Guide to Bupot A1 in Coretax: 2026 Steps for PT PMA Owners in Indonesia
Running a business as a foreigner in Indonesia often involves navigating a complex web of evolving regulations. 2026 brings a significant shift with the mandatory implementation of the Coretax administration system.
For many expats operating a company, the transition from legacy systems to a fully integrated digital platform has created uncertainty regarding year-end payroll obligations.
Specifically, the issuance of the annual withholding slip for permanent employees, known as Form 1721-A1, has moved entirely to a digital format. This leaves many business owners worried about compliance errors that could trigger audits or penalties.
The concern among business owners is justified, as the new system automates calculations and cross-references data in real-time. Manual overrides or “fixing it later” are no longer viable options in this strict digital environment.
Failing to correctly generate and distribute the Bupot A1 in Coretax can result in your employees being unable to file their personal Annual Tax Returns (SPT Tahunan). This leads to internal friction and potential flags on your corporate tax record.
Furthermore, under PER-11/PJ/2025, the integration between your monthly payroll and the annual report is tighter than ever. It requires precise reconciliation of every Rupiah paid throughout the fiscal year.
Fortunately, while the interface is new, the underlying logic remains grounded in established tax principles. Mastering the workflow is achievable with the right guidance.
This comprehensive guide provides a step-by-step walkthrough for PT PMA owners to navigate the Directorate General of Taxes (DJP) portal effectively. By following these instructions, you will ensure that your company correctly issues the necessary electronic withholding certificate.
You will maintain full compliance with Indonesian tax laws and avoid the common administrative pitfalls that plague many foreign-owned businesses during tax season.
Table of Contents
- Understanding the Bupot A1 (BPA1) and Employer Obligations in Indonesia
- Key Coretax Regulations under PER-11/PJ/2025
- Essential Data Preparation Before Logging In
- Step-by-Step Workflow to Create Bupot A1 in Coretax
- Real Story: The Missing "Publish" Button in Canggu
- Technical Specifications: Codes, Signatures, and Rounding
- Common Mistakes and Audit Triggers for PT PMA
- Finalizing, Integration, and Deadlines for Business in Bali
- FAQs about Bupot A1
Understanding the Bupot A1 (BPA1) and Employer Obligations in Indonesia
The term “Bupot” is an abbreviation for Bukti Potong (Withholding Proof). The A1 form—technically referred to as BPA1 in the new system—is the official document certifying that tax has been withheld from a permanent employee’s salary over the course of a tax year.
For any PT PMA (Foreign Capital Investment Company) acting as an employer in Indonesia, issuing this document is mandatory. It applies to every employee classified as Pegawai Tetap (permanent employee) or a pensioner receiving periodic income.
In the past, these forms might have been generated via desktop software or even Excel spreadsheets. However, the introduction of the fully digital A1 form within the Coretax platform centralizes this process.
The form aggregates the total gross income, including basic salary, allowances, THR (religious holiday allowance), and bonuses. It compares this against the tax already remitted from January to November.
The system then calculates the final tax liability for December. It determines if there is a shortfall (Kurang Bayar) or an overpayment (Lebih Bayar) that needs adjustment.
This document serves a dual purpose for compliance. First, it proves that your company has fulfilled its withholding tax obligations to the state. Second, it is the primary document your employees need to file their own personal income tax returns (SPT 1770 S/SS).
Without a valid Bupot A1 in Coretax, your staff cannot legally report their taxes. This creates compliance issues that reflect poorly on your company’s standing with the tax office.
The regulatory framework for the current tax year is anchored in PER-11/PJ/2025. This regulation dictates the technical standards for electronic withholding slips.
The most distinct change for PT PMA owners is that the standard Form 1721-A1 generated via the portal is now a “system-generated” document.
You cannot simply type in a number manually anymore. The system assigns a unique reference number automatically upon creation. This ensures that no two slips share the same identity across the national database.
Another critical update in the regulation is the elimination of “wet” signatures and physical stamps for these documents. The Bupot A1 in Coretax utilizes a standardized electronic signature and a Quick Response (QR) code validation.
When you generate the document within the portal, the system automatically embeds these security features. This shift is designed to reduce forgery and administrative burden for business owners.
