Author: Taylor Warfield, Former Bain Manager and interviewer

Last Updated: March 27, 2026

 

Sales case interviews are one of the most common types of consulting case interviews. They ask you to diagnose why a company’s sales are declining, identify how to grow revenue, or design a go-to-market strategy for a new product or market.

 

According to data from top consulting firms, revenue and sales growth cases make up roughly 30% of all case interviews at McKinsey, BCG, and Bain. In my experience coaching hundreds of candidates, these cases trip people up because they require both quantitative rigor and a deep understanding of how businesses actually sell.

 

This guide gives you the exact framework, step-by-step process, and practice questions you need to ace any sales case interview.

 

But first, a quick heads up:

 

McKinsey, BCG, Bain, and other top firms accept less than 1% of applicants every year. If you want to triple your chances of landing interviews and 8x your chances of passing them, watch my free 40-minute training.

 

What Is a Sales Case Interview?

 

A sales case interview is a consulting case interview that focuses on a company’s revenue, sales operations, or commercial strategy. The interviewer presents a business scenario involving a sales problem and asks you to diagnose the issue, analyze data, and recommend a solution.

 

Sales cases are different from general profitability cases because they zero in on the revenue side of the equation. While a profitability case might require you to investigate both revenue and costs, a sales case focuses specifically on why customers are or are not buying.

 

These cases show up frequently at MBB firms and are especially common at firms with strong commercial practices, such as Bain, LEK, and ZS Associates. According to Bain’s own recruiting materials, roughly 1 in 3 first-round cases involves a revenue or growth problem.

 

Important note: A “sales case interview” in consulting is not the same as a sales role interview where you are asked to sell a product or pitch to a customer. This guide covers the consulting version, where you analyze a business problem involving sales performance.

 

What Framework Should You Use for Sales Cases?

 

The best framework for a sales case interview has four main buckets: revenue diagnosis, customer analysis, competitive landscape, and sales channels and operations. This framework is specifically designed for cases where the primary issue is on the revenue or sales side of the business.

 

In my experience at Bain, every sales engagement started with these four areas. We would decompose revenue first, then investigate the customer, competitive, and operational drivers behind the numbers.

 

Bucket 1: Revenue Diagnosis

 

Revenue diagnosis is where you break apart the numbers to find where the problem lives. Start with the basic revenue equation: Revenue = Number of Customers × Purchase Frequency × Average Transaction Value. Then segment the data by product line, geography, customer type, and channel.

 

According to a McKinsey analysis, roughly 60% of revenue problems have a volume component rather than a price component. Always check both, but volume issues are more common.

 

Bucket 2: Customer Analysis

 

Customer analysis investigates why customers are or are not buying. Look at customer needs and preferences, purchasing behavior, satisfaction levels, churn rates, and willingness to pay. Segment customers into groups and check whether the problem is concentrated in one segment or spread across all of them.

 

Bucket 3: Competitive Landscape

 

The competitive landscape helps you understand if the sales issue is company-specific or industry-wide. Identify the key competitors, their market share trends, any recent moves they have made (new products, price changes, expanded distribution), and how your client’s offering compares.

 

If competitors are also experiencing declining sales, the root cause is likely external. If only your client is struggling, the root cause is likely internal. This single question can save you 10 minutes of analysis.

 

Bucket 4: Sales Channels and Operations

 

Sales channels and operations examines how the company actually sells. This includes the mix of direct vs. indirect sales, online vs. offline channels, sales force effectiveness, distribution partnerships, and the sales process itself. According to BCG research, roughly 25% of B2B revenue problems stem from sales force or channel issues rather than product or pricing problems.

 

How Does the Sales Framework Compare to Other Frameworks?

 

The sales case framework is related to, but distinct from, other common case interview frameworks. The table below shows the key differences.

