Bank Secrecy Is Not a Barrier to Winning Tax Disputes: Lessons from the PT B Case

Final Income Tax Dispute of PT B: Bank Secrecy Dualism and Customer Data Disclosure in Tax Base Verification

Tax disputes in the banking industry often trigger a conflict between the obligation to maintain customer data confidentiality and the transparency required during tax audits. The case involving PT B regarding the correction of Article 4 (2) Final Income Tax for the November 2013 Tax Period serves as an important precedent on how the evidence verification mechanism in the Tax Court can bridge this regulatory dualism. The Respondent made a correction to the Tax Base (DPP) amounting to IDR 1,598,365,802.00 because the Petitioner was deemed unable to prove the details of interest excluded from tax objects due to bank secrecy regulations.

The Core Conflict: Demand for By Name By Address Details vs. Administrative Boundaries of Bank Secrecy Disclosures

The core of the conflict is rooted in differing interpretations of customer data access between the Banking Law and the General Tax Provisions and Procedures (KUP) Law. The Respondent argued that without "by name by address" details, the validity of non-withholding interest—such as interest for Pension Funds with valid Tax Exemption Letters (SKB), government fund placements (APBN/APBD), and balances below the threshold—could not be verified. On the other hand, the Petitioner emphasized that procedurally, the disclosure of bank secrets can only be carried out through a written order from the leadership of BI or OJK, thus providing aggregate data was the maximum limit of compliance during the administrative stage.

Judges' Legal Consideration: Article 59 of the Tax Court Law as Lex Specialis for the Interest of Justice

The Board of Judges, in its legal consideration, reaffirmed the position of Article 59 of the Tax Court Law as lex specialis, where the obligation to keep secrets due to position is waived for the interest of justice. Through a comprehensive evidence verification process at trial, the Petitioner finally disclosed customer detail data, bank statements, and relevant SKB documents. Verification results showed that most of the Respondent's corrections indeed targeted transactions that legally were not tax objects or received exemption facilities.

Ruling and Implications: Partial Victory and the Critical Necessity of Full Material Disclosure in POTPUT Equalization

The resolution of this case provided a partial victory for the Taxpayer, where the Board of Judges canceled corrections on interest for government and pension funds but upheld corrections on "timing differences" in accruals that were not supported by strong evidence. The implication of this decision confirms that although bank secrecy is very strict at the audit stage, Taxpayers must be prepared to make full disclosure before the Board of Judges to win the material substance of the dispute. A neat documentation strategy from the transaction stage is the primary key in facing POTPUT tax object equalization.

A Comprehensive Analysis and the Tax Court Decision on This Dispute Are Available Here