Indonesia's Directorate General of Taxes (Direktorat Jenderal Pajak / DJP) revoked 42 long-standing tax regulations in a single stroke when it launched the Core Tax Administration System (CTAS) on 1 January 2025. It is the biggest overhaul of the country's tax administration in decades, and it forms the foundation of the CTAS 2026 requirements now in force.
In this blog, we discuss what Coretax CTAS is and which CTAS 2026 requirements apply to PT PMAs — foreign-owned limited liability companies (Perseroan Terbatas Penanaman Modal Asing). We also cover the records every foreign-owned company should reconcile before filing its annual corporate income tax return (SPT Tahunan Badan), which falls due on 30 April 2026 for calendar-year companies.
What Is Coretax CTAS and Why Do the CTAS 2026 Requirements Matter?
Coretax CTAS is the DJP's integrated core tax administration platform. In 2026 it is the single system through which a PT PMA registers, files, pays and invoices.
The legal foundation is Minister of Finance Regulation Number 81 of 2024 (PMK-81). It was promulgated on 18 October 2024 and took effect from 1 January 2025. As summarized in Core Tax Administration System guidance issued under PMK-81, the regulation streamlines registration, filing, payment and collection processes. It also supersedes dozens of older rules.
The practical difference is real-time data matching. When a vendor issues an electronic VAT invoice (e-Faktur) to a PT PMA, the DJP's database records it immediately. When the company later files its VAT return, the DJP already holds the counterparty's version of the same transaction. Declared input VAT that the counterparty never reported as output VAT can surface through this cross-checking. The DJP may then follow up with a query.
A second 2026-specific change concerns taxpayer identity. The old 15-digit tax identification number (Nomor Pokok Wajib Pajak / NPWP) is being replaced by a 16-digit format, with corporate entities receiving a prefix attached to their existing registration number. The 16-digit identity is not a separate tax obligation in itself; it is tied to Coretax account activation and access. Companies whose Coretax accounts are not activated with the validated identity format cannot access the portal, issue invoices or run payroll through the system.
The next section breaks down the requirements that matter most to a foreign-owned company.
Which CTAS 2026 Requirements Apply to Foreign-Owned Companies?
Four requirements sit at the centre of CTAS 2026 compliance:
- a validated 16-digit NPWP
- a configured person in charge (PIC)
- centralized VAT invoicing
- a synchronized monthly filing calendar
The requirements themselves are not new taxes — they are new operating rules for taxes PT PMAs already pay. What has changed is the sequencing: identity, access and invoicing must be configured correctly at the front end, or everything downstream fails.
The DJP's Coretax platform documentation sets out how registration, invoicing and filing now operate within a single system. The points below break down the requirements that affect foreign investors most directly.
1. Validated taxpayer identity and PIC configuration
Every company must complete the 16-digit NPWP migration and appoint a PIC — the individual who enters Coretax on the company's behalf. The PIC obtains a digital certificate, manages user access and remains responsible for tax reporting. Multiple staff should never share one company account; authorization flows through the PIC's individual account.
2. VAT registration and e-Faktur discipline
A PT PMA registered as a Taxable Entrepreneur (Pengusaha Kena Pajak / PKP) must issue VAT invoices through Coretax for every taxable supply. PKP registration becomes mandatory once annual revenue reaches IDR 4.8 billion. The statutory VAT rate is 12%, although most business-to-business transactions are billed at an effective 11% rate, with the higher rate reserved for luxury goods and certain sectors.
3. A synchronized monthly filing calendar
Withholding taxes and VAT run on parallel monthly cycles, with payments and returns generally due in the following month. Coretax pre-populates VAT returns from e-Faktur data. An invoice issued with a wrong code, amount or date can propagate from the monthly return into the annual reconciliation. Companies still establishing operations can map the full calendar with our infographic. It covers the monthly tax obligations for Indonesia PT PMAs in 2026.
