Banking Law · MOFU

Contract review lawsuit: when it applies, how it works and what makes up the cost

By Dr. Wendel Ferreira Lopes, OAB/MG 18.881 · Published on July 20, 2026

Capa do artigo sobre ação revisional de contrato bancário e como ela pode corrigir encargos abusivos no financiamento — WF Advogados.

Contract review lawsuit: when it applies, how it works and what makes up the cost

Quick answer: the ação revisional (contract review lawsuit) is the court proceeding that seeks the correction of clauses in a bank contract and the recalculation of the outstanding balance. It applies when there is a charge billed without contractual basis, a rate far above the market average measured by the Central Bank, or a fee charged for a service that was never provided. The cost is made up of court costs, accounting expert examination and the risk of sucumbência (the losing party's liability for the opposing side's attorney fees and expenses).

An industrial company in the Triângulo Mineiro region renegotiated the same working capital facility three times in eighteen months. With each rollover, the outstanding balance came back higher than the amount originally borrowed, even with payments up to date. When the controller finally opened the amortization spreadsheet next to the signed contract, what usually shows up in these cases showed up: charges nobody could explain, a fee billed for a service that never arrived, and an effective rate quite far from the one that had been negotiated at the table.

Situations like this rarely turn into a lawsuit on impulse. They turn into a lawsuit when the banking liability starts to compromise the operation's cash flow and the company realizes it is financing a calculation error, not a cost of credit. That is where the contract review lawsuit comes in.

This text explains what the review lawsuit actually disputes, what case law has already settled (including against the debtor) and which elements make up the cost of pursuing it.

What the contract review lawsuit is

The contract review lawsuit is the claim in which the contracting party asks the Judiciary to review clauses of the bank contract and to order the recalculation of the debt. It is not a request for debt forgiveness, nor for annulment of the contract. It is a request for rebalancing: the contract remains standing, with the charges adjusted to what the law and case law allow.

The legal basis varies according to the contracting party's profile. In consumer relations, article 6, item V, of the Consumer Protection Code (Código de Defesa do Consumidor — CDC) guarantees the modification of clauses establishing disproportionate obligations and review on the grounds of supervening facts that make them excessively burdensome. Súmula 297 (a consolidated statement of settled case law) of the Superior Court of Justice (Superior Tribunal de Justiça — STJ) established that the CDC applies to financial institutions. In business-to-business contracts, where a consumer relation is not always present, the path runs through the Civil Code: article 317 allows the judge to correct the obligation when unforeseeable reasons create a manifest disproportion between the amount owed and its value at the time of performance, and articles 478 et seq. address excessive burden in contracts of continued or deferred performance.

In the firm's practice, the contracts that most often come in for analysis are not retail consumer credit. They are cédulas de crédito bancário (Brazilian bank credit notes) for working capital, fleet and machinery financing, receivables discounting and high-value transactions secured by collateral, in which one percentage point miscalculated translates into hundreds of thousands of reais over the term.

When the review lawsuit applies, and when it does not

Much of the frustration with review lawsuits comes from poorly calibrated expectations. The STJ has settled several points over the years, and some of them close doors that are still being sold out there as if they were open. Knowing this boundary before filing is what separates a sustainable legal theory from a pointless drain.

TheoryStatus in case law
Interest above 12% per year is abusive in itselfRejected. STJ Súmula 382 states that a rate above 12% per year, on its own, does not indicate abusiveness
Interest far above the market average rate for the transaction typeSustainable. Abusiveness must be demonstrated case by case, taking the average measured by the Central Bank as the reference
Compounding of interest at intervals shorter than annualAllowed in contracts entered into on or after March 31, 2000, provided it is expressly agreed (STJ Súmula 539)
Compounding without express provision in the instrumentSustainable. It lacks the express-agreement requirement demanded by Súmula 539
Asset appraisal fee and reimbursement of registration costsIt depends. STJ Theme 958 conditions validity on the service having actually been provided and allows scrutiny of excessive burden in the specific case
Insurance imposed by the institution, with no freedom of choiceSustainable, when the contracting party could choose neither whether to take out the policy nor the insurer
Judge finding abusiveness without the party requesting itProhibited. STJ Súmula 381 bars review on the court's own initiative (de ofício) in bank contracts
Disputing a contract already renegotiated or acknowledgedPossible. STJ Súmula 286 states that renegotiation or acknowledgment of debt does not prevent the discussion of illegalities in prior contracts

Súmula 381 deserves emphasis because it defines the logic of the entire proceeding. Since the judge cannot identify abusiveness on their own, each challenged charge must be pointed out, quantified and proven by the party requesting the review. A generic review lawsuit, one that asks for "review of all abusive clauses", tends to sink before the expert examination.

Súmula 286 is underestimated by those who have already rolled the debt over several times. Having signed an acknowledgment of debt does not erase what was improperly charged in the contracts that gave rise to it, and it is precisely in chains of successive renegotiation that the deviations accumulate.

