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Comparison · Break-Even

Rework vs. Scrap: Expected Recovery

Compare uncertain rework recovery with immediate scrap proceeds, including failed rework, selling costs, and the probability needed to justify the effort.

By PriceAndProfit Editorial Updated

A rework decision begins after defective output already exists. The original manufacturing expenditure remains part of the historical batch result, but it does not change between scrapping now and attempting repair. Compare the future receipts and costs of those available choices. Rework can be worthwhile even when the complete batch remains unprofitable, and it can be wasteful even when the repaired item would sell above its original unit cost.

Worked decision model

Rework net proceeds = successful units × net sale proceeds + failed units × salvage after failure − rework cost; compare with immediate scrap proceeds

Assume 100 defective units could be sold as scrap for $3 each, producing $300 immediately. Reworking all units costs $800. Each successfully recovered unit could sell for $20 and would require $2 of selling and delivery costs. A failed rework attempt leaves scrap worth $1 per unit. The success rate is a scenario input; no claim is made that any particular process achieves it.

At a 70% success rate, 70 units are recovered and 30 still fail. Expected sales net of selling costs are 70 × $18 = $1,260, and failed-unit salvage is $30. After the $800 rework cost, future net proceeds are $490. That exceeds the $300 immediate-scrap option by $190. The original manufacturing cost should not be deducted again from only the rework option when comparing these two choices.

Hypothetical example; all percentage bases are stated
DispositionRecovered unitsFailed unitsFuture net proceedsDifference from scrap now
Scrap immediately 0 100 $300 $0
Rework at 70% success 70 30 $490 $190
Rework at 50% success 50 50 $150 −$150
70% rework plus $250 displaced contribution 70 30 $240 −$60

At a 50% success rate, net proceeds are 50 × $18 plus 50 × $1 minus $800, or $150. Rework is then $150 worse than scrapping immediately. Writing the success fraction as p, rework proceeds equal $1,700p − $700. Equating that with the $300 immediate recovery gives a success threshold of 10/17, or approximately 58.8235%. Above that rate the expected-value model favors rework; below it the model favors immediate scrap.

The expected count is not a promise about one small batch. Actual outcomes can vary, and successful recovery must include the full required inspection, not merely completion of the repair operation. If recovered units sell for a different price or carry additional support risk, revise their net proceeds. Salvage after a failed attempt can also be lower than immediate scrap because rework changes the material's condition. That difference is already included here through the $3 versus $1 recovery amounts.

Check scarce labor and machine time. If rework displaces a job contributing $250, the 70% scenario's $190 advantage becomes a $60 disadvantage after that opportunity cost. If spare capacity exists, do not invent a displaced job just to assign a cost to idle time. Preserve the immediate-scrap case, the success scenarios, and the full historical batch loss separately. The decision identifies the better remaining recovery option under stated assumptions; it does not erase the quality problem that created the defective units.

Scrap immediately

  • Future receipts: Known or quoted recovery for the current defective condition.
  • Cost question: Any disposal, transport, or handling charge required to obtain that recovery.

Attempt rework

  • Future receipts: Probability-weighted recovered sales plus the salvage left after unsuccessful attempts.
  • Cost question: Rework, inspection, selling costs, and contribution displaced from scarce capacity.
Bottom line

Compare expected future recoveries with immediate scrap proceeds, then test success rates and any contribution displaced by rework.

Apply and verify the decision

  1. Define a successful recovery

    Require the product to meet the specification needed for sale and include final inspection and downstream service costs.

  2. Use evidence for probabilities

    Distinguish measured recovery experience from a hypothetical rate and test a lower-success case with the same cost boundary.

  3. Keep historical and future views

    Report original batch losses for accountability while comparing disposition choices using only future differences and supported opportunity costs.

Method reference: OpenStax: Selling or Processing Further. Accessed October 22, 2026. The reference supports the accounting concept; all scenario prices, rates, probabilities, and worked calculations are independently constructed hypothetical examples.

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