Why "good debt versus bad debt" is a bad test

The label describes the purchase, not the loan

The standard advice sorts borrowing into two bins. Good debt buys something that grows in value or earns income: property, education, a business. Bad debt buys something that loses value or gets consumed: a holiday, furniture, a phone, restaurant meals on a card.

It is a memorable rule and it is the wrong unit of analysis. The label is attached to the thing you bought. The obligation is attached to you.

Consider what the label cannot see. It cannot see the interest or profit rate. It cannot see the term. It cannot see the size of the monthly payment relative to your income. It cannot see whether the payment is fixed while your income is variable. It cannot see what happens if you miss a payment, whether an asset is pledged, whether someone guaranteed it for you, or whether default triggers something in another agreement.

Two people can borrow for the identical "good" purpose on terms that differ so much that one is comfortably manageable and the other is a slow-motion problem. The label rates them the same. That is not a small imprecision. It is a rule that gives the same answer to two questions with opposite answers.

What the framing gets right

It is worth taking the idea seriously before discarding it, because it is not pure nonsense. There are three defensible instincts buried inside it.

The first is duration matching. Borrowing over twenty years to buy something with a twenty-year life is structurally more coherent than borrowing over twenty years to buy something consumed in a weekend. If the repayment period outlives the usefulness of the thing, you spend years paying for something you no longer have. This instinct is real and worth keeping.

The second is the possibility of a return. If borrowing lets you acquire something that produces income or saves a larger cost, the arithmetic can work in your favour. Financing equipment that lets you earn is a different proposition from financing a purchase that only costs.

The third is a rough proxy for recoverability. If the borrowing is secured against an asset you could sell, you have an exit, however unattractive. Unsecured borrowing against nothing leaves you with only your income as the way out.

All three of these are real. None of them is what the label actually measures. The label measures the category of purchase and then assumes the three properties follow. Frequently they do not. A mortgage taken at a stretch on a property you cannot sell quickly fails the recoverability test entirely, while a small unsecured amount you could clear from savings tomorrow passes it easily.

There is a fourth argument that travels badly. Much of the popular good-debt literature comes from tax systems where interest on certain borrowing is deductible against personal income, which genuinely changes the after-tax cost. Whether any such treatment applies to you depends entirely on the tax rules where you live and earn. Check the applicable tax authority rather than importing the conclusion.Source^source

Four properties that actually decide whether a debt hurts you

Replace the two bins with four questions. Each one has a number or a concrete answer, and none of them care what you bought.

Price

What does the credit cost in total, expressed as an amount, not as a monthly payment?

The monthly payment is a comfort number. It is designed to be reassuring and it can be made smaller almost indefinitely by extending the term. The total cost of credit is the number that tells you what you paid for the privilege of paying later.

Calculate it directly: multiply the payment by the number of payments, add every fee, subtract the amount financed. That difference is the price. Then express it as a percentage of the amount borrowed so you can compare offers of different sizes.

Claim

What share of your income does the required payment take, and for how many months?

This is the property that regulators and central banks actually track. Debt burden is conventionally measured as required debt payments relative to income, a ratio that makes no distinction whatsoever between a mortgage and a furniture instalment.Source^source In regulated consumer lending, affordability assessment works from income, existing obligations, dependants and living costs, again without reference to the moral category of the purchase.Source^source

Two loans with the same claim on your income constrain your life by the same amount. If 30 per cent of your income is committed for six years, that is true whether the 30 per cent went to a degree or a sofa.

Cushion

What happens to the payment if your income falls?

Run one specific scenario rather than a vague sense of security. Suppose your income drops by a third for six months. Can you still make every required payment from income and reserves without new borrowing? If not, how many months until the first missed payment?

Also ask what flexibility exists inside the contract. Can the payment be reduced, deferred or restructured, and on what terms? A debt with a formal hardship route is materially less dangerous than an identically priced debt with none.

Consequence

What actually happens if you do not pay?

This is the property people examine last and should examine first. Map it concretely:

• Is an asset pledged, and would losing it disrupt your ability to earn or to house your family?
• Did anyone guarantee the loan for you, so that non-payment moves the problem to another household?
• Is the borrowing linked to your employment or salary transfer in a way that couples a job change to a credit problem?
• Does default under this agreement trigger consequences under another agreement you hold?
• What is recorded, for how long, and how would it affect future borrowing?

A cheap debt with a severe consequence can be more dangerous than an expensive debt with a mild one. Price and consequence are independent variables, and the label collapses them into one.

Two "good" debts that fail the test

Take a hypothetical household earning 20,000 a month after deductions.

The first borrows to buy property. The purchase is at the top of what was approved, and the required payment is 9,000 a month for twenty years. Run the test. Price: large, because a long term multiplies even a modest rate into a substantial total cost of credit. Claim: 45 per cent of income for 240 months, leaving little room for anything else. Cushion: if income falls by a third to roughly 13,300, the payment alone consumes more than two thirds of it. Consequence: the asset is pledged, and it is the family home, so the worst case is both a financial and a housing event, and property may not sell quickly at a price that clears the loan.

This is textbook good debt and it fails three of four properties.

