What is three-year debt rule?
- The three-year debt rule measures whether your long-term debt can be cleared within three years of free cash flow.
- Divide total long-term debt by annual free cash flow to get your payoff time in years.
- A result of three or less means you pass the solvency test.
- The rule ignores interest rates and cash flow swings, so use it as a first filter, not a final answer.
What is three-year debt rule?
The three-year debt rule is a solvency test that says your long-term debt should be payable within three years of your free cash flow. Pass means you carry a manageable load. Fail means you are stretched thin.
The habit comes from Benjamin Graham's defensive-investor checklist. It answers the hardest question a lender asks: can the borrower clear what it owes before trouble starts? The rule forces you past profits and down to the cash that actually pays bills.
What counts as free cash flow?
Free cash flow is operating cash flow minus the capital spending needed to keep the business running. It is the money left after you fund growth and maintenance, the cash a company can truly spare. Net income flatters; free cash flow tells the truth.
Many people run the test on net income or earnings before interest and tax, and that is a mistake. A company can report steady profit and still starve for cash. Use free cash flow, or the test answers the wrong question.
Where the rule fits with other solvency tests
The three-year debt rule is one screen, not a verdict. Pair it with the current ratio, debt-to-equity, and interest coverage before you trust a pass. Each test catches a different failure, and together they map how much pressure is really on the balance sheet.
A pass here does not mean the maturities line up. Your long-term debt may be cleared in three years of steady cash flow and still come due all at once next quarter. Check the payment schedule, not just the average.
Its limits and the misconception
The rule assumes steady free cash flow, and few businesses deliver that. Cyclical firms, capital-heavy industries, and fast growers swing wildly from year to year, so a single snapshot can mislead. Use a multiyear average for a fair read.
Think of the rule as a first filter, not a buy signal. It keeps you away from leveraged load and points you toward solvency, but it never tells you a company is cheap or well run. Combine it with the rest of your checklist before you commit.