Debt has a reputation as something to avoid at all costs. But the reality is more nuanced — some debt can genuinely build wealth, while other debt steadily erodes it. Understanding the difference is one of the most important concepts in personal finance. This guide explains how to tell good debt from bad debt and how to make smarter borrowing decisions.
What is good debt?
Good debt is borrowing that has the potential to increase your net worth or generate future income. The key characteristic is that the asset or benefit you acquire with the borrowed money is worth more than the cost of borrowing.
Classic examples of good debt include:
- Mortgage — borrowing to buy a home that appreciates in value over time. You're building an asset while paying off the loan. Over the long term, most properties increase in value significantly.
- Student loans — when the degree genuinely improves your earning potential, the lifetime income increase can far outweigh the cost of the loan. However this varies significantly by field of study and institution.
- Business loans — borrowing to start or grow a business that generates returns greater than the interest cost. Capital invested in a profitable business creates wealth.
- Investment property — borrowing to purchase property that generates rental income and appreciates. The rental income can cover the loan repayments while the asset grows in value.
What is bad debt?
Bad debt is borrowing to purchase things that depreciate in value or provide no lasting financial benefit. The asset — if there is one — loses value while you're still paying interest on the loan.
Classic examples of bad debt include:
- Credit card debt — carrying a balance on a credit card at 18–25% interest to fund everyday spending is one of the most costly financial habits. You're paying very high interest on things that often have no lasting value.
- Car loans on depreciating vehicles — cars lose value rapidly. Financing a car means you're paying interest on an asset that's worth less each year. A modest car bought in cash or with a small loan is far more financially sensible than financing a luxury vehicle.
- Personal loans for lifestyle expenses — borrowing for holidays, weddings, furniture, or electronics means paying interest on experiences and items that provide no financial return.
- Buy now, pay later schemes — can be interest-free if paid on time, but lead many people to spend more than they would have otherwise and can carry high late fees.
The grey area
Not all debt fits neatly into good or bad. A car loan is necessary for many people to get to work — without transport they couldn't earn income. In that context, it's less "bad" than it might otherwise be. The key question is always: does the economic benefit of borrowing outweigh its cost?
💡 The interest rate is a key factor in whether debt is good or bad. Even "good" debt becomes questionable if the interest rate is very high. Always compare the cost of borrowing against the expected return on what you're buying.
How to manage bad debt you already have
If you're carrying bad debt, the most important step is to stop adding to it and then pay it off as aggressively as possible. Two popular strategies:
- Avalanche method — pay off the highest-interest debt first while making minimum payments on others. This minimises total interest paid and is mathematically optimal.
- Snowball method — pay off the smallest balance first. This provides psychological wins that help maintain motivation. Less mathematically efficient but psychologically effective for many people.
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