Zombie Companies
A zombie company earns just enough to pay the interest on its debt but can't pay down the debt itself, often with an interest coverage ratio of 1 or less. It survives on cheap credit or support rather than healthy profits.
Some companies aren't dead, but they aren't really alive either. They keep operating, rolling over debt and paying interest, yet never generate enough to shrink what they owe. Economists call them zombies. Low interest rates let many survive; rising rates can push them over the edge. This entry explains how to identify zombies and why they matter to investors.
- Category
- Fundamentals and Macroeconomics
- Reading time
- 3 min
- Also called
- Zombie company, Zombie firms, Zombie stocks
- Updated
Zombie companies in plain words
A zombie company is an uncompetitive firm needing support to operate, or an indebted firm that can only cover interest on its debt — an interest coverage ratio of 1 or less.1
It generates only enough cash to pay interest and can't reduce the principal.1
The interest coverage ratio compares operating profit (EBIT) with interest expense.2
How to spot a zombie, step by step
Check interest coverage
Near or below 1×. See Interest Coverage Ratio.
Check debt trend
Is debt ever falling? See Debt-to-Equity Ratio.
Check profitability
Weak margins for years. See Profit Margins.
Check refinancing
Constant rollovers at rising cost.
Check cash flow
Little or negative free cash flow. See Free Cash Flow.
Stress-test rates
What if borrowing costs rise?
Worked examples
Example 1 — Coverage of 1
ZombieEBIT $20m, interest $20m, debt $400m.
| Coverage | $20m ÷ $20m = 1.0× |
| Left to repay debt | $0 |
With coverage at 1, the company only covers interest and can't reduce principal.1
Example 2 — Rates rise
Can't cover interestThe same company refinances $400m at 7% instead of 5%.
| New interest | $400m × 7% = $28m |
| Coverage | $20m ÷ $28m ≈ 0.71× |
Higher rates can push zombies into losses and default. See Rate Hike and Rate Cut.
Example 3 — A healthy comparison
HealthyAnother firm: EBIT $60m, interest $10m.
| Coverage | 6× |
Comfortable coverage leaves room to repay debt and invest. See Interest Coverage Ratio.
Zombie vs healthy company
| Aspect | Zombie | Healthy |
|---|---|---|
| Interest coverage | ≤ 1× | Comfortably above 1× |
| Debt trend | Rolled over, not repaid | Falling or stable |
| Investment | Minimal | Ongoing |
| Rate sensitivity | Very high | Moderate |
Why investors watch zombies
Avoiding value traps
Cheap stocks that never recover. See Margin of Safety.
Short ideas
Weak balance sheets. See Short Selling.
Credit risk
Default candidates. See High-Yield Bonds.
Macro analysis
Zombies grow when rates stay low. See Interest Rate.
Advantages and disadvantages
Advantages
- Simple warning sign to screen for.
- Highlights rate sensitivity.
- Useful for credit analysis.
Disadvantages
- Some turn around.
- Coverage can be distorted by one-offs.
- Definitions vary between studies.
Going deeper
Read as far as you need. Each level builds on the one before it.
Living on credit
Beginner
Zombies can't reduce principal because their cash flow only covers interest.1
Lender risk
Intermediate
Lenders use interest coverage to judge how risky it is to lend to a company.2 See Credit Rating.
Economic drag
Advanced
Zombies tie up capital and workers that could go to more productive firms, which some economists link to slower growth. See Macroeconomics.
Common mistakes
Buying because it looks cheap
Low valuation may be deserved.
Ignoring refinancing dates
Maturity walls can trigger defaults.
Using one year's data
Look at several years.
Forgetting rates
Rising rates change everything.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- Zombies can only service interest, not repay debt.
- Interest coverage of 1× or less is the usual test.
- Low rates help them survive.
- Rising rates can push them into default.
- Cheap valuations can be traps.
Frequently asked questions
Why do zombie companies exist?
Can a zombie company recover?
Are zombie stocks good short candidates?
Further learning
- Interest Coverage Ratio
The key test.
- Altman Z-Score
A broader distress score.
- Free Cash Flow
Cash after investment.
- Bankruptcy
Where zombies can end up.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- Corporate Finance Institute. Zombie Company (opens in a new tab) Checked .
- Corporate Finance Institute. Interest Coverage Ratio (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.