Auto de Infração (Tax Assessment Notice): How to File an Administrative Challenge and Appeal

This page is a translation of the original Portuguese text, provided for convenience. It deals with Brazilian law. If there is any discrepancy, the Portuguese version prevails. Read the original in Portuguese

The auto de infração (tax assessment notice) is the document the tax authorities use to formalize a tax demand, but issuing it does not end the debate. Knowing the available defenses, the deadlines, and the right strategy is what separates the taxpayer who pays an amount not actually owed from the one who overturns the assessment.

What an auto de infração is and when it is issued

The auto de infração is the administrative act by which the tax authority establishes the tax credit. It describes the conduct considered irregular, cites the rule allegedly violated, and quantifies the tax owed, the applicable penalty, default interest, and other accessory charges. It is the main instrument of the ex officio assessment (an assessment the tax authority issues on its own initiative) provided for in Article 142 of the National Tax Code, and it marks the formal start of the administrative tax dispute.

As a rule, an auto de infração is issued when the tax authorities identify unreported revenue, failure to pay a tax that was declared, a mismatch between the information the taxpayer provided and data cross-checked by tax administrations, disallowed expenses in audited transactions, or failure to comply with ancillary obligations. Each level of government (federal, state, municipal) has its own rules, but the defense logic is strikingly similar across them.

Once you receive the notice, you have a fixed period to respond. If you do nothing, the credit becomes final, is entered in the active debt registry, and is enforced through a tax enforcement action. A timely response, on the other hand, suspends the enforceability of the debt while the administrative proceeding is pending, under Article 151, item III, of the National Tax Code.

Administrative challenge: the first line of defense

The administrative challenge (impugnação) is the opening filing in the administrative defense. At the federal level, governed by Decree 70.235/1972, the deadline is thirty days from the date you are notified of the assessment. At the state and municipal levels, deadlines depend on local legislation. Thirty days is common there too, although some jurisdictions use different periods. The first step, therefore, is to check the specific rules of the authority that issued the notice.

The filing must be addressed to the first-instance decision-making authority (the Federal Revenue Judgment Office, at the federal level; the Administrative Council or Board in states and municipalities). In it, the taxpayer sets out the facts, refutes the grounds of the assessment, identifies the evidence they intend to present, and asks for the demand to be canceled in whole or in part.

Great care in defining the issues is warranted because of the rule of preclusion (preclusão consumativa). Arguments not raised in the challenge are, as a rule, barred in the higher instances, except for matters of public order such as the lapse of the right to assess (decadência), the statute of limitations (prescrição), and absolute nullities. That is why it is important to map out every relevant argument from the very beginning: formal defects in the notice, errors in calculating the tax base, expiration of the authority’s right to assess, lack of a legally defined violation, a mistaken legal characterization of the facts, and others.

Once you receive the notice, you have a fixed period to respond.

How to structure an effective challenge

A well-constructed challenge follows a three-part structure: a statement of facts, legal grounds, and requests. The statement of facts describes the audited transaction, the content of the assessment, and the timeline of events. The legal grounds lay out the defense arguments, supported by legislation, administrative case law (notably from CARF (Brazil’s Administrative Council of Tax Appeals), at the federal level), and established legal scholarship. The requests ask for the notice to be canceled, for the production of evidence and, where appropriate, for further inquiries to be carried out.

Documentary evidence should accompany the filing. Invoices, contracts, accounting records, accounting expert reports, proof of payment, and calculation statements must be included from the start. Submitting evidence late, although possible in exceptional situations, usually meets resistance. When the dispute involves a complex technical issue, requesting an accounting expert examination or a tax inquiry can be decisive for a favorable outcome.

Several sensitive points deserve extra attention: the heading with the challenger’s full identification, the exact number of the administrative case, the reference to the auto de infração being contested, and the signature of an attorney holding a valid power of attorney. Formal defects, although often curable, slow the case down and cause rework.

Voluntary appeal and higher instances

If the challenge is rejected, the deadline to file a voluntary appeal begins to run. In federal disputes, the deadline is also thirty days, and the case is decided by a collegiate second-instance body, the Administrative Council of Tax Appeals (CARF). At the state and municipal levels, the appeal goes to their own administrative tribunals, which have varying names (Tax and Fees Court, Taxpayers’ Council, Tax Appeals Board).

As a rule, a voluntary appeal cannot introduce new issues, but it allows you to develop the arguments already made, add case law issued since the challenge, and contest the reasoning of the first-instance decision. It is also the right time to raise procedural nullities that tainted the initial decision.

If the assessment is upheld in the second instance, the remaining options, depending on the case, are special appeals to the highest administrative body (at the federal level, the Superior Chamber of Tax Appeals) and, once the administrative route is exhausted, a court challenge. Choosing between continuing in the administrative arena or moving to the courts is a strategic decision. It depends on the issue in dispute, the prevailing case law, and the cost-benefit balance for the taxpayer.

Common mistakes that undermine your defense

Among the most frequent mistakes is missing the deadline. Once you are notified of the auto de infração, even if you receive it by mail or through the Electronic Tax Domicile, the period to file a challenge starts running. Neglecting to monitor tax communications is a common cause of default and of the credit becoming final as a result.

Another common error is a generic defense built on abstract formulas that never address the concrete points of the assessment. A challenge that merely invokes constitutional principles without showing, with technical precision, how the notice violated them has little chance of success. A persuasive defense must be anchored in the facts, the accounting records, the numbers, and the applicable law.

Just as damaging is ignoring the arguments that prevail in administrative case law. CARF, the state tribunals, and the municipal councils have established positions that, when properly invoked, greatly strengthen a defense. Overlooking them means giving up arguments that administrative practice has already validated.

Finally, there is the mistake of not raising a possible lapse of the right to assess or statute of limitations from the challenge stage. The lapse of the right to assess, provided for in Article 150, paragraph 4, and Article 173 of the National Tax Code, voids assessments made after the legal period has expired. Leaving out this argument, although in theory it can still be raised later because it is a matter of public order, creates uncertainty that a timely assertion would have avoided.

Frequently Asked Questions

What is the deadline to file a challenge against a federal auto de infração?

The deadline is thirty days from the date you are notified of the assessment, under Decree 70.235/1972. The count follows the rule in Article 5 of the same decree: the day the period starts is excluded and the last day is included, with an extension to the next business day if the deadline falls on a Saturday, Sunday, or holiday. At the state and municipal levels, the deadline is set by the legislation of the authority that issued the notice, and it is advisable to check it right after you are notified.

When is it worth filing a challenge instead of paying the auto de infração?

Whenever there is a legal or factual basis to contest the assessment. Paying in full up front usually earns a discount on the penalty, but it means acknowledging the debt and giving up the right to dispute it. A technical review of the notice, before any decision is made, identifies formal defects, calculation errors, prevailing case law, and the real likelihood of success. That lets you make an informed choice among defending yourself, paying at a discount, or joining an installment program.

Can any taxpayer file a voluntary appeal?

Yes, as long as the challenge was rejected in the first instance, in whole or in part. The appeal goes to the competent second-instance body (at the federal level, CARF) and must be filed within the legal deadline, which is also thirty days at the federal level. No appeal deposit or security is required for the appeal to be heard, although a later court challenge may, in some situations, require security for the enforcement proceeding.

As informações deste artigo são de caráter informativo e não substituem consulta jurídica individualizada. Cada caso possui particularidades que exigem análise específica.