A debt of 2,500 euros on a credit card with an annual equivalent rate of 22% can turn into a total payment of 5,444.84 euros if the holder limits themselves to paying 50 euros monthly. The credit would take 109 months to disappear: more than nine years to repay an amount whose final cost would exceed double the amount borrowed.
The difference is 2,944.84 euros in interest, calculated without new purchases, fees, insurance, or additional expenses. If during that period the card continues to be used, the result can worsen.
The so-called "revolving" cards allow for payment to be split into small, fixed installments or calculated as a percentage of the debt. The problem arises when the monthly payment barely covers the interest and only reduces a minimal part of the outstanding money.
The Bank of Spain warns that this system can prolong repayment for years and turn an apparently manageable credit into a particularly costly debt.
What happens when only the minimum payment of the card is made
Each monthly payment is distributed between the generated interest and the repayment of the outstanding capital. The lower the payment, the less money is allocated to reducing the debt.
On a card with 2,500 euros outstanding and an APR of 22%, the first month generates approximately 41.77 euros in interest. If the payment is 50 euros, only 8.23 euros reduce the borrowed capital.
The following month, interest is recalculated on the debt that remains outstanding. Although the balance decreases slowly, the process drags on and the accumulated cost increases.
The Bank of Spain explains that these cards can operate with a fixed payment or a percentage of the debt. Therefore, there is no universal minimum payment: it depends on the conditions agreed upon with each entity.
How much does a debt of 1,000, 2,500, or 5,000 euros cost
The following simulations show what happens when reduced monthly payments are maintained with different interest rates. The calculations use a APR of 12%, 18%, and 22%, without fees, new withdrawals, insurance, or defaults.
| Initial debt | APR | Monthly payment | Necessary time | Total interest | Total paid |
| 1,000€ | 12% | 25€ | 51 months | 263.54€ | 1,263.54€ |
| 1,000€ | 18% | 25€ | 59 months | 469.76€ | 1,469.76€ |
| 1,000€ | 22% | 25€ | 67 months | 665.07€ | 1,665.07€ |
| 2,500€ | 12% | 50€ | 69 months | 905.84€ | 3,405.84€ |
| 2,500€ | 18% | 50€ | 86 months | 1,797.70€ | 4,297.70€ |
| 2,500€ | 22% | 50€ | 109 months | 2,944.84€ | 5,444.84€ |
| 5,000€ | 12% | 100€ | 69 months | 1,811.66€ | 6,811.66€ |
| 5,000€ | 18% | 100€ | 86 months | 3,595.47€ | 8,595.47€ |
| 5,000€ | 22% | 100€ | 109 months | 5,889.89€ | 10,889.89€ |
The most expensive case is that of an initial debt of 5,000 euros with an APR of 22% and a payment of 100 euros. The client would end up paying 10,889.89 euros, of which 5,889.89 correspond solely to interest.
In that assumption, the interest even exceeds the amount initially financed. And the calculation starts from a favorable condition: that the card is no longer used at all from the first month.
The figures are mathematical simulations and do not represent concrete offers from any entity nor prejudge the validity of a specific contract.
How much money is saved by increasing the monthly payment
Increasing the monthly payment reduces the outstanding capital more quickly and decreases future interest. The difference can be considerable even with moderate increases.
For a debt of 2,500 euros at 22% APR, these are the results if the initial payment of 50 euros increases by 20%, 50%, or 100%:
| Monthly payment | Time to pay | Total interest | Saving compared to paying 50€ |
| 50€ | 109 months | 2,944.84€ | |
| 60€ | 72 months | 1,813.94€ | 1,130.90€ |
| 75€ | 50 months | 1,184.74€ | 1,760.10€ |
| 100€ | 33 months | 763.83€ | 2,181.01€ |
Paying only 10 euros more each month would allow saving 1,130.90 euros in interest and reduce the term by more than three years.
Doubling the payment to 100 euros would cut the duration from 109 to 33 monthly payments. The saving would reach 2,181.01 euros.
Banking regulations precisely require facilitating simulations of this type when certain conditions are met. The Order EHA/2899/2011 establishes that entities must inform about the result of increasing the payment by 20%, 50%, and 100%, in addition to indicating which monthly payment would allow settling the debt in one year.
