Era of CoreTax Begins: BDO in Indonesia Prepares Corporations to Face the New Paradigm of Tax Reporting 2026

Photo: BDO Indonesia

JAKARTA - The Indonesian tax administration has officially entered a new era of digital integration and real-time transparency. With the full implementation of the Tax Administration Core System (SIAP) or CoreTax, the Directorate General of Taxes (DJP) has retired old platforms such as DJP Online and the e-Invoice desktop application.

Ahead of the crucial deadline of April 30, 2026 for the submission of the Annual Income Tax Return of the Agency for the 2025 tax year, which is the first annual reporting that must be carried out entirely through the CoreTax framework, companies must realize that this change is much bigger than just an improvement in the system. This signifies a fundamental shift in the way corporations interact with the state.

From Historical Reporting to Real-Time Validation

This new system is built on full integration, where every e-Invoice issued and every proof of cut (e-Bupot) made will be directly entered into the corporate taxpayer's general ledger in real-time. The impact, when preparing the Annual Income Tax Return, most of the data will be available pre-populated based on monthly reporting activities.

This transition effectively ends the era of "year-end reconciliation" and brings businesses into the era of "continuous accuracy". The CoreTax architecture is designed to identify data inconsistencies even before the tax return is successfully submitted.

"The presence of CoreTax is not merely an update of the technical system, but a fundamental reconfiguration of tax governance in Indonesia," said Irwan Kusumanto, Managing Partner of KKP Kusumanto & Partners and Head of Tax BDO Indonesia.

"With validation now being real-time, data integrity becomes a strategic asset. 'Data hygiene' or data hygiene is no longer just an administrative task behind the scenes, but a strategic necessity for corporate leadership to mitigate audit risks and ensure ongoing compliance," he added.

Three Strategic Pillars for Company Leaders

KKP Kusumanto & Partners recommends three main pillars for the Company's management in navigating this new ecosystem:

● Strengthening Data Governance: Ensuring data integrity on vendor NPWP, Business Field Classification Code (KLU), and ERP integration because DJP now has direct transaction-level visibility. ● Securing Digital Authority: Replacing the old EFIN framework with digital certificate-based authentication tied to officially registered Person-in-Charge (PIC). ● Improving Tax Functions: Shifting the focus of tax professionals from manual tasks to data analysis and internal control monitoring.

"The KKP Kusumanto & Partners tax team is committed to helping companies pass through this transition period through comprehensive services. Our services include support for the implementation of CoreTax, activation of new digital certificates, to tax compliance health checks to ensure the alignment of internal records with the pre-populated data provided by the DJP. Navigating this new national tax system requires a deep understanding of the regulatory intent as well as strategic data management. With the right preparation, the transition to CoreTax can be a golden opportunity for companies to strengthen governance and improve long-term compliance resilience," concluded Irwan Kusumanto.