Beware of Tax Extrapolation Methods! Lessons from PT WCM’s Defeat in a Vehicle Sales Dispute.

VAT Dispute: Extrapolation Methods, Internal Document Findings, and Unreported Deliveries for PT WCM

The tax dispute between PT WCM and the Directorate General of Taxes (DGT) culminated in the reading of Tax Court Decision Number PUT-004624.16/2022/PP/M.XA in early 2025. This case highlights the correction of the Value Added Tax (VAT) Tax Base for the December 2018 period, stemming from internal document findings during a field audit. The primary focus of this dispute lies in the use of the extrapolation method by tax auditors to determine the value of deliveries deemed unreported by the Taxpayer.

Core Conflict: Proforma Invoices vs. Real Transaction Standards

The core conflict began when the Respondent discovered internal documents (notes or proforma invoices) indicating vehicle sales volumes exceeding the figures reported in the VAT Return. As supporting documents were not fully available for the entire period, the Respondent applied an extrapolation technique to calculate potential hidden turnover. Conversely, PT WCM vehemently challenged this method, arguing that the correction was assumptive and violated Article 12 paragraph (3) of the KUP Law, as it was not based on real transaction data valid under accounting and tax standards.

Judicial Resolution: Legality of Indirect Audit Methods

The Board of Judges, in its resolution, provided a legal opinion strengthening the fiscal position. The Board assessed that in conditions where the Taxpayer cannot provide convincing counter-evidence against internal document findings, the use of indirect methods such as extrapolation by the Respondent is considered legally valid to determine the amount of tax due. The Board emphasized that the Taxpayer's bookkeeping is deemed unreliable if there is material evidence showing deliveries of taxable goods for which VAT was not collected.

Implications: Internal Document Discipline and Prima Facie Evidence

The implications of this decision send a strong signal to Taxpayers to be more disciplined in managing internal and proforma documents to prevent them from backfiring during audits. This ruling confirms that the extrapolation method, though estimative, holds legal weight before the judges if supported by strong prima facie evidence and the Taxpayer's failure to prove otherwise. In conclusion, synchronized tax administration between sales and accounting departments is vital to avoid significant corrections that are difficult to refute in court.

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