectives 16.5–16.7
Difficulty: Intermediate | Prerequisites: Parts 1 and 2 of these notes (joint cost fundamentals and the four allocation methods).
Once you know how to allocate joint costs, two practical questions remain. First, should a product be sold at the splitoff point or processed further? This is a classic relevant-cost decision. Second, how should low-value byproducts be handled in the accounting records? This section covers both, completing the Chapter 16 toolkit.
The sell-or-process-further decision ignores joint costs entirely (they are sunk) and compares only incremental revenue against incremental cost beyond the splitoff point. Process further only if incremental operating income is positive. For byproducts, two accounting methods exist: the production method (recognises byproducts when produced, offsets joint costs) and the sales method (recognises byproducts only when sold). The production method better matches costs and revenues.
Sell-or-process-further decision
The decision whether to sell a joint product at the splitoff point or to incur additional costs to process it into a different, higher-priced product. The decision turns on whether the incremental revenue exceeds the incremental cost.
In simple terms, will you earn more by doing more work on the product, or should you sell it as it is?
Incremental revenue
The additional revenue earned by processing a product further, beyond what it would sell for at the splitoff point.
Incremental cost
The additional cost incurred to process a product further after the splitoff point. Not all separable costs are incremental; some may be fixed.
Production method (byproduct accounting)
Recognises byproducts in the financial statements at the time production is completed. The estimated net realisable value of the byproduct is offset against the costs of the main or joint products, reducing cost of goods sold.
In simple terms, you credit the byproduct's value against manufacturing costs as soon as it is produced.
Sales method (byproduct accounting)
Delays recognition of byproducts until they are sold. Revenue can be recorded as a line item in the income statement or as a reduction of cost of goods sold.
In simple terms, you ignore the byproduct until cash comes in.
Compare the incremental revenue from further processing with the incremental cost of further processing.
If incremental revenue exceeds incremental cost, process further.
If incremental cost exceeds incremental revenue, sell at splitoff.
Joint costs are irrelevant to this decision. They are sunk costs, incurred regardless of what happens after the splitoff point.
Joint costs do not differ between the alternatives (sell now vs. process further). Only costs that differ between alternatives are relevant.
The total amount of joint costs and the portion allocated to individual products have no bearing on the decision.
New York Liberty Corporation makes polished statues that sell for $18 each. Engraving costs an additional $5 per statue, and engraved statues sell for $30.
Incremental revenue from engraving: $30 minus $18 = $12
Incremental cost of engraving: $5
Incremental operating income: $12 minus $5 = $7 per statue
Decision: engrave, because the $7 incremental profit exceeds zero.
Not all separable costs are incremental. Some separable costs may be fixed (e.g., a lease on processing equipment) and therefore not relevant to a short-run decision.
If managers use an incremental revenue/incremental cost approach, all three market-based allocation methods (sales value at splitoff, estimated NRV, constant gross-margin % NRV) will show each product with a positive or zero operating income on the budgeted product-line income statement.
Selling prices are the factor that most often drives joint cost allocation in practice.
Byproducts can be recognised in the general ledger either at the time production is completed or at the time of sale.
Recognises byproducts when production is completed.
The estimated NRV of the byproduct produced is offset against the costs of the main or joint products.
The byproduct appears on the balance sheet as inventory at its selling price.
This method is consistent with the matching principle: costs and revenues are recognised in the same period.
It is the conceptually preferred method.
Makes no journal entries until the byproduct is sold.
When sold, byproduct revenue can be recorded either as a separate revenue line item in the income statement, or as a reduction of cost of goods sold.
Revenues could be recorded in one accounting period while the related expense was recorded in an earlier period.
No ending inventory is reported for the byproduct.
It matches the cost recognition with the period of production.
The sales method allows managers to time earnings by choosing when to sell byproducts. They have an incentive to stockpile byproducts and sell them in a period when they want to boost reported earnings.
Carolina Company produces 80,000 board feet of lumber ($6.00/ft, total $480,000 revenue) and 6,800 lbs of shavings ($0.60/lb) with total manufacturing costs of $332,000.
