CIR v. Unioil: No Proven PAN Means a Withholding Tax Assessment Is Void

In Commissioner of Internal Revenue v. Unioil Corporation (G.R. No. 204405, August 4, 2021), the Supreme Court Second Division denied the CIR’s petition and sustained cancellation of deficiency withholding tax on compensation (WTC) and expanded withholding tax (EWT) assessments totaling ₱536,801.10 for taxable year 2005. The Court held that the BIR failed to prove issuance and receipt of a Preliminary Assessment Notice (PAN) as required by Section 228 of the National Internal Revenue Code (NIRC) and Revenue Regulations (RR) No. 12-99 — and that belated annexes first attached to the Supreme Court petition could not cure that failure. The Court also treated the Formal Letter of Demand (FLD) / Final Assessment Notice (FAN) as void for lacking proper factual and legal bases and as issued beyond the three-year assessment period. This post is part of the Day in Court series.

Case details #

What happened #

Unioil Corporation is a domestic corporation. On January 26, 2009, it received an FLD and FAN assessing deficiency WTC of ₱451,834.31 and deficiency EWT of ₱84,966.79 for the year ended December 31, 2005 — ₱536,801.10 in total, inclusive of interest. Unioil protested the FAN on February 25, 2009, submitted supporting documents on April 24, 2009, and — after the 180-day period lapsed without a final BIR resolution — filed a Petition for Review with the CTA Third Division on November 20, 2009 (CTA Case No. 8000).

Among other defenses, Unioil argued it never received a PAN before the FAN, contrary to RR No. 12-99. The CIR’s trial evidence included a draft PAN and a PAN document that did not show personal delivery or mailing to Unioil. The CTA Third Division granted Unioil’s petition, cancelled the assessments, and held that failure to prove PAN issuance and receipt denied due process under Section 228 and RR No. 12-99. The CTA En Banc affirmed in toto. The CIR then petitioned the Supreme Court and, for the first time on that appeal, attached materials purporting to show a November 27, 2008 PAN and Unioil’s December 15, 2008 receipt / December 22, 2008 protest.

The issue before the court #

Whether the CTA erred in voiding Unioil’s deficiency WTC and EWT assessments for failure to prove that a PAN was issued and received — and whether the CIR could supply that proof for the first time before the Supreme Court. Related questions included prescription under Section 203 and whether the FLD/FAN stated the factual and legal bases required by Section 228.

The ruling #

The Supreme Court denied the petition. Cancellation of the January 14, 2009 Formal Letter of Demand and Assessment Notice No. F43-128 was sustained.

The PAN is mandatory due process — and the BIR must prove it #

Quoting the CTA En Banc’s framing, the Court treated the PAN as an integral part of procedural due process: it states the factual and legal basis of the proposed assessment and gives both sides a chance to settle before a FAN issues. When Unioil denied receipt, the burden shifted to the CIR to prove the contrary. Offering a draft PAN without proof of sending did not discharge that burden. Failure to comply with Section 228 and RR No. 12-99 voided the assessments.

Evidence first offered at the Supreme Court is too late #

The CIR’s new annexes proving PAN receipt had not been offered before the CTA Division or En Banc. The Supreme Court is not a trier of facts and will not sift evidence never authenticated in the tax court. Because the PAN proof was never part of the CTA record, “there is nothing for this Court to consider.” The CIR therefore still failed to establish issuance of the PAN to Unioil.

FAN timing, bases, and prescription independently fail #

Beyond the PAN defect, the Court found the FLD/FAN “ostensible automated assessments merely echoing the PAN,” issued in haste after Unioil’s PAN protest and without due consideration of Unioil’s arguments — echoing the due-process discipline in CIR v. Avon Products Manufacturing, Inc.. The notices mis-cited “Section 72(e)” of the NIRC (a subsection that does not exist) and did not clearly tie the assessment to specific monthly remittance-return filing dates.

On prescription, the Court reiterated that withholding taxes are internal revenue taxes covered by Section 203’s three-year limit (CIR v. La Flor Dela Isabela, Inc.). The CIR’s bare invocation of Section 72 / fraud exceptions under Section 222 was unsubstantiated: fraud is never presumed, and mere understatement is not proof of fraudulent returns. The Court also clarified — citing CIR v. Transitions Optical Philippines, Inc. — that the assessment that stops the three-year clock is service of the FAN, not the PAN. A PAN informs and invites a reply; a FAN demands payment and starts protest and interest clocks.

Our insights #

PAN doctrine sits beside other due-process voids in this series #

Unioil is the PAN-issuance chapter of a larger assessment-process line. Mannasoft Technology v. CIR voids assessments when notices reach unauthorized recipients. CIR v. Maxicare voids an FDDA issued before the 60-day reinvestigation document window closes. Unioil voids the chain when the BIR cannot prove the PAN step happened at all. Different facts; same rule: Section 228 and RR No. 12-99 (as amended by later regulations) are mandatory, not optional choreography.

Practitioner notes emphasize the early-settlement purpose of the PAN #

ASG Law Partners’ case note on Unioil stresses that without a proven PAN, the subsequent FAN is vulnerable, and that the Supreme Court refused to entertain late-introduced receipt proof. GQ Law’s assessment-procedure explainer cites Unioil for the proposition that the PAN is part of due process because it lets the taxpayer and the CIR settle before a FAN is needed — language that tracks Transitions Optical as quoted in the decision itself.

Withholding assessments are not a shortcut around Section 203 #

Unioil also matters for withholding agents: deficiency WTC/EWT assessments are still ordinary internal revenue tax assessments for limitation purposes. Labeling the taxpayer a withholding agent, or citing Section 72 without proving fraud or falsity, does not automatically buy the BIR a longer assessment window.

What this means for taxpayers #

If you are under audit for withholding tax on compensation, expanded withholding tax, or related remittance returns:

• In any protest or CTA petition, expressly put the BIR to its proof on PAN issuance and receipt — registry claims and draft notices are not enough if delivery is disputed.
• Keep your own receiving copies, registry receipts, and counsel stamps; Unioil shows those records can become central exhibits.
• Do not assume the Supreme Court will accept documents the CIR forgot to offer at the CTA.
• Calendar the three-year assessment period from the relevant withholding-return filing deadlines; the FAN (not the PAN) is the assessment that matters for Section 203.
• Read the FLD/FAN for stated facts and law — missing, boilerplate, or nonsensical citations (as with the non-existent “Section 72(e)”) are due-process issues in their own right.

For how withholding certificates and remittance documentation feed compliance upstream of any assessment fight, see the site’s BIR Form 2307 guides.

Summary #

CIR v. Unioil holds that a deficiency withholding assessment built without a proven Preliminary Assessment Notice violates Section 228 and RR No. 12-99 and is void. Proof of the PAN must be made in the CTA; annexes debuted at the Supreme Court do not count. The Court also sustained cancellation on independent grounds: a hasty, inadequately reasoned FLD/FAN and a prescribed assessment under Section 203. Together with Mannasoft and Maxicare, Unioil is a reminder that withholding-tax collection still has to clear every mandatory notice step before the BIR can demand payment.

Sources #

Primary sources

• LawPhil.net — G.R. No. 204405 Decision, August 4, 2021
• Chan Robles Virtual Law Library — G.R. No. 204405 Decision, August 2021

Secondary sources

• ASG Law Partners — Navigating Tax Assessments: The Critical Role of Due Process and Timely Notices
• GQ Law — Assessment procedure note citing Unioil on the PAN as due process