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Understand, In Practice, How Credit Card Revolving Interest Is Applied, Why There Are Interest on Interest, and What Is the Limit on Charges After the New Rules.
The interest on credit card revolving follows the logic of compound interest: when you do not pay the full invoice, the interest for the following month is charged on the outstanding balance already increased by previous charges. Since January 2024, there is a legal ceiling that limits the evolution of this debt the total charge (principal + interest + charges) cannot exceed 100% of the original amount.
In practice, revolving credit remains expensive and high risk, but the debt does not grow indefinitely. This is not new as since 2024, as reported by Jusbrasil, after 30 days in revolving credit, the issuer must offer installment plans with interest conditions lower than those of revolving credit, which changes the dynamic of debt extension and shortens the time spent in this modality.
What Is Revolving Credit and Where Do Interest on Interest Come In
You enter revolving credit when you pay less than the total invoice, but at least the minimum required.
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The unpaid difference becomes an outstanding balance in revolving credit, on which compound interest applies in the following month.
This is “interest on interest”: the new interest is calculated on a balance that already contains interest from the previous period.
Why does this happen? Because revolving credit is a very short-term and high-risk credit for the issuer, priced with rates significantly higher than other lines.
Without control, this dynamic would lead to explosive debts; therefore, the 100% ceiling was established to limit the total growth of the obligation.
What Changes with the 100% Ceiling and Mandatory Installments
According to the portal Jusbrasil, starting in January 2024, the rule is straightforward: the total debt cannot exceed double the original amount.
Example: if you entered revolving credit with R$ 500, the maximum that can be charged (principal + interest + charges) is R$ 1,000.
This limit applies to debts incurred from 2024; previous debts do not automatically apply and must be renegotiated with the issuer.
Additionally, after 30 days in revolving credit, the bank cannot keep the customer indefinitely in this modality.
They must offer an installment plan with lower interest than that of revolving credit. Attention: it’s a cheaper alternative than revolving credit, but still incurs costs; the switch does not eliminate the charge but only reduces the speed of growth of the debt.
How Debt Grows: The Cycle in Three Steps
In the first month, by paying only part of the invoice, the remainder enters revolving credit and starts to incur interest.
In the following month, if you do not settle the total, interest is charged on a balance already increased by previous interest exactly the mechanism of interest on interest.
From the second month on, the issuer is required to offer installments, interrupting the continuous stay in revolving credit.
The 100% ceiling acts as an “emergency brake”: even with compound interest, the total does not exceed double the original amount.
This does not lower the cost of revolving credit; it only prevents the endless snowball effect.
How Much It Costs: Interest Rates and Impact on Your Wallet
Even with the ceiling, revolving credit remains among the most expensive modalities in the country.
In 2024 and 2025, the average annual rates for revolving credit remained very high, showing that the risk of indebtedness continues to be high while the invoice is not paid or switched to installments.
In parallel, the average rate for installments is lower than that for revolving credit, but remains significant, requiring planning to avoid prolonged income depletion.
The central point is financial behavior: small amounts in revolving credit, repeated over several cycles, consume a significant portion of the budget.
If the income is already pressured by other debts, the chance of delay and new rollover increases, even with the ceiling in place.
Who Is Affected, Where Charges Apply, and Why the Rule Exists
Who enters revolving credit? Consumers who cannot pay the full invoice and choose to pay only the minimum.
Charges occur throughout Brazil, as it is a national rule that standardizes issuers’ behavior.
Why was the rule created? To contain overspending, reduce distortions, and force less burdensome alternatives after 30 days.
Instead of rolling over revolving credit for months, public policy pushes consumers towards more predictable installments with lower rates than those of revolving credit.
Best Practices to Reduce the Cost of Interest on Credit Card Revolving Credit
Always pay the full invoice when possible. If not, make advance payments in the days following; most issuers recalculate charges up until payment date, reducing the accrued interest.
Switch from revolving credit to installments at the first offer: the rate is lower and predictability increases.
If your budget remains tight, compare cheaper credit alternatives (for example, personal loans) to clear the card only proceed if the Total Effective Cost is lower than the installments of the card.
Organize your cash flow (due date aligned with salary day, limits adjusted) and avoid long installments that “tie” the limit and push you into revolving credit in emergencies.
Questions Readers Usually Have Answered Naturally
Is Interest on Interest Illegal? No. In revolving credit, interest is compounded by definition, but the total charged is now limited: it cannot exceed 100% of the original amount of the debt incurred starting in 2024.
Does the ceiling eliminate interest? No. It limits growth. If you do not pay, the debt can double and then stop growing in nominal terms but continues to exist and will need to be settled.
The 100% ceiling and mandatory installments change the “how” debt grows, but do not make revolving credit cheap.
Interest on credit card revolving credit remains among the highest in the market, and interest on interest continues to occur up to the legal limit.
The winning strategy is to avoid entering revolving credit, migrate to cheaper installments when necessary and accelerate repayment with prepayments whenever there is leeway in the budget.
Do you think that the 100% ceiling really protects the consumer or just changes the way of charging?
Share in the comments how credit card revolving interest has impacted your budget; your experience can help others decide between installment, prepayment, or seeking cheaper credit.
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