Tax authorities frequently utilize extrapolation methods during audits to mitigate potential tax loss risks, yet this ruling reinforces that such methods without competent evidence constitute a substantial violation of the principle of legal certainty. The dispute arose from the Respondent's correction of Income Tax Article 23 objects for the December 2020 tax period amounting to IDR 11,083,133,157.00 against PT ADR, based solely on equalizing findings from previous tax periods without any concrete evidence of technical service delivery in the period concerned.
The core of the conflict in this case centers on the validity of the basis for tax object assessment by the Directorate General of Taxes (DGP). The Respondent argued that based on audit results from prior periods, there was a pattern of unreported technical service transactions, thus extrapolation was applied to determine the object value for December 2020. Conversely, the Taxpayer (PT ADR) firmly denied the existence of these transactions, stating that the figures in the correction were merely unilateral mathematical calculations and did not reflect real cash flows or service payment obligations as mandated by Article 23 of the Income Tax Law.
The Tax Court Judges, in their legal considerations, provided clear boundaries regarding the burden of proof. The Panel opined that every material correction must be based on specific physical evidence such as contracts, invoices, or proof of payment within that tax period. Since the Respondent was unable to produce source documents proving the delivery of technical services in December 2020, the extrapolation method used was deemed to lack a strong factual foundation and was canceled by law.
The implications of this ruling are crucial for Indonesian tax practice, particularly as a precedent that the self-assessment principle must be respected unless authorities can prove non-compliance with tangible evidence, rather than mere statistical assumptions. For Taxpayers, this case emphasizes the importance of meticulous documentation and the ability to prove the absence of transactions through consistent bookkeeping. This decision restores the essence of justice—that tax is only levied on objects that have genuinely met the subjective and objective requirements of the prevailing regulations.