Amending a Tax Return is a constitutional right of taxpayers under the self-assessment system; however, this right immediately expires once the tax authority has commenced a field audit. The PT OIU case serves as a stern reminder that the certainty of tax status under PP 46/2013 depends heavily on formal data reported in a timely manner, rather than on subsequent turnover claims made after a dispute arises during an audit.
The conflict began when PT OIU claimed they should have used the general rate of Article 17 of the Indonesian Income Tax Law (UU PPh) for the October 2017 period, arguing that their actual 2016 turnover exceeded IDR 4.8 billion. However, the DJP found that in the original 2016 Tax Return, the reported gross turnover was still below the threshold. PT OIU attempted to amend the 2016 return while the 2017 audit was underway, but the DJP rejected this based on the limitations set out in Article 8 of the UU KUP.
The Tax Court Judges, in their consideration, emphasized that tax rate determination for a given year must be based on legally valid data from the previous year. Since the amendment was made post-SPHP (Notification of Audit Results), it held no legal power to change the established tax subject status. The judges also highlighted PT OIU's failure to provide valid accounting evidence to support the claimed increase in turnover.
This decision has significant implications for tax practitioners: the accuracy of Tax Return reporting is non-negotiable for determining the current year's tax scheme. Taxpayers are prohibited from speculating by changing tax rates midway without procedural amendments and strong material evidence. Data inconsistency between reported turnover and business reality will only lead to tax base corrections and heavy administrative sanctions.
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