Good Debt vs. Bad Debt — How Loans Change Your Net Worth

Net worth is a simple number: everything you own minus everything you owe. Debt lives on the right-hand side — among the liabilities — and at first glance it only pulls the number down. But that is half the truth. One loan can stand behind an asset that grows; another simply disappears into consumption. That is why the right question is not "do I have debt," but "what kind of debt do I have."

This article distinguishes the two kinds of debt with two simple tests and shows how each of them affects the balance sheet and your net worth.

Quick recap: debt is the liabilities side

Net worth = assets − liabilities. Assets are everything of value you have; liabilities are everything you owe. Debt is exactly the liabilities side — and it lowers net worth by exactly its size. If you have not calculated it yet — here is how to work it out step by step.

So far debt sounds unambiguously bad. But the number on the balance sheet never stands alone: what matters is what sits opposite the debt on the asset side and how much the loan itself costs you. Context is everything.

Two tests for "good" and "bad" debt

There is no need to memorize long lists. Two questions do almost all the work:

Is there an asset behind the debt? A mortgage finances a home — an asset stands on the other side of the balance sheet. A consumer loan for a holiday leaves nothing behind: the memories are nice, but they are not an asset.
What is the interest relative to the benefit? A low-interest loan for something that grows or produces income is one thing. A high-interest loan for something that loses value every month is quite another.

Combine the two answers and the label appears almost on its own.

"Good" debt: a lever toward growth

"Good" debt works like a lever: with other people's money you acquire something that lifts your future net worth — and at a reasonable interest rate.

A mortgage for a home. Instead of rent you pay an installment, and the home is an asset on your side of the balance sheet. The mortgage liability is offset by the value of the property.
A loan for education or skills. If it genuinely raises your income, it pays for itself over the years — you invest in your most productive asset: yourself.

On the balance sheet the effect is key: the liability is offset by an asset, so the net result can be neutral or even positive.

"Bad" debt: it eats your net worth

"Bad" debt does the opposite: it finances consumption or fast-depreciating things, usually at a high interest rate, and leaves no asset on the other side.

Consumer loans for everyday expenses.
A revolving credit-card balance that carries over from month to month.
A car loan for a vehicle that loses value the moment it leaves the showroom.
"Buy now, pay later" for things that have no value tomorrow.

Here the liability grows, while nothing lasting stands on the asset side. Net worth falls — and keeps falling, because the interest piles up.

The interest test

If you remember one thing from this article, let it be this. Compare the interest on the debt with the return you can realistically earn elsewhere.

If the interest on the loan is higher than that return, paying off the debt is an investment — and one with a guaranteed "return" equal to the interest saved. The market may hand you a gain or a loss; the interest you avoid is certain, every time.

That is why high-interest consumer debt is a guaranteed negative result. Getting rid of it often beats most investments — because few investments promise a certain return, while paying off expensive debt delivers one ready-made. Why an uncertain return is never free is explained in risk and return.

And remember the other side of the wonder: compound interest works for you when you invest — and against you when you owe. The same force, turned the other way.

How it looks on the balance sheet

The numbers make it obvious. Compare two decisions.

You take out a €150,000 mortgage and buy a home for €150,000: liabilities and assets move together, so net worth barely budges at that moment. Then every installment you repay lowers the debt while the property remains — and net worth starts to grow.

You run up €5,000 on a credit card for everyday expenses: liabilities jump by €5,000, but no asset stands on the other side. Net worth falls by the full €5,000 — and the interest keeps pulling it down every month. The same instrument — debt — yet two opposite effects on the same number.

See it on your own numbers in the net-worth calculator — add your liabilities and watch how they weigh on the result.

The types of debt at a glance

Type of debt	Usually for	Asset on the other side?	Effect on net worth
Mortgage	A home	Yes — the home	Neutral/positive at a reasonable rate
Education loan	Higher income	Yes — skills/income	Positive, if the payoff is real
Consumer loan	Consumption	No	Negative
Credit card (revolving)	Everyday expenses	No	Strongly negative — high interest

A practical order

The order of the steps saves both nerves and money.

First build an emergency fund. The buffer is exactly what keeps you from falling into bad debt when a surprise arrives — without it, every crisis is paid for with a credit card.
Then pay off high-interest debt before you chase returns. While you carry an expensive balance, "investing" on the side is often like pouring into a bucket with a hole.
Only then direct your regular money toward your long-term goals.

What this does NOT mean

"Good debt" does not mean "free debt." Every loan carries risk and interest; the label depends on the rate and what stands opposite it.
This is not a recommendation. Selurio is an educational platform, not a financial adviser — it does not advise you to take out a loan or not.
The numbers are a guide. Your situation depends on your income, interest rates, and stability.

Continue reading

Subscribe to the newsletter and get new calculators and articles straight to your inbox — no signals and no spam.