From LOA to Criminal Case: How a Tax Audit Can Escalate Into Prosecution

Executive Summary

Receiving a BIR Letter of Authority (LOA) does not mean that a taxpayer is already facing a criminal case.

Most tax audits remain administrative proceedings focused on determining whether the correct taxes were reported and paid. But an audit can become more serious when the BIR finds possible fraud, intentional underdeclaration, willful failure to file or pay taxes, falsified records, or refusal to comply with lawful summons.

Under the BIR’s 2026 audit framework, full examinations are generally conducted through an electronic Letter of Authority (eLA). Audits and verifications must be supported by a valid eLA, Tax Verification Notice, or Mission Order, and must stay within the authorized tax types and taxable periods.

A key point for taxpayers is that a criminal tax case does not always have to wait until the entire assessment process is finished. Philippine Supreme Court jurisprudence recognizes that, particularly in cases involving fraudulent returns or failure to file returns, criminal proceedings may be initiated even without a prior final deficiency tax assessment.

This is why businesses should treat a BIR audit seriously from the beginning. Good documentation, timely responses, and careful legal review can prevent an ordinary audit issue from becoming a much larger tax controversy.

How Does a BIR Audit Normally Begin?

A full BIR tax audit generally begins with an eLA, commonly still referred to as a Letter of Authority or LOA.

The document identifies the taxpayer, the taxable period, the taxes covered, and the Revenue Officers authorized to conduct the examination.

Under RMO No. 22-2026, taxpayers are generally subject to only one eLA for a given taxable year covering the applicable internal revenue taxes, subject to recognized exceptions and rules on replacement or consolidation.

At this stage, the case is normally administrative.

The BIR is examining the taxpayer’s returns, books, invoices, withholding records, financial statements, and supporting documents to determine whether additional taxes may be due.

The audit becomes more sensitive when the evidence begins suggesting willful or fraudulent conduct rather than an ordinary reporting error.

Step-by-Step: How Can an Audit Escalate Into a Criminal Tax Case?

Step 1: The BIR Identifies a Tax Risk or Discrepancy

The BIR’s current audit program is increasingly risk-based and data-driven.

RMO No. 22-2026 identifies circumstances that may trigger or prioritize an audit, including significant discrepancies, third-party information, unusually low tax payments, substantial losses despite significant sales, and other indicators detected through BIR systems.

Particularly serious cases include taxpayers with alleged underdeclaration of sales or income or overstatement of expenses or deductions by at least 30%, which the Order identifies as a possible prima facie fraud indicator for audit-selection purposes.

That does not mean a 30% discrepancy automatically proves criminal tax evasion.

It may justify further investigation. Criminal liability still requires the government to prove the elements of the particular offense under the applicable standard of proof.

Step 2: The Revenue Officer Requests Records

The BIR ordinarily serves the eLA together with its standardized checklist of required documents.

Under RMO No. 22-2026, failure to provide the required records within 10 calendar days may lead to a First Notice for Presentation or Submission of Documents.

If the taxpayer still fails to comply within another 10 calendar days from receipt of that notice, the BIR may issue a Second and Final Notice.

This stage should not be treated casually.

A taxpayer may have legitimate reasons why certain documents cannot immediately be produced. The proper response is usually to address the request formally, identify what is available, explain genuine deficiencies, and document all submissions.

Ignoring the requests can create a separate enforcement problem.

Step 3: Continued Non-Compliance Can Lead to a Subpoena

If the taxpayer continues to fail or refuse to submit the requested books and records, the Revenue Officer may recommend the issuance of a Subpoena Duces Tecum (SDT).

An SDT is no longer an ordinary request.

It is a compulsory legal process requiring the taxpayer or responsible person to produce specified records.

RMO No. 22-2026 expressly states that failure or refusal to comply with a valid SDT may warrant the initiation of criminal proceedings for failure to obey summons under Section 266 of the Tax Code.

This creates one of the clearest paths by which an administrative audit can develop into criminal exposure.

Step 4: The BIR Evaluates the Audit Findings

If documents are produced, the Revenue Officer examines the records and compares them with the tax returns and information available to the BIR.

Ordinary discrepancies may remain within the assessment process.

The taxpayer may receive a Notice of Discrepancy, participate in a Discussion of Discrepancy, and later receive a Preliminary Assessment Notice if the issues remain unresolved.

But evidence suggesting intentional conduct can change the nature of the case.

