SaaS & Monetization · SaaS Economics · Hard · 35-45 min

Why Isn't This SaaS Business Profitable?

Why Isn't This SaaS Business Profitable? is a hard SaaS & Monetization saas economics case interview that runs 35-45 min. A B2B SaaS company has grown ARR to $80M but still burns cash and the board is losing patience. A strong answer works through 5 phases: Diagnose the unit economics; Probe the 68% gross margin; Probe NRR at 95%; Probe the 60% S&M and 22-month payback; Sequence the path to profitability.

Last updated 2026-09-05

The brief

A B2B SaaS company has grown ARR to $80M but still burns cash and the board is losing patience. Gross margin is 68% (low for SaaS), net revenue retention is 95%, CAC payback is 22 months, and sales & marketing eats 60% of revenue. You're asked to diagnose why it isn't profitable and lay out the path to durable profitability.

How to approach it

  1. Diagnose the unit economics — LTV/CAC, CAC payback, gross margin, NRR — and where they break vs benchmark
  2. Probe the 68% gross margin — hosting, support, professional services dragging it down
  3. Probe NRR at 95% — churn and lack of expansion; healthy SaaS is >110%
  4. Probe the 60% S&M and 22-month payback — efficiency, motion, ICP focus
  5. Sequence the path to profitability — fix retention/expansion, improve margin, then scale efficiently

What a strong answer does

  • Knows the SaaS benchmarks — 75-80% gross margin, NRR >110%, CAC payback <12-18 months — and measures against them
  • Identifies NRR of 95% as a leaky bucket and prioritizes retention/expansion before more acquisition
  • Digs into what's dragging the 68% margin (services-heavy revenue, infra inefficiency)
  • Links the 22-month payback to S&M efficiency and ICP discipline
  • Sequences fixes — plug churn first, since acquiring into a leaky bucket destroys value

Red flags interviewers score down

  • Recommends spending more on sales to grow out of the problem despite weak retention
  • Ignores NRR / churn and focuses only on new-logo growth
  • Doesn't benchmark the metrics, so can't say what's actually broken
  • No sequencing — tries to fix everything at once with no priority

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