Total Effective Cost (CET): what it is and how to compare loans

Educational content; not a recommendation for any individual credit product. Credit terms vary by institution, borrower profile and date; confirm the CET in the offer before signing.

When comparing loans and financing, looking only at the interest rate can lead you to choose the most expensive offer. The Total Effective Cost (CET) exists precisely to prevent this: it brings together, in a single annual percentage rate, all the costs of the transaction — interest, fees, taxes, insurance and other charges billed to the customer. In this guide, you will understand what goes into the CET, why it is the best comparison yardstick, and how to check it before signing any contract.

What is the CET

According to the Banco Central (Brazilian Central Bank) Financial Citizenship Glossary, the CET is a "rate expressed as a percentage that corresponds to all charges and expenses incurred in credit transactions," including:

• Interest rate — the basic cost of borrowed money;
• Fees — such as credit assessment, registration or contract issuance charges;
• Taxes — such as IOF (Tax on Financial Operations);
• Insurance — when required or bundled with the transaction;
• Other expenses — any cost charged to the customer as part of the arrangement.

The CET is expressed as an annual percentage and reflects the conditions in effect on the calculation date. This means it can change if the terms of the offer change. In some disclosures, the value may also appear as an equivalent monthly rate — what matters is that the calculation basis is clear in the offer.

Why compare CET and not just interest

The interest rate is only part of the cost. Fees, taxes and insurance can make a loan with nominally lower interest more expensive. The Central Bank itself describes the CET as "the most powerful instrument for comparing the cost of a credit transaction."

A didactic example, published by the Central Bank and Senacon in a 2014 bulletin, shows the effect: a loan with 12% annual interest, but with a R$ 50 fee and R$ 10 in IOF, had a CET of 43.93% per year. In other words, the extra costs more than tripled the apparent cost. The figure is illustrative and does not reflect current market conditions — but the mechanism still holds: two offers with similar interest rates can have very different CETs.

Comparison: nominal interest vs CET

Rule of thumb: when you receive two or more offers for the same amount and term, always compare the CET — not the interest rate. And compare equivalent transactions: the CET of a personal loan is not directly comparable to that of a mortgage, for example.

Where to check the CET before signing

The financial institution is required to disclose the CET:

1. Before the contract is signed, along with the transaction's calculation spreadsheet;
2. At any time, upon customer request, even after the contract is signed;
3. In the contract itself;
4. In advertising materials for specific credit offers.

In practice, this means you can (and should) ask for the CET in writing for every offer you receive. If the institution refuses to disclose it, that is a red flag — and grounds for a complaint.

What to do if there is a problem

If the CET is not disclosed, differs from the contract, or you suspect improper charges:

1. First contact the bank's own customer service;
2. If unresolved, escalate to the institution's ombudsman;
3. File a complaint on the consumidor.gov.br platform;
4. You can also contact the Central Bank to report violations of rules of the Brazilian National Financial System.

Keep the offer, the calculation spreadsheet and the contract: these are what support your complaint. This practice connects with the routine of reviewing your bank statement step by step, which helps identify charges that don't match the contract.

CET in practice: a comparison roadmap

Before closing any credit deal, follow this sequence:

1. Define the amount and term of the transaction — only compare offers with the same terms;
2. Ask for the CET in writing from each institution;
3. Also ask for the calculation spreadsheet, which details each cost component;
4. Compare the CETs, not the interest rates;
5. Check fees and insurance that may be negotiable or dispensable;
6. Confirm the installment amount and the total paid by the end of the contract;
7. Only then sign.

This care is part of a larger plan: before taking on a new installment, it's worth reviewing your household budget and confirming the commitment fits your month-to-month finances. If the debt already exists and is growing, the guide on how to get out of debt on a low income can help you reorganize priorities.

Risks and limitations

• The CET is annual: in short-term transactions, it can look high because fixed fees are diluted over few months;
• Conditions change: the CET reflects the calculation date; if the offer changes, ask for an updated CET;
• CET is not the only criterion: liquidity, flexibility for early payoff and collateral also matter;
• CET is not an investment return: it measures the cost of debt, not earnings — don't confuse it with the yield logic of products like CDB, Tesouro Selic or savings accounts.

Common mistakes

1. Comparing only the interest rate — the most frequent and most expensive mistake;
2. Comparing offers with different amounts or terms — the CET is only comparable between equivalent transactions;
3. Ignoring embedded fees and insurance — they are in the CET, but it's worth understanding what they are;
4. Not asking for the calculation spreadsheet — you are entitled to it before signing;
5. Signing under time pressure — a "today only" offer does not exempt anyone from comparing CETs;
6. Forgetting the budget impact — the best CET in the world is useless if the installment doesn't fit your plan, something the weekly financial routine helps you monitor.

FAQ

Is the CET the same as the interest rate? No. The CET includes the interest rate and adds fees, taxes, insurance and other expenses of the transaction. That's why, when all these costs are non-negative — the standard case — the CET is equal to or greater than the interest rate.

Is the CET mandatory for every credit transaction? Yes. Financial institutions and leasing companies must disclose the CET before the contract is signed, provide the calculation spreadsheet, and include it in the contract and in advertising for specific offers.

Can I ask for the CET after signing? Yes. The institution must disclose the CET at any time, upon customer request.

Does a low CET always mean the best loan? Among offers with the same amount, term and modality, the lowest CET indicates the lowest total cost. But also evaluate payoff flexibility, required collateral and the installment's impact on your budget.

Does the CET apply to credit cards? The CET applies to credit transactions. On credit card revolving balances and installment plans, costs may be expressed in different ways; if in doubt, ask the institution for a formal explanation and the calculation spreadsheet.

Conclusion

The Total Effective Cost is the number that reveals what a loan or financing really costs. Low interest with high fees can cost more than slightly higher interest with no fees — and only the CET shows that difference. Before taking on any credit: ask for the CET and the calculation spreadsheet, compare equivalent offers, and confirm the installment fits your budget. Well-compared credit is cheaper credit — and less risk of runaway debt.