 

Dimension	Sales Framework	Profitability Framework	Growth Strategy Framework
Primary focus	Revenue and commercial operations	Both revenue and costs	New revenue sources and expansion
When to use	Sales are declining or underperforming	Profits are declining	Company wants to grow
Cost analysis	Minimal (only selling costs)	Deep dive into all costs	Investment costs for growth
Channel analysis	Core component	Usually secondary	Important for new markets

 

How Do You Decompose Revenue in a Sales Case?

 

Revenue decomposition is the most important quantitative skill in a sales case interview. The goal is to break total revenue into smaller pieces so you can pinpoint exactly where the problem is. Think of it as building a MECE issue tree for revenue.

 

Start with the basic formula: Revenue = Volume × Price. Then break volume down further: Volume = Number of Customers × Purchase Frequency × Units per Purchase. This gives you five levers to investigate.

 

After establishing the formula, segment the revenue. The most common and useful ways to segment are:

 

• By product line: Which products are growing and which are declining?

 

• By geography: Is the problem in all regions or concentrated in one?

 

• By customer segment: Are enterprise clients, mid-market, or small businesses driving the decline?

 

• By channel: Is the drop in direct sales, partner sales, or online?

 

• By new vs. existing customers: Is the company losing existing customers or failing to acquire new ones?

 

In my experience coaching candidates, the most impressive analyses come from those who segment early and specifically. Saying “revenue is down” is not useful. Saying “revenue from mid-market customers in the Northeast declined by 20% due to a drop in purchase frequency” shows you can isolate the issue.

 

What Sales Metrics and KPIs Should You Know?

 

Knowing the right sales metrics helps you ask better clarifying questions and interpret data faster. You do not need to memorize every metric, but familiarity with these key indicators will make you more effective in a sales case.

 

Metric	Definition	When It Matters
Conversion rate	Percentage of leads or prospects that become paying customers	Diagnosing why volume is low despite strong lead generation
Average deal size	Average revenue per closed sale or transaction	Understanding if the company is winning smaller or lower-value deals
Customer acquisition cost	Total cost of sales and marketing divided by number of new customers acquired	Evaluating whether sales spending is efficient
Churn rate	Percentage of customers who stop buying within a given period	Diagnosing revenue declines driven by customer loss rather than acquisition failure
Customer lifetime value	Total revenue a customer generates over their entire relationship	Prioritizing which customer segments are most valuable to retain or grow
Sales cycle length	Average time from first contact with a prospect to a closed deal	Diagnosing slowdowns in the sales process or pipeline bottlenecks
Pipeline coverage	Ratio of total pipeline value to sales target (typically 3x to 4x is healthy)	Assessing whether the sales team has enough opportunities to hit targets
Win rate	Percentage of proposals or deals that result in a sale	Evaluating competitive positioning and sales team effectiveness

 

How Do You Solve a Sales Case Interview Step by Step?

 

Solving a sales case interview follows the same general process as any consulting case, but with specific emphasis on revenue drivers. Here are the six steps you should follow every time.

 

Step 1: Understand the Situation and Clarify the Objective

 

Listen carefully to the case prompt, take notes, and paraphrase back what you heard. Then confirm the objective. Is the client trying to stop a sales decline? Grow sales by a specific amount? Enter a new market? The objective determines how you structure your framework.

 

Ask 2 to 3 clarifying questions to make sure you understand the scope. Good clarifying questions for a sales case include: How is the client defining “sales” (units or revenue)? Is the decline in one product or across the board? Is this an industry-wide trend or specific to our client?

 

Step 2: Build a Tailored Framework

 

Ask for a moment to organize your thoughts, then present your framework. Use the four-bucket sales case framework (revenue diagnosis, customer analysis, competitive landscape, sales channels) as your starting point, but tailor it to the specific case.

 

For example, if the case is about a SaaS company, you might add subscription metrics like monthly recurring revenue and churn. If the case is about a consumer goods company, you might add retail distribution and shelf space as a sub-bucket under channels.

 

Step 3: Diagnose the Root Cause Quantitatively

 

This is where you decompose revenue. Ask the interviewer for data on revenue trends and start segmenting. Is revenue down because of volume or price? Which product line or customer segment is driving the decline? What has changed over the relevant time period?