How the contract review lawsuit works, step by step

1. Document gathering. The contractual instrument, the amendments, the statements of the linked account and the reports on the evolution of the outstanding balance are collected. When the bank does not hand over the complete documentation, a request for production of documents is appropriate, in or out of court, before or within the review lawsuit. 2. Preliminary calculation. Before filing, the amortization is redone contract by contract and the rate actually applied is compared with the average published by the Central Bank for that transaction type, in the month the contract was signed. It is this calculation that defines whether there is a legal theory and what economic benefit is at stake. 3. Initial petition with delimited requests. Each challenged charge is individualized, with the corresponding amount. The valor da causa (the officially stated value of the claim) follows the economic benefit sought, and that definition has a direct impact on court costs and on loss-of-suit liability. 4. Answer and reply. The financial institution defends the legality of the charges and usually invokes pacta sunt servanda and the favorable súmulas. The reply brings the discussion back to the level of the numbers. 5. Accounting expert examination. This is the decisive phase. The expert reconstructs the evolution of the debt, isolates each charge and determines the amount that remains after excluding whatever is recognized as improper. 6. Judgment and possible appeal. Once abusiveness is recognized, the balance is recalculated, with refund of what was overpaid or offset against the remaining balance itself.

Step 2 is the one most often skipped and the one that is most costly to skip. Without a preliminary calculation, there is no way to know whether the economic benefit justifies the lawsuit, and no way to know what value to assign to the claim.

What makes up the cost of a contract review lawsuit

The question "how much does a contract review lawsuit cost" almost never has a useful answer as a closed number, because the cost is not an off-the-shelf price: it is the sum of procedural expenses that vary by court, by complexity and by the amount in dispute. It is worth understanding each component.

ComponentHow it behaves
Initial court costs and judicial feeCalculated as a percentage of the valor da causa, under each court's costs statute, with their own floors and caps
Expert feesAdvanced by the party that requested the expert examination, or shared when it is ordered on the court's own initiative or requested by both parties (article 95 of the Code of Civil Procedure)
Diligence and documentation expensesCertificates, copies, possible production of documents and a party-appointed technical assistant, when the complexity warrants it
Loss-of-suit liability (sucumbência)If the claim is dismissed, the party bears attorney fees set between 10% and 20% of the amount of the award, of the economic benefit or of the updated valor da causa (article 85, §2, of the CPC)
Appellate costsFiling fee for the appeal, when an appeal is brought

Four factors move this calculation up or down. The first is the valor da causa, which pulls court costs and loss-of-suit liability proportionally. The second is the number of chained contracts: reviewing a single credit note is one thing, reconstructing a chain of six renegotiations is another, and the expert examination grows along with it. The third is the quality of the available documentation, because every gap turns into a procedural incident. The fourth is the type of contract, since structured transactions with collateral and adjustment clauses require denser expert work than a standardized financing.

The component that tends to be ignored is the fourth in the table. Loss-of-suit liability turns a poorly grounded review lawsuit into a loss, not into neutrality. That is why the preliminary calculation is not a formality: it is what simultaneously sizes the chance of success and the exposure in case of defeat.

The review lawsuit as a liability management tool

Seen up close, a well-conducted review lawsuit is not a resource for someone trying to escape a debt. It is a liability management tool. The company that discovers it is paying an improper charge on one working capital transaction normally discovers the same pattern in the other credit lines from the same bank, because the deviation is usually in the contract template, not in an isolated typing error.

The practical effect of a well-executed recalculation shows up on three fronts. The outstanding balance falls to the contractually correct level. The capacity to take on new credit improves, because the reported indebtedness is no longer inflated. And the negotiation with the institution itself changes in tone, since the conversation now takes place with audited numbers on both sides.

That is the banking contract review work of WF Advogados: identifying the disputable points, quantifying the benefit and choosing the route, judicial or negotiated, that makes sense for that liability. To first understand what characterizes an excessive charge, the text on abusive interest details the criteria for comparison with the market average, and the one on financing review deals specifically with transactions involving an asset given as collateral.


Informative content; it does not replace individual legal advice. Each case has particularities that require specific analysis.

Dr. Wendel Ferreira Lopes — Attorney, OAB/MG nº 18.881. Founding partner of WF Advogados, practicing in Tax, Banking and Estate/Succession Law since 1999. Uberlândia/MG.

Frequently Asked Questions

What is a contract review lawsuit?

It is the court action in which a party requests the review of contract clauses and the recalculation of the outstanding balance. The contract remains valid, with the charges adjusted to what the law and case law allow.

How much does a contract review lawsuit cost?

There is no single figure. The cost is made up of court costs calculated on the valor da causa, expert fees advanced under article 95 of the CPC, documentation expenses and the risk of loss-of-suit liability if the claim is dismissed. Each court has its own costs statute.

Is interest above 12% per year abusive?

Not in itself. STJ Súmula 382 states that setting remuneratory interest above 12% per year, on its own, does not indicate abusiveness. The discussion takes place through comparison with the market average rate for the transaction type, measured by the Central Bank.

Can I review a contract I have already renegotiated?

Yes. STJ Súmula 286 establishes that renegotiation or acknowledgment of debt does not prevent the discussion of any illegalities in prior contracts.

Does the contract review lawsuit suspend payment of the installments?

Not automatically. Suspension or deposit of the undisputed amount depends on a specific court decision in the individual case, and the request must be supported by the calculation of what is understood to be owed.

Do I need an accounting expert examination in the review lawsuit?

In most cases, yes. It is the expert examination that reconstructs the evolution of the debt and isolates each challenged charge. Since the judge cannot recognize abusiveness on their own initiative (STJ Súmula 381), the technical evidence is usually decisive.

Can a company also file a review lawsuit?

It can. When a consumer relation is not present, the legal basis shifts to the Civil Code, on the grounds of the manifest disproportion of article 317 and the excessive burden of articles 478 et seq., in addition to the discussion about charges that were not agreed upon.

How long does a contract review lawsuit take?

It depends on the court, on the complexity of the expert examination and on the number of contracts involved. Proceedings with a long chain of renegotiations and dense expert evidence usually take longer than review lawsuits over a single contract.