Under the production method: byproduct revenue = 6,800 x $0.60 = $4,080. COGS = $332,000 minus $4,080 = $327,920. Gross margin = $480,000 minus $327,920 = $152,080.
Under the sales method: sales = $480,000 + $4,080 = $484,080. COGS = $332,000. Gross margin = $484,080 minus $332,000 = $152,080.
Both methods produce the same gross margin when all byproducts are sold in the same period.
The sell-or-process-further decision arises constantly in food processing (sell raw cuts or make value-added products), chemical manufacturing (sell intermediates or refine them), and timber (sell rough lumber or plane and finish it). Byproduct accounting matters anywhere a low-value residual has a market: sawdust sold to particle-board manufacturers, whey from cheese production sold to supplement companies, or slag from steelmaking sold to road builders.
Students often think joint costs should influence the sell-or-process-further decision. They should not. Joint costs are sunk and irrelevant.
Students sometimes believe joint processing costs are always relevant for pricing the final product. They are only relevant when they differ between alternatives.
Students assume all separable costs are incremental. Some separable costs are fixed and therefore not relevant to the short-run decision.
Students confuse the two byproduct methods and think the sales method is preferred because it is simpler. The production method is preferred because it matches costs and revenues.
⚠️ The sell-or-process-further decision is a favourite exam question. Remember: compare incremental revenue to incremental cost. Joint costs are irrelevant.
⚠️ Know both byproduct accounting methods cold. Be ready to prepare an income statement under each method and to explain why the production method is preferred.
⚠️ Understand that the sales method creates an incentive for managers to manipulate earnings by timing byproduct sales.
⚠️ The physical-measure method should not be used to eliminate conflicts between decision-making and performance evaluation. The three market-based methods can.
True or false: Joint costs are relevant to the sell-or-process-further decision. False. They are sunk costs.
Fill in the blank: Process further only if incremental ________ exceeds incremental ________. Revenue; cost (or: operating income is positive).
True or false: The production method for byproducts recognises them at the time of sale. False. It recognises them when production is completed.
Fill in the blank: Under the sales method, managers can manipulate earnings by timing the ________ of byproducts. Sale.
True or false: Both byproduct methods produce the same gross margin when all byproducts are sold in the period they are produced. True.
Q: When a product is the result of a joint process, the decision to process it further should be influenced by what?
A: The extra operating income earned past the splitoff point (incremental revenue minus incremental cost). The total amount of joint costs and their allocation are irrelevant.
Q: Polished statues sell for $18. Engraving costs $5 per statue and engraved statues sell for $30. Should the company engrave?
A: Yes. Incremental revenue = $30 minus $18 = $12. Incremental cost = $5. Incremental operating income = $7 per statue.
Q: Athens Company produces 4,375 gallons of byproduct X at $8/gallon and 10,000 gallons of main product Y at $100/gallon. Manufacturing costs are $30,000. Under the production method, what is the byproduct's net revenue reduction to COGS?
A: Byproduct X produced = 4,375 gallons. NRV at production = 4,375 x $8 = $35,000. This $35,000 reduces the COGS of the main product. (Note: if only 4,000 gallons are sold, the 375 remaining are held as byproduct inventory.)
Q: What are the two methods of accounting for byproducts, and which is preferred?
A: The production method (recognises byproducts when produced) and the sales method (recognises them when sold). The production method is preferred because it is consistent with the matching principle and does not allow managers to manipulate earnings by timing sales.
Q: A negative consequence of recording byproducts at the point of sale is what?
A: Managers can time earnings by choosing when to sell byproducts, and they have an incentive to stockpile byproducts to boost earnings in a later period.
The sell-or-process-further decision is a direct application of the relevant-cost framework from Chapter 11 (decision-making and relevant information). Byproduct accounting connects to financial accounting principles, particularly the matching principle and revenue recognition. The earnings-management risk in the sales method ties into managerial ethics and internal controls covered in auditing and governance courses.
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