It also means that the “issuer” listed in the system must be the authorized signatory. This is usually the Director registered in the company deed or NIB.
Furthermore, PER-11/PJ/2025 mandates that the formatting of amounts must adhere to strict rounding rules. The system generally rounds down PPh 21 values to the nearest Rupiah, eliminating cents in the final calculation.
Understanding these regulatory baselines is crucial. The Coretax system will reject inputs that do not align with the pre-set logic defined by this regulation. This forces you to correct data before you can finalize the issuance, often causing delays if you are not prepared.
Before you even attempt to access the Coretax dashboard, successful issuance depends heavily on the accuracy of your offline data preparation. Creating a compliant annual tax certificate within the portal requires a full reconciliation of the 12-month payroll cycle.
You must have your figures ready before clicking any buttons. You must consolidate data regarding monthly gross income. Ensure that benefits in kind (Natura), which may now be taxable under certain conditions, are correctly categorized.
You must verify the personal data of every employee carefully. The Coretax system is integrated with the Department of Population and Civil Registration (Dukcapil).
Therefore, if an employee’s NIK (National ID Number) does not match the name or address on file, the system may block the creation of the withholding slip.
Ensure you have the correct NIK, NPWP (Tax ID), current address, and marital status (PTKP code like K/0, TK/0) for each staff member.
Additionally, you need to tally the PPh 21 that was already withheld and reported from January through November. The generation of the final tax document within the interface is essentially a balancing act.
The system will take the total annual tax due and subtract what you have already paid. Discrepancies here will lead to a Kurang Bayar or Lebih Bayar status for the December period.
Having this data organized in a spreadsheet that mirrors the Coretax import template will save you hours of troubleshooting.
Once your data is ready, the actual process involves specific navigation within the DJP portal. Follow this workflow to generate the necessary annual withholding evidence for your employees.
- Login and Role Selection: Access the Coretax DJP portal using your company’s NPWP and password. Once logged in, ensure you switch your profile role to “Badan” (Corporate) rather than your personal tax profile.
- Access the Menu: Navigate to the “e-Bupot 21/26” menu. From there, select the option for “BPA1” (Bukti Pemotongan A1) and ensure the tax period is set to the last month of the fiscal year (December).
- Input Data (Manual or Import): For companies with few employees, you can click “Create” and input data manually. For larger teams, use the “Import Data” function with the standardized CSV/XML template provided by DJP.
- Fill General Section (Bagian Umum): The system will auto-generate the slip number. You must confirm the income period (01-12) and select “Tidak Final” (Non-Final) for regular permanent employees.
- Employee Details: Input the NIK. The system should auto-populate the name and NPWP if valid. Verify the marital status and number of dependents (Tanggungan) as this dictates the non-taxable income threshold.
- Income and Deductions: Enter the gross annual income and valid deductions (occupational costs/Biaya Jabatan, pension contributions). The system will automatically calculate the Net Income and the PPh 21 due for the year.
- Review Calculation: Check the system-calculated tax against your internal payroll records. If the numbers align, save the draft.
Publish (Terbitkan): This is the most critical step. A saved draft is not valid. You must select the drafts and click “Terbitkan” (Publish) to generate the QR code and finalize the Bupot A1 in Coretax.
Meet Hannah, a 38-year-old sustainable fashion consultant from Munich, Germany. She moved to the frantic yet inspiring streets of Canggu, Bali, in late 2023. For her first two years of operation, she relied entirely on a local freelance accountant to manage her payroll compliance.
However, with the 2026 mandatory shift to Coretax, her accountant was fully booked with larger corporate clients. This left Hannah to navigate the DJP portal alone for the first time.
Hannah felt confident after successfully uploading her employee CSV files and seeing the green “Saved” indicators.
She assumed the hard work was done. Two weeks later, her office manager tried to file her personal taxes but found the PDF Hannah sent was invalid. It lacked the mandatory QR code.
Panic set in as the March deadline loomed for her employees. Hannah realized that in the new system, saving data does not equal filing.
She had missed the specific “Terbitkan” (Publish) button, a critical final validation step hidden in the sub-menu. Once she located and clicked it, the legally required electronic tax certificate instantly generated the required digital signature.