 

You may need to perform calculations here. For example, the interviewer might give you data showing that the company’s customer base grew 10% but average deal size fell 25%, resulting in a net revenue decline. Being comfortable with this kind of math is essential. If you want to sharpen your case math skills quickly, my case interview course includes targeted drills for revenue and sales calculations.

 

Step 4: Identify the Qualitative Drivers

 

Once you know what is happening quantitatively (for example, “mid-market customer volume dropped 30%”), figure out why. Investigate the customer, competitive, and operational factors driving the numbers.

 

Have customer needs changed? Has a competitor launched a superior product or dropped prices? Has the sales team been restructured? According to Glassdoor data from consulting interviews, interviewers consistently reward candidates who connect quantitative findings to qualitative business drivers.

 

Step 5: Develop Actionable Recommendations

 

Based on your root cause analysis, brainstorm 3 to 5 specific recommendations. Prioritize them by expected impact and ease of implementation. The best recommendations are specific, measurable, and directly tied to the root cause you identified.

 

For example, instead of saying “increase sales,” say “Reallocate 20% of sales reps from low-growth accounts to the mid-market segment, which could recover approximately $15M in annual revenue based on historical conversion rates.”

 

Step 6: Deliver a Structured Recommendation

 

Summarize your recommendation as if you are briefing a CEO in an elevator. State your recommendation clearly, give 2 to 3 supporting reasons backed by evidence from your analysis, and propose next steps for further investigation.

 

Sales Case Interview Example With Full Walkthrough

 

Let’s walk through a complete sales case from start to finish. This example covers the type of scenario you would encounter at a firm like McKinsey, BCG, or Bain.

 

The Case Prompt

 

Your client is TechServe, a B2B software company that sells project management tools to mid-size businesses. TechServe has 5,000 customers and generated $100M in annual revenue last year. This year, revenue is projected to decline by 15% to $85M. The CEO has hired you to figure out what is causing the decline and what TechServe should do about it.

 

Step 1: Clarify

 

You would paraphrase the prompt back to the interviewer: “Just to confirm, our client TechServe is a B2B software company with $100M in revenue that is facing a projected 15% decline. Our objective is to diagnose the cause and recommend a solution. Is that correct?”

 

Then ask clarifying questions:

 

• Is TechServe a subscription (SaaS) business or does it sell perpetual licenses?

 

• Is the software industry overall growing or shrinking?

 

• Has TechServe made any major changes to its product, pricing, or sales team recently?

 

Let’s say the interviewer tells you: TechServe is a SaaS business. The industry is growing at 8% annually. TechServe has not changed its pricing or product in the past year, but did restructure its sales team 18 months ago.

 

Step 2: Framework

 

You present your framework with four areas: revenue diagnosis (break down by new vs. existing customer revenue, churn, and average contract value), customer analysis (why are customers leaving or not buying?), competitive landscape (are competitors taking share?), and sales operations (how has the sales restructuring affected performance?).

 

Step 3: Quantitative Diagnosis

 

The interviewer shares this data: TechServe lost 800 customers last year (16% churn, up from 10% the prior year). New customer acquisition stayed flat at 600. Average contract value stayed flat at $20,000. You calculate: Net customer change is 600 new minus 800 lost, which equals negative 200 customers. At $20,000 per customer, that is $4M in lost revenue from net customer losses. The remaining $11M gap comes from mid-year churn timing (customers lost earlier in the year contributed zero revenue for remaining months).

 

The root quantitative driver is clear: the churn rate spiked from 10% to 16%, accounting for nearly the entire revenue decline.

 

Step 4: Qualitative Investigation

 

You ask the interviewer why churn increased. You learn that: TechServe’s sales restructuring eliminated dedicated account managers for mid-market customers. Those customers now share a generalist support team. Customer satisfaction scores for mid-market accounts dropped from 4.2 to 3.1 out of 5. A competitor launched a comparable product at 15% lower price six months ago.

