Maestro v. CIR: The BIR's Power to Accredit Tax Agents Survives an Equal Protection Challenge

In Emelino T. Maestro v. Commissioner of Internal Revenue (CTA Case No. 11309, Resolution promulgated February 6, 2026), the Court of Tax Appeals Special First Division denied a certified public accountant’s motion for reconsideration and upheld the constitutionality of the BIR’s accreditation requirement for tax agents under Section 6(G) of the National Internal Revenue Code (NIRC) and Revenue Regulations (RR) No. 11-2006, as amended by RR No. 04-2010. The Court held that requiring CPAs to separately register with the BIR before representing taxpayers does not violate equal protection or operate as an unconstitutional second professional license. This post is part of the Day in Court series.

Case details #

What happened #

Emelino T. Maestro, a certified public accountant (CPA), petitioned the CTA challenging the validity of Sections 3(B)(a), 4(A)(1), 8, and 13 of Revenue Regulations No. 11-2006, as amended by RR No. 04-2010 — the BIR’s consolidated regulations requiring individuals and firms who prepare and file tax returns or otherwise represent taxpayers before the BIR to first obtain accreditation as a “tax agent” from the BIR’s Revenue Region or National Accreditation Boards. RR No. 11-2006 was issued by then-Secretary of Finance Margarito B. Teves on the recommendation of then-Commissioner of Internal Revenue Jose Mario C. Buñag.

In its Decision dated August 6, 2025, the CTA denied Maestro’s petition for lack of merit. Maestro’s counsel filed a timely Motion for Reconsideration (mailed via an accredited courier on August 29, 2025), arguing among other points that: the BIR’s accreditation requirement is redundant given that CPAs already meet Professional Regulation Commission (PRC) licensure standards; it applies indiscriminately to all CPAs acting as tax agents without the narrower tailoring the Supreme Court required of a comparable SEC accreditation scheme in Securities and Exchange Commission v. 1Accountants Party-List, Inc. (G.R. No. 246027, January 28, 2025); and it functions as an unlawful second professional license, similar to the accreditation struck down in Airlift Asia Customs Brokerage, Inc. v. Court of Appeals (G.R. No. 183664, July 28, 2014).

The Commissioner of Internal Revenue countered that Section 6(G) of the NIRC expressly grants the Commissioner authority to accredit and register tax agents, distinct from and not intrusive upon the PRC’s general regulation of the accountancy profession, and that this authority safeguards the integrity of tax administration — consistent with the Supreme Court’s reasoning in the 2025 1Accountants case.

The issue before the court #

Whether the BIR’s accreditation requirement for tax agents under Section 6(G) of the NIRC and RR No. 11-2006, as amended, is unconstitutional as: (1) a violation of the equal protection clause for applying to all CPAs acting as tax agents without the narrower classification the Supreme Court required in SEC v. 1Accountants; and (2) an unlawful de facto second professional license on top of PRC/CPA licensure.

The ruling #

The CTA Special First Division denied Maestro’s Motion for Reconsideration and affirmed the validity of the BIR’s tax agent accreditation scheme.

Section 6(G) of the NIRC is an express statutory grant #

The Court distinguished Airlift, where the Bureau of Customs had imposed an accreditation scheme with no clear statutory basis. Here, Section 6(G) of the NIRC of 1997 expressly authorizes the Commissioner to “accredit and register, based on their professional competence, integrity and moral fitness, individuals and general professional partnerships and their representatives who prepare and file tax returns, statements, reports, protests, and other papers with, or who appear before, the Bureau for taxpayers.” Because this delegation is explicit, the Court held Airlift’s reasoning about agencies “legislating” accreditation schemes without legislative backing does not apply.

The equal protection challenge fails the standard four-part test #

Applying the settled test — that a classification (1) rests on substantial distinctions, (2) is germane to the law’s purpose, (3) is not limited to existing conditions, and (4) applies equally to all members of the same class — the Court held the accreditation requirement draws a valid line between CPAs (and others) who act as tax agents representing taxpayers before the BIR, and those whose work is confined to internal accounting functions that never involve appearing before the Bureau. That distinction, the Court reasoned, is substantial and germane to safeguarding tax administration, applies prospectively to all present and future tax agents, and applies uniformly to everyone who falls within the statutory definition — so the breadth of the class does not, by itself, make the classification unreasonable.

