Maintenance vs Growth CapEx in Interviews
IB and PE interview guide to maintenance vs growth CapEx: how to split them, impact on FCF and valuation, and what to say when the company does not disclose it.
PE · 5 min read
"How much CapEx is maintenance versus growth?" is a diligence classic. Total CapEx alone cannot tell you whether the business throws off cash after staying in place. Interviewers use this to test whether you confuse accounting depreciation with real sustaining spend.
The short answer
"Maintenance CapEx is the spend required to sustain current operations and cash flow. Growth CapEx is discretionary spend to expand capacity, new stores, new products, or new markets. For valuation and FCF quality, I care about cash generation after maintenance CapEx. Growth CapEx should earn returns, not get treated as mandatory forever."
Why the split matters
| View | If you ignore the split |
|---|---|
| FCF quality | Overstate sustainable cash by treating all CapEx as optional |
| Growth story | Understate investment needed to hit the plan |
| Multiples | Miscompare capex-heavy vs light peers |
| LBO debt paydown | Overstate cash available for deleveraging |
Rough quality FCF
FCF after maintenance ? CFO-ish ? Maintenance CapEx (definitions vary; be explicit)
In bank cases and PE screens, "quality of earnings" often pairs with "quality of FCF." A firm that prints EBITDA but needs rising sustaining CapEx just to hold volume is not as cash-rich as the bridge suggests.
How people estimate maintenance when undisclosed
Depreciation proxy
Maintenance ? D&A as a crude start (often wrong, but a bound).
Facility / unit model
$ per store / plant to keep open ? unit count.
Management bridge
Ask for sustaining vs expansion in diligence.
History
CapEx in zero-growth years if you can find them.
Age of PP&E
Old fleets and plants often need catch-up spend mislabeled as growth.
PE diligence questions
- What happens to revenue if CapEx falls 30% for two years?
- How much CapEx per new unit, and what payback?
- Is "growth CapEx" actually catch-up maintenance?
- Capital leases / software capitalize-vs-expense policies
- Deferred maintenance visible in R&M, downtime, or quality KPIs?
- Maintenance CapEx per unit of capacity vs peers
Modeling
In an LBO or DCF:
- Run maintenance CapEx with sales or inflation
- Layer growth CapEx only in cases that include growth outcomes
- Do not cut growth CapEx to 0 while keeping aggressive volume growth
- Separate one-time catch-up from steady-state sustaining
CapEx % of sales forever, no story.
Sustaining CapEx + explicit growth projects with volumes tied to them.
Mini example
Sales flat. D&A $40. Total CapEx $100. Hypothesis: maintenance ~$45, growth ~$55 (catch-up + expansion). If the CIM calls all $100 "growth," push back.
Total CapEx
100
Maint. (est.)
~45
Growth (est.)
~55
If you capitalize maintenance that peers expense, EBITDA looks better and CapEx looks higher. Say you would normalize for accounting policy when comparing multiples and FCF yields.
Valuation and returns angle
For DCF, unlevered FCF should reflect the CapEx needed for the growth you assume. For PE returns, growth CapEx that earns above the cost of capital can still be good: just do not treat it as free. For credit, lenders often underwrite maintenance CapEx as near-mandatory when sizing free cash for debt service.
Common traps
- Equating D&A to maintenance forever
- Calling all CapEx growth because management said so
- Cutting CapEx in a downside case without cutting volume
- Ignoring software, leases, and capitalized labor that sit outside classic PP&E
- Comparing EV/EBITDA across peers with different capitalize-vs-expense policies
Industry color that helps in interviews
Retail and restaurants: maintenance is refresh cycles, HVAC, roofs, POS; growth is new units and remodels that raise contribution. Industrials: sustaining is replacement of worn equipment; growth is new lines and automation projects with throughput gains. Software-ish hybrids: capitalized R&D and internal-use software muddy the split; ask what is required to keep current ARR stable versus what expands the product.
If management says maintenance is below D&A for years while volumes are flat, ask how the asset base is not aging into a cliff. Either productivity rose, assets were overbuilt historically, or deferred maintenance is accumulating.
How to talk about FCF bridges
Walk a simple bridge aloud: EBITDA to cash taxes, to NWC, to maintenance CapEx, to growth CapEx, to free cash. Label each bucket. Interviewers care that growth CapEx is optional in a no-growth case and mandatory in a growth case. That single distinction separates memorized formulas from underwriting judgment.
Interview follow-ups to expect
| Follow-up | Clean direction |
|---|---|
| Is D&A a floor or ceiling? | Neither; a noisy proxy, often low in inflation |
| What if CapEx > D&A forever? | Either growth, catch-up, or inflationary replacement |
| How does this hit EV/EBITDA? | CapEx-heavy peers can look cheap on EBITDA and rich on FCF |
| LBO downside? | Keep maintenance; cut growth with volumes |
25-second verbal
"Maintenance CapEx keeps the existing engine running. Growth CapEx buys new engines. I value the firm on cash after sustaining CapEx and I only credit growth CapEx when the operating case includes the associated volumes and returns."
Related
Operating Diligence KPIs and Unlevered vs Levered FCF. For deal math context, see Walk Me Through an LBO.
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