Good Debt vs. Bad Debt: A Genuinely Useful Framework
"All debt is bad" is an oversimplification that can lead to overly conservative financial decisions. A more useful framework looks at what the debt is actually funding and its cost relative to realistic alternatives.
A working definition
Good debt generally finances something that increases in value or your earning potential over time, at a reasonable interest rate. Bad debt generally finances depreciating assets or consumption, often at a high interest rate, with no offsetting increase in value or income.
Common examples of typically "good" debt
Mortgages: real estate has historically appreciated over long time horizons in most markets, and mortgage rates are typically among the lowest available to individual borrowers. Student loans (with caveats): education that meaningfully increases earning potential can justify the debt, though this depends heavily on the specific field, cost, and realistic income outcome — not automatically true for every degree. Business loans for a viable, cash-flow-positive business: debt that funds a business generating returns exceeding the loan's interest rate can be a legitimate wealth-building tool.
Common examples of typically "bad" debt
Credit card debt carried month to month: often the highest-rate common debt (frequently 20%+ APR), financing consumption that provides no lasting value or income. Loans for depreciating consumer goods: financing items that lose value immediately and don't generate income, especially at high interest rates. Payday loans: typically carry extremely high effective interest rates and are generally considered one of the most costly forms of debt available.
Where the framework gets genuinely nuanced
Auto loans are a common gray area — a reasonably-priced, needed vehicle financed at a low rate for reliable transportation to work can be reasonable, while an expensive vehicle financed at a high rate purely for status is closer to "bad" debt, even though it's the same loan category. The framework depends on the specific terms and purpose, not just the debt type in isolation.
The interest rate threshold that matters most
A useful practical filter: compare the debt's interest rate against realistic long-run investment returns (historically around 7% real for a diversified stock portfolio). Debt costing meaningfully more than that is hard to justify as "good" regardless of what it's financing, while debt costing meaningfully less has a stronger case for being reasonable to carry rather than aggressively paying off.
Apply the framework to your own debts
The free Debt Payoff Calculator helps prioritize which debts to tackle first based on their real cost. If you're weighing whether to pay down debt or invest instead, our deep dive on that exact question walks through the full decision framework.