SEC v. 1Accountants supports the BIR, not the petitioner #

The Court read the Supreme Court’s January 2025 1Accountants ruling — which upheld the SEC’s authority to accredit external auditors of SEC-covered entities — as recognizing a broader “State policy of allowing various regulators to accredit external auditors” across sectors, expressly citing the NIRC’s tax agent accreditation as one example of that policy. The Court held that “accreditation that screens and disciplines professionals in a revenue-critical function cannot be trivialized as mere bureaucratic convenience,” and that regulating the specific activity of tax representation does not amount to regulating the CPA profession itself — a CPA remains free to practice bookkeeping, internal accounting, audit outside BIR representation, or academic and advisory work without BIR accreditation.

Redundancy alone is not a constitutional defect #

The Court rejected the argument that PRC licensure already covers the same ground, holding that redundancy is not, by itself, a ground to invalidate a regulation, and that Congress may validly prescribe context-specific safeguards — such as the “professional competence, integrity, and moral fitness” standard in Section 6(G) — where a profession intersects with a sensitive regulatory field like tax administration. There is no separate or dissenting opinion recorded in this Resolution; both participating justices concurred.

Our insights #

An analogy the Court leaned on heavily — and one that is itself well-corroborated #

The Resolution’s reasoning rests substantially on SEC v. 1Accountants Party-List, Inc., a case that has drawn its own contemporaneous coverage: the Supreme Court’s January 2025 decision upheld the SEC’s power to accredit CPAs as external auditors, and by mid-December 2025 the SEC was publicly welcoming a further Supreme Court resolution finally affirming that authority against a motion for reconsideration, as reported by BusinessWorld and Philstar. The CTA’s reliance on that precedent tracks a live, still-recent line of Supreme Court jurisprudence upholding sector-specific accreditation regimes for CPAs generally — not just in the tax context.

Thin, but honestly so — this is a fresh ruling #

Because this Resolution was promulgated in February 2026, it had not yet attracted independent law firm or audit firm commentary as of this post. Readers should treat the “insights” here as grounded directly in the Resolution’s own citations to the NIRC, RR No. 11-2006, and the 1Accountants and Airlift precedents it distinguishes, rather than in third-party analysis — which may emerge as the case, and any further appeal, proceeds.

A reminder that BIR accreditation is a function of role, not CPA status #

The Court’s framing — that accreditation “attaches to the function, i.e., tax representation before the BIR, not to the mere status of being a CPA” — is a useful distinction for any accounting professional deciding whether their engagement requires BIR accreditation under RR No. 11-2006 in the first place.

What this means for taxpayers #

Taxpayers who engage a CPA or other representative to prepare and file returns, respond to assessments, or otherwise appear before the BIR should confirm that representative holds current BIR accreditation as a tax agent under RR No. 11-2006, as amended — this Resolution reaffirms that the requirement is valid and enforceable, separate from a representative’s general PRC/CPA license. For accounting professionals, the ruling confirms that accreditation is tied to the specific activity of representing taxpayers before the BIR, not to holding a CPA license generally — bookkeeping, internal financial statement work, and non-representational advisory work do not themselves trigger the requirement.

Summary #

Maestro v. CIR is a constitutional-law-flavored CTA ruling with practical stakes for anyone relying on a tax agent: the Court upheld the BIR’s authority under Section 6(G) of the NIRC and RR No. 11-2006 to require separate accreditation of tax agents, rejecting equal protection and “second license” challenges by leaning on the Supreme Court’s 2025 SEC v. 1Accountants precedent. For related questions about who may properly represent a taxpayer before the BIR and how notice to a representative must be handled, see Mannasoft Technology v. CIR elsewhere in this series.

Sources #

Primary sources

• Court of Tax Appeals — Notice of Resolution and Resolution, CTA Case No. 11309, Emelino T. Maestro v. Commissioner of Internal Revenue, promulgated February 6, 2026

Secondary sources

• BusinessWorld Online — SEC authority over auditors affirmed (coverage of the related SEC v. 1Accountants Party-List, Inc. precedent the Resolution relies on)
• Philstar.com — SEC welcomes SC resolution on CPA accreditation (coverage of the same related precedent)