The Margin That Vanished Between Two Reports
A mid-market manufacturer reports Q3 gross margin of 31.4% to its board, down from 34.1% in Q2, and the CFO is asked to explain a 2.7-point deterioration. Revenue was flat at $48.2M both quarters. The cost accountant notes three changes: (1) a new volume-based overhead allocation was adopted at the start of Q3, moving $1.1M of fixed plant overhead from under-absorbed status into COGS; (2) a one-time $0.6M scrap write-off on a discontinued product line landed in COGS in Q3; (3) raw material prices for the core input rose 9% in Q3 but the company holds roughly 60 days of inventory on FIFO. The CFO also observes that Q2 had benefited from a favorable absorption variance because production ran above plan while sales matched plan.
1. Decompose the 2.7-point margin decline into its drivers and state which portion is a genuine economic deterioration versus a reporting/allocation effect.
Read the worked answer
Start from the dollar decline: 2.7% x $48.2M ≈ $1.30M of gross profit.
- Allocation change ($1.1M): This is a reclassification, not new cost. Fixed overhead was always being incurred; the new policy just routes more of it through COGS instead of leaving it as an under-absorption charge elsewhere. Treat as a reporting effect - but flag that if the old policy was hiding true product cost, the new number is the more honest one.
- Scrap write-off ($0.6M): One-time and tied to a discontinued line. Non-recurring; strip it from run-rate margin.
- Raw material (+9%): With ~60 days of FIFO inventory, only roughly one-third to one-half of Q3 COGS reflects the higher price; the rest hits in Q4. So the Q3 margin understates the eventual input-cost drag.
Conclusion: of the ~$1.30M, ~$0.6M is non-recurring, ~$1.1M is allocation timing, and the material inflation is only partially captured. The 'true' recurring margin is closer to flat-to-slightly-down, but the forward risk is larger than the reported number suggests.
2. The board asks for a 'clean' comparable margin. What adjustments would you make, and what caveat must accompany the adjusted figure?
Read the worked answer
Adjusted gross profit ≈ reported $15.13M (31.4% x $48.2M) + $0.6M scrap = $15.73M, or ~32.6% on flat revenue. Do not add back the $1.1M allocation change - that is a policy choice, not a distortion of underlying economics, and reversing it would re-hide real overhead.
Caveat: the adjusted 32.6% still uses FIFO inventory that has not yet absorbed the full 9% material increase. A like-for-like 'current-cost' margin would be lower, perhaps 31.5–32%. Present both: the recurring comparable margin and a forward-looking current-cost margin. Also disclose that the Q2 comparative was flattered by above-plan production (favorable absorption), so Q2 itself was not a clean base.