Possible criminal concerns may arise from allegations involving deliberately concealed sales, fictitious expenses, knowingly false returns, intentional non-filing, withholding taxes collected but not remitted, fabricated records, or other conduct that potentially falls within the penal provisions of the Tax Code.

The distinction is important:

A tax error is not automatically tax evasion.

Criminal tax offenses generally involve an additional element of willfulness or intentional wrongdoing.

Step 5: The Case May Proceed Through PAN and FLD/FAN

For the ordinary administrative assessment track, unresolved audit findings may lead to a Preliminary Assessment Notice (PAN).

Under RMO No. 22-2026 and existing assessment rules, a taxpayer generally has 15 days from receipt of the PAN to respond. The BIR may thereafter issue a Formal Letter of Demand and Final Assessment Notice (FLD/FAN) where warranted.

A taxpayer who disputes an FLD/FAN generally has 30 days from receipt to file the proper administrative protest.

These deadlines are critical for challenging the civil tax assessment.

But they should not be confused with the criminal process.

Step 6: Criminal Proceedings Do Not Always Have to Wait for a Final Assessment

This is one of the most important rules for taxpayers to understand.

The Supreme Court held in Commissioner of Internal Revenue v. Pascor Realty and Development Corporation that a criminal complaint for tax evasion is not itself a tax assessment and that an assessment is not invariably required before criminal charges may be initiated.

In cases involving false or fraudulent returns or failure to file a return, the government may pursue criminal proceedings without first completing the ordinary assessment process.

The earlier case of Ungab v. Cusi similarly rejected the argument that a pending protest against an assessment automatically prevents criminal tax prosecution. The criminal action and the administrative tax dispute may proceed on distinct legal tracks.

More recent Supreme Court jurisprudence has likewise reiterated that a prior deficiency assessment is not necessarily a prerequisite to criminal prosecution for tax violations.

This means a company should never assume:

“We have not received a final assessment yet, so there cannot be a criminal case.”

That assumption can be dangerous.

Step 7: The Case May Be Referred for Preliminary Investigation and Prosecution

Where the BIR concludes that the evidence may support a criminal violation, the matter may be referred to the appropriate legal or prosecution authorities.

The taxpayer or responsible corporate officers may then receive a subpoena or complaint requiring the filing of a counter-affidavit and supporting evidence during preliminary investigation.

At this point, the case has moved beyond an ordinary tax audit.

The question is no longer only whether additional tax is due.

The government is also examining whether there is probable cause to prosecute a criminal offense.

If probable cause is found, an Information may be filed before the proper court.

What Tax Violations Can Lead to Criminal Exposure?

Two frequently encountered provisions are Sections 254 and 255 of the National Internal Revenue Code, as amended.

Section 254 penalizes a willful attempt to evade or defeat tax or its payment. The provision carries substantial fines and imprisonment upon conviction, reflecting the seriousness with which intentional tax evasion is treated. The TRAIN Law significantly increased the penalties for this offense.

Section 255 covers several forms of willful non-compliance, including failure to file required returns, pay taxes, maintain required records, provide correct and accurate information, or withhold and remit taxes as required by law.

Corporations should also understand that criminal exposure does not necessarily remain solely with the corporate entity.

The Tax Code contains provisions addressing the liability of responsible corporate officers and employees, depending on their participation and responsibility for the violation.

Accordingly, presidents, treasurers, managers, officers-in-charge, and other responsible personnel should not assume that incorporation automatically shields them from prosecution for tax offenses.

Risks and Penalties When an Audit Becomes Criminal

The most obvious risk is criminal conviction, which may carry substantial fines and imprisonment, depending on the offense.

But there are other consequences.

A taxpayer may simultaneously face the underlying deficiency taxes, civil penalties, interest, collection proceedings, substantial litigation costs, and disruption to business operations.

For corporate officers, an investigation can also require extensive review of who signed returns, who controlled tax compliance, who authorized payments, and who had responsibility for withholding or remitting taxes.

Criminal proceedings also demand a different strategy from an ordinary PAN or FAN protest.

Statements made during the audit, documents submitted, affidavits executed, and explanations previously given may later become relevant evidence.

This is why significant fraud indicators or threats of criminal referral should generally be reviewed with counsel before the taxpayer makes unnecessary admissions or takes inconsistent positions.

Practical Example: How an Ordinary Audit Can Escalate

Suppose ABC Corporation receives an eLA covering its 2025 tax liabilities.

During the audit, the BIR identifies a substantial difference between sales appearing in third-party data and the sales declared in ABC’s tax returns.

