Capex vs Depreciation: Chronic Underinvestment and Capital Base Erosion
Quantitative study across 5,900+ balance sheets assessing reinvestment ratios, structural fixed asset consumption, and long-term valuation risks.
Key Technical Takeaways
- Applying the Reinvestment Ratio (Capex/Depreciation) to detect fixed asset replacement deficits.
- Modeling capital base erosion where sales grow while net property, plant, and equipment shrink.
- Accounting for reporting anomalies in equipment and vehicle rental firms where fleet acquisitions sit in operating cash flow.
1. Capital Reinvestment and Economic Depreciation
The relationship between capital expenditures (Capex) and fixed asset depreciation is governed by IAS 16 and IAS 7. For a going-concern enterprise:
- Growth Capex: Reinvestment Ratio $\frac{Capex}{Depreciation} > 1.0$, indicating net expansion of productive capacity.
- Maintenance Capex: Reinvestment Ratio $\frac{Capex}{Depreciation} \approx 1.0$, replacing consumed physical and technological assets.
- Chronic Underinvestment: Reinvestment Ratio $\frac{Capex}{Depreciation} < 0.70$ over consecutive years, indicating depletion of installed capacity to fund near-term cash payouts.
We evaluated 5,913 standardized annual filings submitted to the Brazilian Securities Commission (CVM) between 2010 and 2025 to measure multi-year reinvestment patterns.
2. Mathematical Modeling of Capital Reinvestment
Estimated Capex and the coverage ratio are defined as:
$$Estimated\ Capex_t = |Investing\ Fixed\ Asset\ Outflows\ (6.02.01)_t| \quad \lor \quad |Negative\ CFI\ (6.02)_t|$$
$$Reinvestment\ Ratio = \frac{Estimated\ Capex_t}{Depreciation\ Expense\ (7.04.01)_t}$$
We established two primary diagnostic thresholds:
Chronic Underinvestment: $$Fixed\ Assets \ge R$\ 50\ M \quad \land \quad Depreciation \ge R$\ 10\ M \quad \land \quad \frac{Capex}{Depreciation} < 0.70$$
Capital Base Erosion: $$Underinvestment\ Condition \quad \land \quad \Delta % Revenue_t > +5.0% \quad \land \quad \Delta % Fixed\ Assets_t < -5.0%$$
3. Historical Distribution in Listed Equities
The aggregate trajectory of fixed capital investment versus economic depreciation tracks broader commodity and industrial cycles:
| Year | Filings Analyzed | Aggregate Capex | Aggregate Depreciation | Median Capex / Deprec | Underinvestment Cases | Capital Erosion Cases |
|---|---|---|---|---|---|---|
| 2011 | 332 | R$ 259.4 B | R$ 93.4 B | 2.50x | 15 | 1 |
| 2014 | 311 | R$ 271.2 B | R$ 117.6 B | 1.70x | 30 | 4 |
| 2016 | 305 | R$ 239.8 B | R$ 154.2 B | 1.18x | 40 | 1 |
| 2018 | 307 | R$ 201.8 B | R$ 158.0 B | 1.54x | 41 | 4 |
| 2021 | 425 | R$ 340.2 B | R$ 261.5 B | 1.78x | 55 | 8 |
| 2023 | 441 | R$ 433.9 B | R$ 345.7 B | 1.33x | 75 | 8 |
| 2025 | 383 | R$ 505.4 B | R$ 390.3 B | 1.30x | 66 | 9 |
4. Notable Underinvestment Cases
Companies exhibiting the longest historical records of low reinvestment fall into two distinct operational profiles:
| Company | Years Analyzed | Deficit Years | % Historical | Median Capex / Deprec | Current Fixed Assets |
|---|---|---|---|---|---|
| Asa Branca Holding | 5 | 5 | 100.0% | 0.38x | R$ 370 M |
| Localiza Fleet | 8 | 8 | 100.0% | 0.13x | R$ 16.23 B |
| Tronox Pigmentos | 7 | 7 | 100.0% | 0.41x | R$ 150 M |
| Unidas Locações | 13 | 12 | 92.3% | 0.18x | R$ 10.71 B |
| Movida | 12 | 11 | 91.7% | 0.29x | R$ 24.16 B |
| Vix Logística | 16 | 14 | 87.5% | 0.20x | R$ 3.00 B |
| Rio Paranapanema Energia | 8 | 7 | 87.5% | 0.22x | R$ 2.32 B |
| Vamos Locação | 7 | 6 | 85.7% | 0.17x | R$ 16.00 B |
5. Sector Implications for Valuation Modeling
When constructing discounted cash flow (FCFF) models, analysts must adjust for structural classification quirks:
- Fleet and Equipment Rental: Show near-zero investing Capex because vehicle acquisitions pass through operating cash flow (CFO), creating an optical underinvestment signal on the CFI schedule.
- Mature Utilities: Concessionaires with fully amortized generation assets require minimal maintenance reinvestment, distributing 100% of organic cash generation to equity holders.
- Capital-Depleted Industrials: Manufacturing companies with multi-year Capex deficits face asset obsolescence, margin compression, and eventual operational failure.