CA
Tax Tutor
A

Material Losses (Waste, Scrap, Spoilage, Defectives)

Think about Rajesh & Co. Pvt. Ltd. running a textile unit. They buy 1,000 kg of raw cotton, but by the time it's processed, they only get 940 kg of fabric. Where did the other 60 kg go? That "gone" material is what we call material loss — and how you classify and account for it can swing your cost sheet significantly. This is asked frequently as a 4-6 mark question in the Cost Sheet or Process Costing area.

Material losses fall into two broad buckets: Normal Loss and Abnormal Loss. Normal loss is the expected, unavoidable loss that every business in that industry accepts — cotton shrinks when processed, chemicals evaporate, metals oxidise. Because it's expected, its cost is silently absorbed into the good output. You simply raise the cost per unit of output to recover the full input cost. If the lost material has some sale value (e.g., cotton dust sold to a paper mill), that scrap recovery reduces the net cost before you calculate cost per unit. Abnormal loss, on the other hand, is the loss beyond what's normal — caused by carelessness, machine breakdown, bad material, or a power cut. Because it's avoidable, it is NOT loaded onto good output. Instead, it's valued at the same rate as good output and written off to the Costing Profit & Loss Account — it's an inefficiency, not a production cost.

Within losses, also know the sub-types: Waste is material lost with zero recovery value (vapour, dust gone in the air). Scrap has a small but identifiable resale value (metal turnings, cotton waste). Spoilage refers to output so damaged it can't be processed further and must be disposed of; if it's normal spoilage, its net cost is borne by good units. Defectives are sub-standard units that can be reworked — rework cost treatment depends on whether the defect was normal or abnormal. For the exam, always identify: Is it normal or abnormal? Does the lost material have scrap value? These two questions drive the entire accounting treatment.

📊 Worked example

Example 1 — Normal Loss with Scrap + Abnormal Loss

Rajesh & Co. introduces 2,000 kg of raw material into a process at ₹40/kg. Processing charges are ₹79,200 total (already included in total cost below for simplicity — see working). Normal loss is 10% of input. Scrap from normal loss fetches ₹4/kg. Actual output is 1,750 kg. Calculate abnormal loss and its value.

Step 1 — Total Input Cost

| Item | Amount |

|---|---|

| Raw material (2,000 kg × ₹40) | ₹80,000 |

| Less: Scrap from normal loss (200 kg × ₹4) | (₹800) |

| Net Cost to be recovered | ₹79,200 |

Step 2 — Expected Output

Normal loss = 10% × 2,000 = 200 kg → Expected good output = 1,800 kg

Step 3 — Cost per kg of good output

₹79,200 ÷ 1,800 kg = ₹44/kg

Step 4 — Abnormal Loss

Actual output = 1,750 kg

Abnormal loss = Expected (1,800) – Actual (1,750) = 50 kg

Value of abnormal loss = 50 kg × ₹44 = ₹2,200 → Written off to Costing P&L

(Note: The 50 kg of abnormal loss scrap — 50 × ₹4 = ₹200 — is credited to the Abnormal Loss Account, so net charge to Costing P&L = ₹2,200 – ₹200 = ₹2,000)

---

Example 2 — Quick Cost Sheet Impact

Ms. Iyer's factory has input 500 kg @ ₹100/kg. Normal loss = 5% (no scrap value). Find cost per unit of output.

Net cost = 500 × ₹100 = ₹50,000 (no scrap deduction)

Expected output = 500 – 25 = 475 kg

Cost per kg = ₹50,000 ÷ 475 = ₹105.26/kg

Normal loss has zero separate accounting entry — it simply inflates cost per unit of good output.

⚠️ Common exam mistakes

  • Confusing Normal Loss with Abnormal Loss in the cost sheet. Students load abnormal loss cost onto good output. Correct: Abnormal loss is valued at cost-per-unit rate and taken OUT to Costing P&L — it never reaches the good output cost.
  • Forgetting to deduct scrap value of normal loss before computing cost per unit. Always reduce net cost first (Input Cost – Normal Scrap Realisation), then divide by expected output. Skipping this step inflates cost per unit.
  • Treating abnormal loss scrap the wrong way. The scrap proceeds from abnormal loss units are credited to the Abnormal Loss Account (reducing the net write-off), not to the process account. Don't credit it to the process account.
  • Mixing up Waste, Scrap, Spoilage, and Defectives. In MCQs, read carefully: scrap = has value, waste = no value, spoilage = unsalvageable output, defectives = reworkable output. Each has a different accounting treatment.
  • In Process Costing questions, applying normal loss % to actual output instead of input. Normal loss is always calculated on input introduced, not on output produced.
📖 Reference: Material Losses — Institute of Chartered Accountants of India
Test yourself
Practice questions on this section, AI-graded with citations.
⚡ Practice now →