This simple click turned a potential compliance disaster into a solved puzzle, teaching her the importance of thorough digital verification.
When generating the annual tax forms, attention to technical detail is paramount. One specific area is the “Kode Objek Pajak” (Tax Object Code). For standard permanent employees, you must ensure the code selected aligns with Pegawai Tetap regulations.
Selecting a code meant for freelancers or casual workers will trigger a mismatch in the tax calculation formula, as the progressive rates apply differently.
Digital signatures in Coretax are legally binding. When you click “Terbitkan,” the system applies a digital certificate associated with your company’s tax identity. There is no need to print these forms, sign them with a pen, and scan them.
The QR code located at the bottom of the digitally generated tax slip serves as the validation mechanism. Third parties, including the tax office, can scan this code to verify the document’s authenticity immediately.
Rounding is another technical aspect enforced by the system. In the past, manual rounding might have varied between accountants. Now, the system truncates amounts strictly. For example, a tax calculation of Rp 1,500,500.75 will be rendered as Rp 1,500,500.
This ensures consistency across the national database but requires your internal payroll software to match this logic to the Rupiah to avoid reconciliation errors during the upload process.
Even with a digitized system, human error remains a risk. A frequent mistake is the incorrect input of “Tanggungan” (Dependents). If an employee got married or had a child in 2025 but did not update their data with HR, the automated withholding form might be generated using the old status.
This results in a lower non-taxable income threshold (PTKP) and an over-deduction of tax. It forces the employee to claim a refund later, a process that often triggers a tax audit for the company.
Another major error is failing to synchronize the Annual A1 form with the December Monthly Tax Return (SPT Masa). Some business owners generate the A1 but forget to attach or reference these generated slips in their December reporting.
The tax office’s system expects the total tax due in the December report to match the aggregate of all issued A1 forms. If these figures diverge, it is an automatic red flag in the Coretax algorithm.
Lastly, leaving forms in “Draft” mode is a common oversight. As illustrated in Hannah’s story, a draft has no legal standing. Until the status changes to “Terbit,” the digital tax document created in the system is invisible to the tax authority.
This can lead to accusations of failing to issue withholding proof, which carries administrative sanctions under the KUP (General Provisions and Tax Procedures) Law.
Once you have successfully published the slips, the final phase is distribution and reporting. You must download the finalized electronic withholding files. These are available in both PDF and XML formats.
The PDF should be emailed or securely distributed to each employee. It is good practice to have employees sign a receipt or acknowledge via email that they have received the document. This protects your company from future disputes.
The process then moves to the SPT Masa PPh 21 section of Coretax for the December period, where the system “pulls” data from the published slips. Submit the SPT Masa only after confirming that all A1s are accounted for; the Bukti Penerimaan Elektronik is your final proof of annual payroll tax compliance.
Time is of the essence when dealing with the mandatory digital tax certification process. While the official regulation PER-11/PJ/2025 may contain specific technical dates, the practical deadline is driven by the employee.
Employees are obliged to file their personal taxes by March 31st. Therefore, it is industry standard to issue the A1 form to employees by the end of January or, at the very latest, February. Issuing the form late forces your employees to file their personal returns late. This incurs a fine for them and creates dissatisfaction.
However, the greater risk lies with the company. If the December SPT Masa (which contains the A1 data) is not filed by its deadline, the PT PMA faces late filing fines. More severe than the standard administrative fines are the potential audit consequences.
A pattern of late or inaccurate issuance of Bupot A1 in Coretax can categorize your company as “High Risk.” This leads to more frequent scrutiny of your corporate income tax (CIT) and VAT (PPN) returns.
Compliance in this area is a strong signal to the tax office that your business is well-governed and transparent.
It is the annual tax withholding certificate (Form 1721-A1) for permanent employees in Indonesia.
No, Bupot A1 in Coretax uses a digital signature and QR code; wet signatures are not required.
Ideally by January or February, so employees can file their personal taxes before March 31.
Yes, but you must create a "Bukti Potong Pembetulan" (Correction) in Coretax, not just edit the old one.
Yes, effective from the 2025 tax year, using Coretax is mandatory for withholding tax reporting.
You risk audits, fines for late reporting, and employees being unable to file their annual SPT.
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