ABC initially assumes the discrepancy is merely accounting-related and repeatedly postpones producing its supporting records.

The BIR issues formal document notices.

ABC still fails to respond.

An SDT is eventually issued.

At the same time, the BIR examination begins suggesting that certain sales may have been deliberately excluded from the company’s returns.

ABC now potentially faces two different problems.

First, the alleged undeclared sales may result in deficiency tax assessments.

Second, intentional concealment if supported by sufficient evidence may raise possible tax-evasion issues, while continued refusal to obey a valid SDT may create separate criminal exposure under the Tax Code.

Compare that with a taxpayer who responds immediately, reconciles the third-party data, demonstrates that part of the discrepancy consists of cancelled transactions or timing differences, and documents the explanation.

The outcome may be very different.

The point is not that cooperation eliminates legitimate tax liability.

It is that organized, legally reviewed compliance can prevent factual misunderstandings and avoid creating additional enforcement issues unnecessarily.

A Criminal Tax Case Is Not Simply a More Serious Assessment

One of the biggest misconceptions is that criminal prosecution is merely the “next step” after the FLD/FAN.

That is too simplistic.

The civil assessment process determines and collects tax liabilities.

The criminal process determines whether a person committed an offense punishable under the Tax Code.

The two may arise from the same underlying facts, but they have different legal purposes and different standards of proof.

The Supreme Court has explained that criminal tax liability requires proof beyond reasonable doubt, while the government’s civil claim for the taxes involves a separate evidentiary inquiry.

This distinction is why taxpayers should manage both tracks carefully when criminal exposure becomes possible.

Frequently Asked Questions

Does receiving an LOA mean the BIR will file a criminal case?

No.

An eLA or LOA generally authorizes a tax examination. Many audits end through payment, adjustment of findings, protest, or closure without criminal proceedings.

Criminal exposure usually depends on additional facts indicating a possible penal violation.

Can the BIR file a tax-evasion case before issuing a FAN?

Yes, in appropriate cases.

Supreme Court jurisprudence recognizes that a prior final tax assessment is not always required before criminal proceedings for tax violations may be instituted, particularly in cases involving fraudulent returns or failure to file.

Is a large tax deficiency automatically tax evasion?

No.

A large deficiency may trigger closer scrutiny, but criminal tax evasion generally requires proof of willful conduct.

A mistaken tax treatment, accounting error, or good-faith legal position should not automatically be equated with intentional evasion.

Can ignoring BIR document requests lead to a criminal case?

Potentially.

Under the current BIR audit framework, repeated non-compliance may lead to the issuance of an SDT. Failure to obey a valid summons can trigger criminal proceedings under Section 266 of the Tax Code.

Can a corporation’s officers be charged personally?

Yes, depending on the offense and the officer’s responsibility or participation.

The fact that the taxpayer is a corporation does not necessarily prevent prosecution of the responsible officers or employees identified under the Tax Code.

Should a taxpayer continue communicating directly with the Revenue Officer once criminal exposure becomes apparent?

The company should continue complying with lawful BIR requirements, but significant communications and submissions should be carefully reviewed.

Once possible criminal liability arises, the taxpayer should consider involving tax counsel immediately so that responses to the administrative audit remain consistent with the defense of any potential criminal case.

When a Tax Audit Starts Showing Criminal Risk, Strategy Matters

A BIR audit should not be treated as a criminal case from Day 1.

But neither should taxpayers assume that every audit will remain purely administrative.

The risk changes when the case begins involving alleged fraud, intentional underreporting, falsified records, repeated non-compliance, unremitted withholding taxes, or refusal to obey compulsory BIR processes.

At that stage, businesses need to manage more than the tax computation.

They must consider the evidentiary record, prior submissions, potential liability of responsible officers, administrative protest strategy, and possible criminal defense at the same time.

Aureada CPA Law Firm assists taxpayers and corporate officers in navigating BIR audits, deficiency assessments, administrative protests, tax investigations, and criminal tax proceedings. Our combined legal, accounting, and tax perspective allows us to examine not only the BIR’s legal theory, but also the underlying books, reconciliations, tax returns, and documentary evidence on which the case ultimately depends.

If your company has received an eLA or LOA, Subpoena Duces Tecum, PAN, FLD/FAN, DOJ subpoena, or criminal complaint involving alleged Tax Code violations, early legal review can be critical. The strongest time to develop a defensible position is often before an ordinary audit problem becomes a prosecution case.