When the minimum payment does not even cover the interest
In certain circumstances, the monthly payment is insufficient to pay the generated interest. Then, the debt does not decrease: it increases.
For example, a debt of 5,000 euros at 22% APR generates approximately 83.54 euros of interest during the first month.
If the client paid a fee of 75 euros, there would be 8.54 euros missing to even cover those interests. Without modifications to the conditions, the outstanding balance would increase and the debt could not be settled with that monthly payment.
The official simulator of the Bank of Spain expressly warns that a fee lower than the generated interests may prevent the amortization of the credit.
The situation may worsen when commissions, linked insurance, new purchases, cash withdrawals, or late payment interests are incorporated.
The additional risk of paying a percentage of the debt
Some cards do not establish a fixed amount, but rather a percentage of the outstanding balance. In that case, the fee usually decreases as the debt reduces, which can further prolong the repayment.
For example, with an initial debt of 2,500 euros at 18% APR, a fee equivalent to 3% of the balance and a minimum of 20 euros, the first payment would be 75 euros.
However, the monthly payment would decrease as the balance decreased. Under those conditions, the debt would take 127 months to disappear and would generate 1,815.11 euros in interests.
If the client maintained a fixed fee of 75 euros, without reducing it later, it would end in 46 months and pay 880.36 euros in interests.
The difference amounts to 934.75 euros additional for allowing the fee to decrease progressively.
This calculation is based on a specific assumption: each monthly payment is equivalent to 3% of the existing balance at the beginning of the period, with a floor of 20 euros. The actual conditions depend on each contract.
What information can be requested from the bank
The entity must periodically provide information about the credit used, the interest rate, and the situation of the debt.
The Bank of Spain reminds that the client can request:
- The total amount used and the outstanding debt.
- The applied interests and the commissions charged.
- The details of the payments made.
- The amortization table corresponding to the existing balance.
- The expected cancellation date if the current fee is maintained.
- The savings simulations if the monthly payment increases.
- The fee necessary to settle the debt in one year.
When the holder requests this information, the entity has a maximum period of five business days to provide it, according to the regulation set forth in the BOE.
Furthermore, Article 30 of the Law 16/2011 on consumer credit contracts recognizes the right to repay the credit early, either totally or partially, with the corresponding reduction of future interests and costs.
The possible compensation for early repayment depends on the contract and the requirements established in the law itself.
What happens with the 22% limit announced by the Government
The Government approved in January 2026 a draft bill to reform the regulation of consumer credit, including "revolving" cards.
According to the Ministry of Economy, the text includes a temporary limit of 22% APR until the definitive system of caps by tranches is approved.
However, the approval of a draft bill does not equate to the entry into force of a law. The ministry itself presents the measure as part of a regulatory proposal and links its application to the approval and validity of the corresponding regulation.
Therefore, it cannot be stated that any card that automatically exceeds 22% is illegal solely due to the government announcement. To determine what limit is enforceable, it is necessary to check the contract, its date of formalization, and the effectively published and in-force regulations.
The Supreme Court has also established criteria to examine "revolving" cards from the perspective of usury and lack of transparency, but the nullity of a contract is not determined exclusively by an isolated figure nor is it for the Bank of Spain to declare it.
How to get out of a debt that keeps growing
The first step is to check the outstanding balance, the APR, and what part of each installment is actually allocated to amortizing capital.
Then, it is advisable to consider these measures:
- Stop using the card while there is outstanding debt.
- Increase the monthly payment, as long as the family budget allows.
- Request the bank for simulations with different monthly payments.
- Compare the cost of the card with other financing alternatives and their fees.
- Make early repayments when possible.
- Review if there are insurances, fees, or linked services that increase the operation's cost.
- Request specialized advice if the contract could contain abusive conditions.
If the entity does not provide the information or there are discrepancies regarding the charged interests, a complaint must first be filed with its customer service.
The Bank of Spain explains the complaint procedure: for issues related to consumer credit, the consumer can go to the supervisor if the entity does not respond within one month or if the response is not satisfactory.
However, the agency itself warns that it does not have the authority to declare abusive or annul contractual clauses. Such disputes may require legal advice and, if applicable, a judicial claim.