Mastering Tax Assessments: The Timeliness and Validity of Protests in the Philippines

---

The Supreme Court has firmly settled a recurring issue in Philippine tax administration: when the Bureau of Internal Revenue (BIR) reassigns a revenue officer mid-audit, it must issue a new or amended Letter of Authority (LOA) naming the replacement officer. In Commissioner of Internal Revenue v. McDonald's Philippines Realty Corp. (G.R. No. 242670, May 10, 2021), the Court invalidated a ₱16.2 million deficiency VAT assessment because the audit was continued by an officer not named in the LOA. This ruling is a critical reminder for taxpayers about the procedural requirements that make a tax assessment valid.

The Facts of the Case

In August 2007, the BIR's Large Taxpayers Service issued LOA No. 00006717 to four named revenue officers, authorizing them to examine McDonald's Philippines Realty Corporation's books for calendar year 2006. The audit covered all internal revenue taxes for that period.

In December 2008, the BIR transferred one of the original officers and, through a referral memorandum, designated a new officer, Rona Marcellano, to continue the audit. Crucially, no new or amended LOA was issued in Marcellano's name. The referral memorandum merely stated she would continue the pending audit under the original LOA.

In January 2011, the BIR issued a Formal Letter of Demand for deficiency income tax and VAT totaling over ₱17.4 million. After the taxpayer protested, the BIR issued a Final Decision on Disputed Assessment in April 2013, maintaining the deficiency VAT of ₱16,229,506.83. The taxpayer appealed to the Court of Tax Appeals (CTA), which voided the assessment because Marcellano lacked proper authorization.

The Legal Framework: The LOA Requirement

The National Internal Revenue Code (NIRC) is clear on this point. (A) empowers the Commissioner of Internal Revenue or a duly authorized representative to authorize the examination of any taxpayer. (c) allows Revenue Regional Directors to issue LOAs within their regions. states that a revenue officer may examine taxpayers only pursuant to an LOA issued by the Revenue Regional Director.

An LOA is not a mere formality. It is the concrete manifestation of the Commissioner's grant of authority to a specific revenue officer. The Court emphasized that this grant is bestowed upon an agent of the BIR—the named revenue officer—not upon the taxpayer. Therefore, the argument that "any" revenue officer may act under a validly issued LOA is mistaken.

Due Process and the Taxpayer's Right to Know

The Court anchored its ruling on due process. A taxpayer has the right to verify that the officer conducting an audit has proper authority. The only way to make this verification is by reading the LOA and seeing the names of the authorized officers. If any officer other than those named conducts the examination, the taxpayer cannot confirm the officer's authority.

The Court rejected the BIR's position that a referral memorandum or memorandum of assignment could substitute for an LOA. These internal documents serve a different purpose—they handle case reassignments and transfers. They are issued by revenue district officers or subordinate officials, not by the Commissioner or his duly authorized representatives. Using them to vest audit authority effectively usurps the Commissioner's statutory power.

The Applicable BIR Rules

The Court also addressed BIR's claim that Revenue Memorandum Order (RMO) No. 43-90, issued in 1990, was no longer effective. The Court disagreed. (5) of expressly requires the issuance of a new LOA when cases are reassigned or transferred to another revenue officer. While the RMO predates the NIRC, of the NIRC repeals only rules contrary to or inconsistent with the Code. Since is consistent with Sections 6(A), 10, and 13, it remains effective and applicable.

Notably, the BIR's own Operations Group recognized this principle. In Operations Memorandum No. 2018-02-03, issued in February 2018, the BIR discontinued the practice of issuing memoranda of assignment for case reassignments in instances of officer transfer, resignation, or retirement.

The Ruling and Its Implications

Applying these principles, the Court found that Marcellano was not authorized to continue the audit. The original LOA named four specific officers. When one was transferred, only a referral memorandum was issued—no new or amended LOA. The assessment based on this unauthorized audit was therefore void.

The Court's ruling establishes three key principles: (1) substituting revenue officers without a new or amended LOA violates the taxpayer's right to due process; (2) such practice usurps the Commissioner's statutory power to grant audit authority; and (3) it violates existing BIR rules and regulations.

Practical Takeaways

• Verify the LOA before allowing an audit. Taxpayers should check that the officers conducting an examination are the same ones named in the LOA presented.
• Question unauthorized substitutions. If a new officer appears without a new or amended LOA, the taxpayer may challenge the audit's validity.
• Act promptly on assessments. The taxpayer in this case filed a timely protest within the statutory period, which preserved its right to challenge the assessment in court.
• Document everything. Keep copies of all LOAs, referral memoranda, and correspondence with the BIR to support a due process claim.
• Know that internal BIR documents are not substitutes for an LOA. Referral memoranda and assignment orders handle administrative matters; they do not grant audit authority.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.