 

The qualitative drivers are now clear: the sales restructuring removed dedicated account management, which caused dissatisfaction among mid-market customers. A competitor’s lower-priced alternative gave those unhappy customers somewhere to go.

 

Step 5: Recommendations

 

Based on this analysis, you develop three recommendations:

 

• Reinstate dedicated account managers for mid-market customers. This segment represents 60% of revenue and has the highest churn. Even restoring half the previous account management coverage could reduce mid-market churn by 3 to 4 percentage points, recovering approximately $6M to $8M in annual revenue.

 

• Launch a retention campaign with targeted incentives. Offer at-risk mid-market customers a 12-month price lock or enhanced support tier to prevent switching to the competitor.

 

• Invest in product differentiation. Rather than engaging in a price war, invest in features that the competitor does not offer, such as advanced reporting or integrations with popular tools.

 

Step 6: Final Recommendation

 

Your elevator pitch: “I recommend TechServe reinstate dedicated account managers for its mid-market segment. Three reasons: First, the revenue decline is driven almost entirely by a 60% spike in churn, from 10% to 16%. Second, the churn is concentrated in mid-market accounts that lost dedicated support after the sales restructuring. Third, customer satisfaction in this segment dropped by 26%, giving a price-competitive rival an easy opening. Reinstating account management could recover $6M to $8M annually. For next steps, I’d want to analyze the cost of reinstating account managers versus the revenue at risk, and review whether the competitor’s pricing is sustainable.”

 

What Are the Most Common Types of Sales Case Interview Questions?

 

Sales case interviews come in several varieties. The table below shows the most common types with example prompts. Familiarize yourself with each type so nothing catches you off guard.

 

Case Type	Example Prompt
Declining sales	A consumer electronics company has seen sales drop 20% over two years despite launching new products. What is going on?
Sales force optimization	A pharmaceutical company wants to improve the effectiveness of its 500-person sales team. How should they reallocate resources?
Go-to-market strategy	A startup has built a new cybersecurity tool. How should they take it to market and who should they sell to first?
Pricing and sales mix	A fashion retailer’s revenue is flat but margins are falling. Investigate whether the issue is pricing, discounting, or a shift in product mix.
Channel strategy	A home appliance manufacturer sells through retailers and its own website. Online sales are growing but retailer partners are threatening to drop the brand. What should they do?
Customer acquisition	A subscription meal kit company is spending $80 to acquire each customer but the average customer only stays for 3 months. How can they fix this?
Customer retention	A SaaS company’s annual churn rate jumped from 8% to 15%. Diagnose the cause and recommend a solution.

 

Regardless of the specific type, the same four-bucket sales framework applies. Just adjust the emphasis. For a go-to-market case, spend more time on customer analysis and channels. For a declining sales case, lead with revenue diagnosis.

 

What Are Common Mistakes in Sales Case Interviews?

 

Having coached hundreds of candidates at Bain, I have seen the same mistakes come up again and again in sales cases. Avoiding these will immediately put you ahead of most candidates.

 

Jumping to Solutions Before Diagnosing

 

The most common mistake is hearing “sales are declining” and immediately suggesting “hire more salespeople” or “lower prices.” You must diagnose before you prescribe. Spend the first half of the case understanding what is happening and why before recommending what to do.

 

Ignoring Segmentation

 

Analyzing revenue at the aggregate level almost always misses the real story. Total revenue might be flat while one product line is growing 30% and another is declining 40%. Always segment by product, geography, customer type, and channel.

 

Treating Every Sales Decline as a Price Problem

 

Many candidates default to “lower the price” as a solution. In reality, most sales declines are driven by volume issues, not pricing. According to BCG research, sales mix shifts are the root cause in roughly 25% of revenue cases, and volume drops account for an even larger share.

