You've probably heard the rule: a mortgage is good debt, a credit card is bad debt. It's a handy shortcut, and it's often right. But it can also lead people into a stretched mortgage they can't afford, or scare them away from a loan that would genuinely improve their life. The truth sits in the details.
The good debt vs bad debt idea is useful as a starting point. It gets you asking whether borrowing will leave you better or worse off. The problem is that the same type of debt can be helpful for one person and harmful for another.
Let's look at the classic framing, where it falls short, and a simple set of questions to ask before you borrow for anything.
What Is Considered Good Debt?
Traditionally, good debt is borrowing for something that's expected to grow in value or increase your income over time. Common examples:
- A mortgage, because a home may hold or grow its value, and you'd pay for housing anyway.
- Student loans, because education can lead to higher earnings.
- A business loan, because it may help create income.
What Is Considered Bad Debt?
Bad debt is usually borrowing for things that lose value quickly or get used up, especially at high interest rates:
- Credit card balances carried month to month.
- Payday loans and other very high-cost short-term borrowing.
- Finance on things that lose value, like expensive gadgets or holidays.
- Buy now, pay later plans that stack up and lead to late fees.
Why the Labels Can Mislead You
Here's where the simple version breaks down.
- A "good" mortgage can be a bad idea if the payments leave you with nothing for emergencies, or if you'd need to sell in two years and lose money on buying and selling costs.
- A student loan isn't always a win. It depends on the course, the likely earnings and how the loan is repaid where you live.
- A car loan can be sensible if a reliable car is how you get to a job that pays the bills, even though the car loses value.
- A 0% card deal can cost nothing if you clear it before the offer ends, and a lot if you don't.
So instead of labels, look at three things: the interest rate, the purpose and whether you can comfortably afford it.
How Much Does the Interest Rate Really Matter?
A lot. Here's the same $10,000 borrowed over five years with fixed monthly payments, at two different rates.
Same amount, same timeframe. At 20%, you pay about $4,000 more in interest. That's why a credit card balance at a high rate usually deserves attention before almost anything else. If you're working on that now, this guide to feeling calmer about money can help with the stress side of it.
A Better Way to Judge Debt
| Factor | Leans helpful | Leans harmful |
|---|---|---|
| Interest rate | Low and fixed | High or variable with no cap |
| Purpose | Builds value, income or essential stability | Pays for things used up quickly |
| Affordability | Payments fit easily with savings still happening | Payments squeeze essentials or need more borrowing |
| Timeframe | Clear end date you can stick to | Minimum payments with no real end in sight |
| Flexibility | You could overpay or exit without big fees | Heavy penalties for changing course |
6 Questions to Ask Before You Borrow
Run through these before taking on any new debt, big or small.
What's the total cost, not just the monthly payment?
Multiply the payment by the number of months. A $265 payment over 60 months is $15,900 in total. That's the real price.
Will this leave me better off in five years?
Think about value, income or genuine stability. A reliable car for work might pass. A sofa on high-interest finance probably won't.
Could I still afford it if my income dropped?
If a 10% pay cut or a quiet month would make the payment a struggle, the loan may be too big.
Can I wait and save instead?
Saving $200 a month for a year gets you $2,400 with no interest. Sometimes the best loan is a short delay.
Two more worth adding: What happens if I miss a payment? (fees, rate rises, effect on your credit record) and Is there a cheaper way to borrow this? Comparing a couple of options before signing often saves real money.
How Does Debt Affect Your Net Worth?
Every debt is a liability, so it reduces your net worth. What happens next depends on what you borrowed for.
Borrow $20,000 for a car and your net worth doesn't change on day one: you have a $20,000 car and a $20,000 loan. But the car may lose value faster than the loan shrinks, so your net worth can dip for a while. Borrow for a home and pay the mortgage down, and your equity grows with each payment. Borrow $3,000 on a card for a holiday, and your net worth falls by $3,000 plus the interest, because the holiday isn't an asset.
This is why listing debts next to assets is so useful. It shows whether borrowing is building something or just costing you. For homeowners, it's also worth thinking about whether to count your home in your net worth.
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Frequently Asked Questions
What is the difference between good debt and bad debt?
Good debt usually means borrowing at a reasonable rate for something that builds value or income, like a home or education. Bad debt usually means high-interest borrowing for things that are used up quickly. In practice, the interest rate and whether you can afford the payments matter more than the label.
Is a mortgage always good debt?
Not always. A mortgage can be helpful if the payments fit comfortably and you plan to stay long enough. It can become a problem if payments leave no room for savings or emergencies.
Is car finance good or bad debt?
Cars usually lose value, so car finance is often seen as bad debt. But a sensible loan for a reliable car you need for work can be reasonable. Keep the amount modest and the interest rate low.
Does debt lower your net worth?
Debt is a liability, so it's subtracted from your assets. If you borrow to buy something that holds its value, your net worth may not change much at first. If you borrow for something that's used up, your net worth falls by the amount borrowed plus interest.
Netvo is a private net worth tracker for iOS and Android. More from the blog.