The Cost Reduction Case Interview Framework
Master the cost cutting case interview with a framework that identifies the right levers, prioritizes by impact, and protects strategic capabilities.
Cost reduction cases are tests of surgical thinking. The question is never "how do we spend less?" Any executive can cut costs by eliminating things. The question is "which costs can we remove without destroying the capabilities that make us competitive?" That distinction separates cost-cutting that creates value from cost-cutting that defers failure.
This guide walks you through the cost reduction framework, shows you how to identify the right levers and sequence them correctly, and explains how to protect strategic capabilities while driving meaningful savings. After reading this, you will know how to approach any cost case with the analytical rigor that consulting firms respect. For broader context on the profitability landscape this analysis sits within, see the profitability case interview framework, which covers both the revenue and cost sides of the P&L.
"Every company has costs it doesn't need. The dangerous ones are the costs it thinks it doesn't need but actually does."
Why Cost Reduction Cases Require Strategic Judgment
Cost cases feel like math problems but they are fundamentally strategic problems. They ask you to understand the business well enough to know which costs are load-bearing.
Think of a cost structure like the frame of a building. Some walls are decorative. Remove them and the building looks different but stands fine. Other walls are structural. Remove them and the building collapses, often slowly enough that you don't realize the problem until the damage is irreversible. A cost reduction program that eliminates structural costs, quality control, R&D, supplier relationships, sometimes produces a great P&L for 18 months and a crisis for the 18 months after that.
The Boeing 737 MAX story is a case study in exactly this failure mode. Cost reduction that reached too deep into engineering rigor and safety infrastructure created consequences that dwarfed the savings.
The Cost Reduction Framework: Three Tiers of Cuts
Organize your cost reduction analysis into three tiers, ranked by risk and reversibility.
Tier 1: Efficiency improvements. These are costs that can be reduced through better process, technology, or procurement without changing what the company does or who does it. Renegotiating supplier contracts, automating repetitive back-office tasks, eliminating redundant systems after a merger. These cuts are low-risk, often reversible, and should always be identified first. Separating fixed from variable costs before this analysis is essential — the levers available for each category differ substantially.
Tier 2: Scope reductions. These cuts reduce the range of what the company does: exiting unprofitable product lines, closing underperforming locations, reducing service tiers. Higher impact than efficiency improvements, but they change the company's footprint and may take longer to recover from if the decision turns out to be wrong. When evaluating which product lines to exit, contribution margin analysis by line is the right lens — a product with positive contribution margin should almost never be eliminated, even if it shows a net loss after fixed cost allocation.
Tier 3: Capability reductions. These cuts reduce the depth of what the company can do: downsizing R&D, reducing quality control headcount, narrowing supplier diversity. These produce the largest near-term savings and the highest long-term risk. Capability reductions should be the last lever you pull, the most explicitly flagged, and the most carefully bounded.
How to Open a Cost Reduction Case on Interview Day
Start by understanding the urgency and the constraints.
"Before I structure our cost analysis, two questions: is this a crisis-driven cost reduction with a hard timeline, or a strategic optimization with more runway? And are there specific areas management has already flagged as off-limits?" The first question tells you how deep you need to go on each tier. A crisis requires immediate, high-impact cuts regardless of reversibility. A strategic optimization allows a more measured approach that protects capability. The second question tells you whether there are political constraints that will shape what's actually implementable. Grounding your opening in a solid case structure before diving into tiers keeps the analysis coherent under time pressure.
Then structure clearly: "I'll identify cost reduction opportunities across three tiers: efficiency improvements, scope reductions, and capability reductions. I'll quantify the savings potential in each tier, assess the risk and reversibility of each, and recommend the right sequencing given the client's situation."
Practice this framework on a real case: the Boeing 737 MAX 2019 case on BoardroomIQ puts you at the center of a cost reduction program that compromised safety infrastructure, and forces you to think through exactly where the line between strategic cost efficiency and capability destruction actually lies.
Practice this framework
Work through the Boeing 737 MAX 2019: Safety as a Competitive Casualty case with AI coaching.
Prioritizing Cuts: The Two-by-Two That Actually Works
When you have a list of potential cost reduction levers, you need a way to prioritize. The two dimensions that matter most are savings magnitude and implementation risk.
High savings, low risk: always recommend these. They are the easy wins that build momentum and buy credibility for the harder decisions.
High savings, high risk: these require careful analysis. The questions to ask are whether the risk is manageable through mitigation, whether the savings justify the risk if mitigation fails, and whether there is a reversible version of the same cut that captures most of the value.
Low savings, low risk: these are the efficiency improvements that are worth doing but shouldn't dominate the conversation. Aggregate them and give them a line item, but don't spend 20 minutes of case time on initiatives that collectively save 2% of the cost base.
Low savings, high risk: never recommend these. A cut that is both small in value and high in risk is a symptom of desperation, not strategy.
How to Practice Cost Reduction Cases Before Your Interviews
Exercise 1: Cost structure mapping. For any company you know well, map its major cost categories as a percentage of revenue. Start by separating fixed from variable costs — this split tells you immediately which costs scale with volume and which are structural commitments. Then identify one lever in each of the three tiers: an efficiency improvement, a scope reduction, and a capability reduction. Estimate the savings magnitude for each and the risk of each.
Exercise 2: Reversibility testing. For any cost cut you identify in a practice case, ask: "If this cut turns out to be wrong, how long does it take to reverse it and what does reversal cost?" Cuts that are cheap to reverse deserve lower risk weighting. Cuts that are expensive or slow to reverse should be treated with much higher scrutiny.
Exercise 3: Stakeholder mapping. Cost reductions rarely fail because the math is wrong. They fail because the people affected resist or subvert implementation. In any cost case, identify the two or three stakeholder groups most affected and articulate how you would manage their resistance. Implementation awareness separates a good analytical answer from a genuinely useful one.
The best way to practice cost reduction cases is under realistic pressure, with a case that fights back.