Debt has a bad reputation, and often deservedly so, but treating all borrowing as equally harmful misses an important distinction. Some debt, used carefully, can help you build wealth and reach goals that would otherwise be out of reach. Other debt quietly drains your income and traps you in a cycle that is hard to escape. Learning to tell the two apart is one of the most valuable financial skills you can develop, because it turns borrowing from a source of anxiety into a tool you control.
What makes debt "good"
Good debt is borrowing that is likely to increase your net worth or income over time, and that is taken on terms you can comfortably afford. A mortgage on a reasonably priced home is a classic example, because it lets you build equity in an asset that may appreciate while giving you somewhere to live. A student loan that leads to a meaningful increase in earning power can also qualify, as can a sensible business loan that funds genuine growth. The common thread is that the borrowed money is expected to produce a return greater than its cost.
What makes debt "bad"
Bad debt is borrowing that funds consumption rather than investment, usually at a high interest rate, for things that lose value or disappear entirely. Credit card balances carried month to month, payday loans, and financing for depreciating purchases you cannot really afford are typical examples. The interest rates on this kind of debt are often so high that they overwhelm any benefit, and because the purchases do not generate income, there is nothing to offset the cost. This is the debt that keeps people awake at night.