The implementation of the Coretax Administration System (CTAS) marks a major shift in Annual Tax Return (SPT) reporting for Individual Taxpayers (WPOP) starting in 2026. This digital system strengthens transparency, data accuracy, and taxpayer independence through integrated services and real-time recording. Key changes include the use of the National Identity Number (NIK) as the tax identity, the standardization of Annual Tax Return forms, and the mandatory reporting of current values and sources of asset ownership. While the automatic integration of withholding slips and population data enhances efficiency, it still requires independent verification by the taxpayer. Furthermore, determining family tax status has become increasingly crucial as it directly impacts tax calculations. This transformation is expected to bolster compliance and support a more modern tax governance framework. SW Tax Consulting stands ready to assist Individual Taxpayers throughout this adaptation process, ensuring that tax compliance becomes an integral part of their financial planning and business sustainability.
iWith the implementation of the Core Tax Administration System (CTAS) as part of the digital transformation of tax administration in Indonesia, the active role of taxpayers has become increasingly crucial in ensuring that the system runs optimally. The digitization of tax services has changed, not only the way taxes are reported and paid, but has also encouraged changes in compliance behavior through ease of access, data transparency, and service integration on a single platform.
In an increasingly digitized taxation ecosystem, Individual Taxpayers are now faced with more independent responsibilities in managing their tax administration. An integrated system allows every tax transaction to be recorded systematically and in real time, thereby minimizing reporting errors and improving data accuracy. This requires taxpayers to have a better understanding of their tax rights and obligations attached to their personal and professional economic activities.
Tax compliance by individual taxpayers is one of the main foundations for maintaining the stability of state revenue. The taxes paid by individuals directly contribute to financing national development, such as infrastructure, education, health, and other public services.
The year 2026 will mark the first time that Individual Taxpayers report their Annual Tax Returns using the Core Tax Administration System (CTAS). The deadline for reporting Individual Taxpayers Annual Tax Returns on March 31, 2026, poses its own challenges for taxpayers and the Directorate General of Taxes. As an integrated platform, CTAS introduces several adjustments with the aim of improving supervision and making it easier for taxpayers to file their Annual Tax Returns.
The alignment of the National Identity Number (“NIK”) with the Taxpayer Identification Number (“NPWP”) has resulted in the equal distribution of taxes among all Indonesian citizens, not limited to those who have an NPWP. This has led to a change in the User ID for Individual Taxpayers when logging into the taxation system, which previously used the NPWP and now uses the NIK.
The implementation of CTAS has brought changes not only to the aspects of access and identity of Individual Taxpayers, but also to the form and method of filling out the Annual Tax Return. Here are some of the changes to the Individual Annual Tax Return form:
- Standardization of Annual Tax Return Forms
Previously, the Annual Tax Return Form consisted of three types of forms for specific taxpayer criteria and limitations, namely:
- 1770-SS, for taxpayers who have income from only one employer with gross income from employment not exceeding Rp60,000,000.00 (sixty million rupiah) per year.
- 1770-S, for taxpayers who have income from one or more employers, other domestic entities, and/or who are subject to final and/or definitive income tax.
- 1770, for taxpayers who have income from business/self-employment, from one or more employers, who are subject to Final Income Tax and/or Final Tax, and/or other domestic/foreign income.
Currently, with the introduction of CTAS, the Annual Tax Return has been simplified into a single reporting form, which is filled out directly on the CTAS platform. The structure and contents of the Annual Tax Return form are systematically adjusted by selecting the appropriate questions on CTAS. Taxpayers will be directed to fill in the required sections of the form according to their profile. This aims to improve data consistency and reduce the complexity of form selection.
- Additional information in the form of current value and source of ownership on the Taxpayer Asset List Form
Coretax introduces adjustments to the information that must be disclosed by Individual Taxpayers, particularly in relation to asset reporting. Previously, taxpayers were generally only required to disclose the acquisition value, but Coretax now requires the current value or price of certain assets to be filled in.
The disclosure of current values is intended to provide a more up-to-date picture of taxpayers’ economic positions and support improvements in data quality within the tax administration system. This information also enables a more comprehensive analysis of asset value developments over time.
In addition to current values, Coretax also requires the disclosure of additional information related to asset ownership, which is differentiated based on the type of asset. For immovable assets, taxpayers are required to list the source of ownership, including whether the assets were obtained through debt, inheritance, grants, gifts, personal earnings, or other sources. Meanwhile, for movable assets, taxpayers are required to disclose the ownership status, whether the assets are in the taxpayer’s name or in the name of another party.
This approach reflects a shift in the tax reporting system towards greater transparency and relevance of information.
- Income Tax Withholding Slip and Taxpayer Information have been integrated
Coretax improves the Annual Tax Return reporting process through the integration of tax withholding data reported by withholding agents, such as withholding tax on Income Tax Article 21 (Form A1/A2), Final Income Tax, Income Tax Article 23, and other income tax withholding or collection evidence. This withholding tax evidence data is automatically linked and displayed in each Taxpayer’s CTAS account.
However, the availability of this data remains dependent on the accuracy and completeness of the reporting by the withholding agent. Therefore, taxpayers still need to review the data listed before submitting their Annual Tax Returns.
In addition to Income Tax Withholding Slip, Taxpayer information in the form of marital status registered with the Population and Civil Registration Office (“Dukcapil”) to determine Non-Taxable Income (“PTKP”) has also been automatically integrated and synchronized with CTAS.
However, Taxpayers remain responsible for ensuring the accuracy of the family tax status used in their Annual Tax Return, including the tax status of the husband and wife, such as PH (Separate Property), MT (Separate Tax Return), KK (Head of Family), or HB (Separate Living). The determination of this status has a direct impact on the calculation of taxable income, the consolidation or separation of husband-and-wife income, and the utilization of Non-Taxable Income (PTKP). Individual Taxpayers are advised to review the family tax status listed in CTAS before submitting their Annual Tax Return.
Compliance with tax obligations not only protects taxpayers from administrative sanctions but also reflects their responsibility as citizens in supporting sustainable national development. In addition, a good tax compliance track record can provide indirect benefits, such as ease in applying for loans, business financing, and other administrative matters that require financial capacity validation.
Ultimately, personal tax compliance is not merely a legal obligation, but also part of family financial planning and business sustainability. Orderly tax administration minimizes financial risks, maintains family peace of mind, and allows business operations to run more smoothly.
Tax compliance today is an investment in certainty for the future—so that families can remain secure and businesses can continue to grow without obstacles. Therefore, SW Tax Consulting also assists Individual Taxpayers in complying with tax regulations in order to support family and business financial planning in accordance with the applicable tax regulations in Indonesia.
