Indonesia's Coretax System Shows Significant Improvement

Enhanced Capabilities After Rigorous Testing

Indonesia's tax administration system, Coretax, has demonstrated substantial progress following comprehensive testing throughout 2025. The Director General of Taxes, Bimo Wijayanto, confirmed that the system is now ready to support the annual tax filing process in 2026, which is expected to handle 13 million tax returns ¹

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Testing and Validation Process

The Coretax system underwent two major trial runs during 2025. The first test, conducted in November 2025, involved approximately 25,000 tax officials and showed significant improvement compared to previous tests ¹

. These rigorous tests have instilled confidence in the system's ability to manage the upcoming tax season.

Current Adoption Status

Despite the system's improved capabilities, taxpayer adoption remains a challenge. As of December 2025, only 7.7 million taxpayers (51.66% of the total 14.9 million) who are required to file tax returns have activated their Coretax accounts ³

. This indicates that nearly half of the taxpayers still need to engage with the new system.

Government's Next Steps

Finance Minister Purbaya Yudhi Sadewa emphasized that while the core Coretax system is functioning well, the government remains committed to making further improvements where needed. The ministry is particularly focused on ensuring the system's resilience and capacity to handle the tax filing surge ²

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Implications for Tax Compliance

The successful implementation of Coretax is crucial for Indonesia's tax compliance and revenue collection efforts. With the system now deemed ready for the 2026 tax season, the focus will shift to encouraging broader taxpayer participation and addressing any remaining technical issues.