The second borrows for a qualification. Suppose 80,000 financed over four years, with the course delivered part-time while working. Price: moderate. Claim: manageable. Cushion: adequate. Consequence: unsecured. So far this passes. The failure is elsewhere: the qualification is not recognised by employers in the market where the person actually works, so the expected income increase does not arrive. The debt is fine; the investment thesis was never tested. The label said "education, therefore good" and stopped asking.

That second case exposes a further weakness. Calling borrowing good because the purchase might appreciate imports an assumption about the future into a decision about a contract. The contract is certain. The appreciation is a forecast.

Two "bad" debts that pass it

Now the reverse. Suppose the same household finances a 6,000 laptop needed for work over twelve interest-free instalments, with a one-off fee of 180. Price: 180 in absolute terms. Because the balance amortises, the average amount outstanding across the year is roughly 3,250, so the fee is equivalent to something in the region of five and a half per cent for the year. Small, but not zero, and worth knowing rather than believing the marketing word "free". Claim: 500 a month, or 2.5 per cent of income, for twelve months. Cushion: the household holds enough to clear the balance at any point. Consequence: unsecured, modest, nothing pledged.

By the label this is bad debt financing a depreciating consumer item. By the test it is a small, short, cheap, reversible obligation with a known exit.

Second example: an unexpected medical cost of 2,500 placed on a card and cleared in full before any charge accrues. Price: zero if genuinely cleared in the grace period. Claim: one month. Cushion: full. Consequence: none. The label calls it bad debt because a card was involved. The test calls it a payment method.

None of this means unsecured revolving credit is harmless. The identical card, carrying a balance at a high rate for years with only minimum payments, fails the price test badly and fails the cushion test because minimum payments barely reduce principal. The instrument is not the point. The way it is used, priced and repaid is the point.

Running the test on an actual offer

Here is the process end to end, using hypothetical figures so the method is visible.

Suppose you are offered 60,000 over 48 months at a payment of 1,600, with a 1 per cent arrangement fee.

1. Price. Total repayments are 76,800, plus 600 in fees, against 60,000 financed. The cost of credit is 17,400, which is 29 per cent of the amount borrowed, spread across four years.
2. Claim. On income of 20,000, the payment takes 8 per cent of income for 48 months. Add any existing commitments to get your total claim, because lenders will.
3. Cushion. At income of 13,300 the payment becomes 12 per cent. Uncomfortable but survivable if other commitments are modest. Check whether the contract permits deferral, and at what cost.
4. Consequence. Establish whether anything is pledged, whether a guarantor is involved, and what is reported on non-payment.

Now compare that against an alternative offer of the same 60,000 over 72 months at 1,180 a month. The payment is friendlier and the claim drops to under 6 per cent, but total repayments become 84,960, so the price rises by more than 8,000. The longer term also extends the period during which a shock can reach you. That is the trade you are actually making, and neither option is "good debt" or "bad debt". They are different distributions of price, claim and exposure time.

Where the label does real damage

Two failure modes follow from the good and bad framing, and they are mirror images.

On the good side it licenses over-borrowing. If a category is pre-approved as virtuous, the size of the commitment stops being scrutinised. People stretch to the maximum offered because the purpose was blessed in advance. The largest personal financial difficulties usually involve borrowing everybody agreed was sensible.

On the bad side it produces shame, and shame is expensive because it delays action. Someone carrying a balance they believe marks them as irresponsible is less likely to call the lender early, ask about restructuring, or tell their household. Every one of those delays makes the arithmetic worse. Regulated lenders operate under consumer protection obligations and have processes for customers in difficulty; using them early is a rational act, not a confession.Source^source

Replacing a moral vocabulary with a measurement vocabulary removes both failure modes at once. Debts are not virtuous or shameful. They are expensive or cheap, heavy or light, survivable or not, and reversible or not.

Which debt to clear first

The label is also unhelpful as a repayment ranking, and this is where people lose real money.

Two conventional methods exist. Ordering by highest rate first minimises total cost. Ordering by smallest balance first produces earlier visible wins, which some people find sustains the effort. Both are defensible; the arithmetic favours the first, the behaviour sometimes favours the second.

Add one override that outranks both. Any debt where non-payment carries a disproportionate consequence goes first, regardless of its rate or balance:

• borrowing secured against something you need to live or to earn;
• anything a family member or friend guaranteed for you, because their exposure is not yours to gamble with;
• anything tied to your employment or immigration position;
• anything already in arrears where penalties are accruing faster than the underlying rate;
• anything where default cross-triggers another agreement.

None of these appear anywhere in a good and bad debt classification. All of them matter more than the classification does.

What this test cannot tell you

The four properties will tell you what a borrowing contract does to your cash flow, how much slack you retain, and what the downside looks like. They will not tell you whether the underlying purchase is worth making, whether an asset will rise in value, whether a qualification will pay off, or whether a business plan is sound. Those are separate judgements and the financing decision should not be used to smuggle them past you.

This article does not recommend any lender, product or borrowing decision, and it does not assess your circumstances. Read the actual terms and key facts for any offer, confirm current rules and tax treatment with the relevant authority, and take qualified financial, legal or Sharia advice where your situation requires it.