Credit & Debt
Good Debt vs Bad Debt
Not all borrowing is equal - a framework for telling debt that builds value from debt that just costs money.
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“All debt is bad” is a simple, memorable rule, but it isn’t quite accurate - and the more useful, more nuanced version of that rule distinguishes clearly between debt that can genuinely build long-term value and debt that simply costs money over time, with nothing durable left behind to show for it.
The basic test worth applying
The clearest signal for sorting debt is what the borrowed money actually goes toward. Debt used to acquire an appreciating asset - something genuinely likely to hold or grow in value over time, like a reasonably priced education that measurably increases future earning potential, or in many markets, a home purchased on sound terms - is generally considered “good” debt, assuming the terms themselves are sound and the payments are genuinely manageable within a real budget. Debt used for a depreciating asset, or for something that leaves nothing durable behind at all, like a vacation or everyday spending simply charged to a credit card, is far harder to justify, because there’s no lasting value on the other side of the ledger to offset the interest being paid.
Imagine two people each borrow $15,000. One uses it to complete a professional certification that reliably increases their salary by $8,000 a year going forward - the loan effectively pays for itself within two years and keeps paying dividends for a career afterward. The other uses the same $15,000 to fund an elaborate vacation, charged across several credit cards. Both are technically "debt" of an identical size, but only one of them leaves anything behind once the loan itself is eventually paid off.
Leverage cuts in both directions
Leverage means using borrowed money to increase your buying power well beyond what your own cash savings alone would allow - a mortgage is the classic, everyday example, letting an ordinary buyer control a home worth far more than their available savings could ever purchase outright. Leverage can genuinely accelerate good financial outcomes, but it accelerates bad ones just as effectively and just as fast - it’s precisely what makes both the best and the worst financial decisions bigger in scale than they otherwise would have been without any borrowing involved at all.
Interest rate matters more than the category label
Labeling a category of debt as "good" doesn't automatically excuse a genuinely bad interest rate attached to a specific loan within that category. A student loan carrying an unusually high rate, or a mortgage taken on with unfavorable terms, can still turn out to be a poor decision even though the underlying category is typically sound. Conversely, a very low, genuinely promotional-rate loan used briefly and paid off exactly on schedule can be perfectly reasonable, even for something that wouldn't normally earn the "good debt" label at all. The category is a useful starting heuristic, never a substitute for actually checking the specific rate and terms in front of you.
A practical framework for deciding
Before taking on any new debt, it helps to ask three concrete questions in sequence: does this genuinely create or protect value that extends meaningfully beyond the purchase itself? Is the interest rate on offer genuinely reasonable given current market conditions, not simply the first rate offered? And could the resulting payments be handled comfortably even if income dropped unexpectedly for a few months? Debt that clearly passes all three of these questions is generally worth serious consideration. Debt that fails even one of them deserves real hesitation and further thought before proceeding.
Why this framework matters for the rest of this module
The remaining lessons in this module - student loans, debt repayment strategies, credit reports, falling behind, co-signing, and bankruptcy - all assume this basic good-versus-bad framework as a starting foundation. Recognizing which category a specific debt decision falls into, before signing anything, makes every subsequent decision covered later in this module considerably easier to navigate with confidence.
- "Good" debt typically funds an appreciating asset or something that builds lasting value, like education or a sound home purchase.
- "Bad" debt typically funds a depreciating asset or ordinary spending, leaving nothing durable behind.
- Leverage amplifies outcomes in both directions - it makes good decisions better and bad decisions worse.
- A "good debt" category label never excuses a genuinely bad interest rate or unfavorable terms.
- Ask whether debt builds value, carries a reasonable rate, and stays affordable even if income drops.