What is minimum operating cash, and why is identifying it the first analytical step in a liquidity crisis?
A core Restructuring interview question — asked in analyst and associate interviews across IB, PE, and the Big 4.
THE SHORT ANSWER
Minimum operating cash is the floor of cash the business genuinely needs on hand to keep operating day-to-day — to cover intra-month timing swings, payroll runs, critical supplier payments, deposits, and local minimums across the group — below which it can't function even if it's technically solvent on paper. It's the first step because 'cash runway' is meaningless without it: the date you run out isn't when the bank balance hits zero, it's when it hits the minimum operating level, which can be substantial and is often trapped in pockets across subsidiaries/jurisdictions. You build it bottom-up (by entity, accounting for trapped cash and intra-month peaks, not just month-end snapshots), then overlay the 13-week forecast to find the true point of failure and how much bridge financing or self-help is needed. Underestimating minimum cash is a classic, fatal error — companies 'run out' well before zero.
WHAT INTERVIEWERS LISTEN FOR
- ✓Floor of cash needed to operate (timing swings, payroll, critical payments, local minimums)
- ✓Runway ends at the minimum level, not zero
- ✓Build bottom-up by entity; account for trapped cash and intra-month peaks
- ✓Overlay 13-week to find the true failure point and bridge need
COMMON MISTAKES
- ✗Assuming runway ends at a zero balance
- ✗Using month-end snapshots, ignoring intra-month peaks
- ✗Ignoring trapped/segregated cash by entity
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