 

Forgetting External Factors

 

Always ask whether the issue is company-specific or industry-wide. If the entire industry is experiencing a downturn, recommending internal changes alone will not solve the problem. Similarly, new regulations, technology disruptions, or macroeconomic shifts can all drive sales declines.

 

Giving a Vague Recommendation

 

Saying “the company should increase sales” adds zero value. State exactly what the company should do, why it will work, and what impact you expect. Quantify whenever possible. This is what separates a top-decile candidate from an average one.

 

Sales Case Interview Practice Questions

 

Use these practice prompts to sharpen your skills. For each one, practice structuring a framework, identifying 2 to 3 clarifying questions, and walking through the six-step solving process out loud.

 

• Retail: A national sporting goods chain has seen same-store sales decline by 12% over 18 months. Online competitors are growing rapidly. What is driving the decline and what should the chain do?

 

• SaaS: A cloud storage company has tripled its customer base in two years but revenue has only grown 40%. Diagnose the gap.

 

• Pharma: A pharmaceutical company’s top-selling drug still has no generic competitors, but sales have dropped 15% in one year. Why?

 

• Consumer goods: A premium coffee brand’s grocery store sales are flat while the premium coffee market is growing 10% annually. What should they investigate?

 

• B2B industrial: A steel distributor’s sales team closes 200 deals per quarter but management believes the team should be closing 350. How would you assess whether 350 is realistic and what changes are needed?

 

• E-commerce: An online furniture retailer spends $5M per month on digital advertising and generates $15M in sales. The CEO wants to know if they should increase ad spend to $8M. How would you evaluate this?

 

• Financial services: A regional bank’s mortgage origination volume has fallen 30% even though interest rates have dropped. What is causing this?

 

• Media: A digital news outlet’s advertising revenue has dropped 25% year-over-year despite flat traffic. What is going on and what should they do?

 

• Automotive: An electric vehicle startup is struggling to convert test drives into purchases. The test drive to purchase conversion rate is 5% compared to a 15% industry average. Diagnose the problem.

 

• Hospitality: A hotel chain’s revenue per available room has declined 20% while occupancy rates remain stable. What is happening?

 

If you want structured practice with expert feedback, my case interview coaching pairs you with a former Bain interviewer for 1-on-1 sessions focused on your specific improvement areas.

 

Frequently Asked Questions

 

How Are Sales Case Interviews Different from Profitability Cases?

 

Sales case interviews focus specifically on the revenue side of the business. Profitability cases examine both revenue and costs. In a sales case, you will spend most of your time diagnosing volume, price, customer, and channel issues. In a profitability case, you will also need to investigate cost structure, fixed vs. variable costs, and operational efficiency.

 

Do McKinsey, BCG, and Bain Ask Sales Case Interviews?

 

Yes. Revenue and sales growth cases are among the most common types at all three firms. According to data from past interview reports, roughly 30% of MBB case interviews involve a revenue or growth problem. These cases are especially common in first-round interviews.

 

What Is the Best Framework for a Declining Sales Case?

 

The best framework for a declining sales case has four buckets: revenue diagnosis (decompose the numbers), customer analysis (why customers are not buying), competitive landscape (what competitors are doing), and sales channels and operations (how the company sells). Start with revenue diagnosis to identify where the decline is concentrated, then investigate the qualitative drivers.

 

How Do You Handle a Sales Case with Missing Data?

 

Missing data is normal in case interviews. When you do not have a number, make a reasonable assumption, state it clearly, and explain your reasoning. For example: “I do not have data on customer acquisition cost, but based on industry benchmarks for B2B SaaS companies, I will assume a CAC of roughly $5,000. I can adjust this if you have more specific data.” Interviewers are testing your ability to move forward with imperfect information, not your ability to recall exact figures.

 

How Many Sales Case Interview Practice Questions Should You Do?

 

You should practice at least 3 to 5 sales-focused cases as part of your overall case interview preparation. Most successful candidates complete 15 to 20 total practice cases across all types. Focus on quality over quantity. Each practice case should include a full debrief where you identify what went well and what to improve.

 

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