Net Realizable Value Method

The Net Realizable Value Method splits joint production costs among multiple outputs in proportion to what each product will eventually sell for, minus any costs incurred after the split-off point. It is one of the most theoretically sound approaches to cost-allocation in multi-product manufacturing and is widely used in industries where further processing is common.

The core logic

When a single manufacturing process yields multiple products—as happens in oil refining, meat packing, or dairy operations—the question is how to charge each output its fair share of the joint expense. The net realizable value method answers: charge each product in proportion to the revenue it will generate.

A refinery processes crude oil and obtains gasoline, diesel, and kerosene at the split-off point. Gasoline is sold as-is; diesel requires hydrotreating; kerosene is blended with additives. Each product’s net realizable value is its eventual selling price minus the cost of that further processing. If gasoline sells for $1.20/litre with no additional processing cost, diesel for $1.10/litre after $0.15/litre of treatment, and kerosene for $1.05/litre after $0.08/litre of blending, their net realizable values are $1.20, $0.95, and $0.97 respectively. The joint costs are then allocated in the ratio of these values: 1.20 : 0.95 : 0.97.

Why it is theoretically stronger than alternatives

The physical-quantity-method allocates by weight or volume, ignoring the fact that 1,000 litres of premium gasoline and 1,000 litres of heavy fuel oil have vastly different economic worth. The relative-sales-value-method uses only the value at split-off, ignoring further processing costs. The net realizable value method bridges this gap: it acknowledges both the inherent separability of post-split-off costs and the truth that the joint process’s value lies ultimately in the products’ selling prices.

From an economic standpoint, a product’s contribution to covering joint costs should reflect what it will actually fetch in the market. That is precisely what NRV captures.

Separable costs are excluded

A critical detail: only costs incurred after split-off are deducted. If the refinery spends $2 million on crude inputs, distillation, and separation—that is joint cost, allocated by the NRV method. But the $500,000 spent on diesel hydrotreating is a separable cost; it is deducted from diesel’s gross revenue before the allocation begins. This ensures that the joint cost calculation does not punish products that happen to require additional work.

The formula for each product’s cost is:

Product Cost = [Joint Costs] × [Product NRV ÷ Total NRV]

Where NRV = Expected Selling Price − Separable Costs.

A worked example

Three products emerge from a joint process costing $100,000:

• Product A: sells for $200,000; separable costs $30,000; NRV = $170,000
• Product B: sells for $150,000; separable costs $25,000; NRV = $125,000
• Product C: sells for $80,000; separable costs $10,000; NRV = $70,000

Total NRV = $365,000.

Product A’s share of joint cost = $100,000 × ($170,000 ÷ $365,000) = $46,575. Product B’s share = $100,000 × ($125,000 ÷ $365,000) = $34,247. Product C’s share = $100,000 × ($70,000 ÷ $365,000) = $19,178.

Product A’s total cost = $46,575 + $30,000 = $76,575; gross profit = $200,000 − $76,575 = $123,425. Product B’s total cost = $34,247 + $25,000 = $59,247; gross profit = $150,000 − $59,247 = $90,753. Product C’s total cost = $19,178 + $10,000 = $29,178; gross profit = $80,000 − $29,178 = $50,822.

Each product’s gross-profit-margin reflects its proportional value added by the joint process—a result that aligns economic reality with accounting treatment.

When NRV is indispensable

The method is essential when products require vastly different post-split-off work. In meat packing, hide, organs, and prime cuts all come from the same animal. Hide is tanned; organs are inspected and treated; prime cuts are aged and trimmed. NRV allocates the carcass cost fairly, recognizing that the tanning plant’s $50,000 annual spend is not the joint process’s responsibility—it belongs to hide alone.

Similarly, in fruit processing, juice sells at one price; pulp for animal feed, another; pectin extracted from solids, a third. The NRV method ensures that the initial pressing cost is split proportionally to the ultimate revenue, not to tonnes of material.

Accounting implementation

Under Generally Accepted Accounting Principles, NRV-allocated inventory is recorded at its assigned cost plus separable costs. When sold, the product’s cost flows through cost-of-goods-sold on the income-statement. If a product is not fully sold at year-end, the unsold portion remains on the balance-sheet as inventory at its allocated cost.

The method must be applied consistently year-to-year; switching to physical-quantity or relative-sales-value methods is a change in accounting estimate requiring disclosure and, often, prior-period restatement.

Challenges in practice

Uncertain future prices: If a product’s selling price is volatile or not yet determined, NRV becomes speculative. Some firms use market prices at split-off as a proxy; others use a rolling average or budget estimate, opening the door to manipulation.

Byproducts and scrap: If a joint process yields small quantities of valuable byproducts, their NRV can be subtracted from total joint cost (the byproduct method) rather than allocated a share. The distinction is one of materiality and intent.

Idle capacity and fixed overhead: Joint costs often include fixed overhead (plant depreciation, supervision). If production volumes vary, the NRV method can produce misleading allocations in low-volume periods, when a fixed cost divided by small output inflates unit costs.

See also