Credit ads are designed to make you focus on the smallest number possible. A monthly payment of 89 euros sounds very different from a total cost of 5,340 euros. A 6% interest rate seems reasonable until you calculate what that percentage adds up to over ten years. Most financing decisions are made without doing those calculations.
It’s not ignorance — it’s design. Financial institutions present information in the way most likely to get you to sign. Your job as a borrower is to do exactly the opposite calculation: to know what you pay in total, not just how much you pay each month.
The interest rate is not the total cost
The most common mistake when evaluating a loan is focusing solely on the nominal interest rate. This number — the annual percentage rate before fees — represents the annual percentage applied to the outstanding capital to calculate interest. But it doesn’t include all the costs you’ll actually pay.
Opening fees, tied insurance policies, management charges, and other costs associated with the loan are not part of the nominal rate. They may be described in the fine print of the contract, in separate clauses, or presented as accessory requirements. The cumulative effect of these costs can be as large as the interest on the loan itself, or even larger for short-term credit.
A loan with a 4% nominal rate and a 2% opening fee on capital plus a mandatory life insurance policy can cost considerably more in total than one with a 6% nominal rate and no additional costs. Comparing nominal rates without accounting for everything else is comparing different things.
The APR: the only number that matters
The Annual Percentage Rate — APR — is the indicator that makes honest comparisons between financial products possible. European regulations require institutions to display it prominently because it captures all the costs of a loan in a single percentage: the interest rate, fees, and mandatory charges, expressed in annual terms.
When looking for a loan, the only number that matters for comparing different offers is the APR. Two loans with the same nominal rate can have very different APRs if one includes fees the other doesn’t. Two loans with different nominal rates can have similar APRs if their fees offset each other.
There’s an important limitation worth understanding: the APR assumes the loan is held to maturity and that conditions don’t change. If you repay early or if the rate is variable and changes, the actual final APR will differ from the one quoted. Even so, it remains the best comparison tool available at the time of signing.
The APR also depends on the term: the same loan has a different APR at 12 months versus 60 months, because fees are distributed differently. So when comparing offers, always make sure you’re comparing them at the same term.
The effect of loan term on what you pay in total
Loan term is the most underestimated variable in any credit analysis. Reducing monthly payments by extending the term seems like a benefit, but its real cost is very high.
Consider a 10,000 euro loan at 7% APR. At 3 years, the monthly payment is around 309 euros and the total paid is around 11,124 euros. At 5 years, the payment drops to around 198 euros, but the total rises to around 11,880 euros. At 7 years, the payment is around 151 euros and the total climbs to around 12,684 euros. The difference between 3 and 7 years is more than 1,500 euros you pay extra without getting anything more in return.
This is what financial institutions understand and most borrowers don’t factor in: extending the term reduces the pain of the monthly payment but significantly increases the bank’s benefit. The comfortable monthly payment is the mechanism that leads most people to pay more than necessary.
The general rule is to take the shortest term you can manage without compromising your liquidity — not the shortest in the abstract, but the one that keeps your financial situation stable even if your income temporarily drops.
How to calculate the real cost of a loan
Before signing any financing contract, it’s worth doing one simple but concrete calculation: the total cost of the loan.
Total cost is the sum of all the payments you’ll make plus all fees and additional charges, minus the capital you received. In other words, it’s exactly how much, in euros, that borrowed money costs you.
If you borrow 10,000 euros and by the end of the loan have paid 11,880 euros in installments plus 200 euros in opening fees, the real cost of the loan is 2,080 euros. That number — not the interest rate, not the APR — is what you actually need to know whether the loan is worthwhile compared to other options.
The relevant comparison isn’t always between loans. Sometimes the right comparison is between taking the loan and waiting until you have the money saved. If the loan costs 2,080 euros and the good or service you’re financing gives you no additional value for having it now versus in a year, those 2,080 euros are a pure expense.
When credit makes sense and when it doesn’t
Credit is a tool, not a problem in itself. It makes sense when the asset you’re financing generates value above its cost, when the alternative is significantly worse, or when timing is a critical factor.
A mortgage makes sense because you’re financing an asset that accumulates value, and in many cases the cost of the loan is lower than paying rent over the same period. A loan for education makes sense if that education increases your income by more than it costs. A business line of credit makes sense if the return on invested capital exceeds the cost of financing it.
Credit doesn’t make sense when it finances consumption that depreciates quickly — electronics, clothing, vacations — and the cost of credit exceeds any benefit from having it now. It also doesn’t make sense when the monthly payment represents such a high proportion of your income that it leaves you with no margin for emergencies.
Consumer debt — credit cards, consumer loans, installment purchases — is the most expensive and least advantageous form of financing available. Rates typically run between 15% and 30% APR. The cumulative impact of those rates on balances that aren’t cleared each month can turn a reasonable purchase into a financial burden that lasts for years.
Knowing the real cost of what you sign won’t necessarily stop you from taking credit. But it does change the conversation you have with yourself before doing so.