Coretax CTAS Changes and Their Impact on PT PMAs
| Matter | Change under Coretax | Impact on a PT PMA |
|---|---|---|
| Taxpayer identity | 16-digit NPWP format mandatory in 2026 | Unvalidated IDs block portal access, invoicing and payroll |
| Tax account | Company account linked to an individual PIC | Incorrect PIC setup disrupts filing, signing and authorization |
| VAT invoicing | All e-Faktur must enter the DJP system at the point of transaction | Buyer input VAT credits and monthly PPN returns depend on accurate data |
| Monthly filing | PPh and PPN data centralized and cross-matched | Finance, payroll, procurement and sales data need monthly reconciliation |
| Annual filing | Return integrates monthly filings, payments and related-party documents | Last-minute document collection creates discrepancies the system flags |
What Should a PT PMA Reconcile First Before Filing Its Annual Return?
Reconcile in this order: system access, VAT invoices, withholding tax records, payment receipts, the book-to-tax bridge, and related-party transactions.
The order matters because each layer feeds the next. Access problems block everything; invoice errors distort VAT returns; unreconciled withholdings and payments then distort the annual return itself. In practice, we help clients work through the six items below in sequence, starting well before the filing deadline rather than in the final weeks.
For newly incorporated companies, this discipline should begin at setup. That is worth remembering when weighing how long company setup in Indonesia takes. Early tax configuration shortens the compliance runway later.
1. PIC, access rights and electronic certificate
Confirm the PIC is correctly appointed, the digital certificate is active and the registered tax types match the company's actual activities. Incorrect PIC configuration can disrupt filing, signing and authorization at the worst possible moment.
2. VAT invoices and PKP data
Reconcile sales e-Faktur, purchase invoices, cancelled invoices and corrected invoices against the general ledger and customer records. This protects the buyer's input VAT credit and keeps the monthly PPN return clean.
3. Withholding tax records
Match PPh 21 payroll filings, PPh 23 payments to residents and PPh 26 payments to non-residents against internal records and counterparty documentation, including payments to an overseas parent company.
4. Payment receipts and billing codes
Collect proof of payment — NTPN numbers, billing codes and correction records — so that tax credit amounts in the annual return match the DJP's payment history exactly.
5. Book-to-tax reconciliation
Adjust accounting profit to taxable income, identifying non-deductible expenses and items requiring tax adjustments. This reconciliation document explains the bridge between the audited-style financial statements and the declared tax base.
6. Related-party and cross-border transactions
Compile the related-party list, contracts, pricing basis, tax treaty documents and certificates of residence. Where transaction amounts meet the relevant thresholds, transfer pricing documentation may also be required alongside the annual return.
Monthly Filing Streams PT PMAs Must Reconcile
| Stream | What it covers | Key reconciliation point |
|---|---|---|
| PPh 21 | Employee salaries, benefits and severance | Payroll register matches filings and payment receipts |
| PPh 23 and PPh 26 | Resident and cross-border service, royalty and interest payments | Withholding certificates match vendor and overseas parent invoices |
| PPh 25 | Monthly corporate income tax installments | Installments roll forward into the annual tax liability |
| PPN (VAT) | Output and input e-Faktur | Sales, purchase, cancelled and corrected invoices reconcile to the ledger |
How Do Monthly Filings Flow Into the Annual Corporate Income Tax Return?
Every monthly stream — PPh 21, PPh 23, PPh 26, PPh 25 and PPN — is a building block the annual return must reconcile against, line by line.
Each monthly stream carries into a specific part of the annual return. The reconciliation is therefore a line-by-line mapping exercise:
- PPh 21: monthly payroll filings must match the payroll register behind the employee benefit deduction in the annual return.
- PPh 23 and PPh 26: monthly withholding on resident and cross-border payments is a remittance obligation. The company must settle it on time, and the annual return then reports these withholdings against services, royalties and interest.
- PPh 25: monthly corporate income tax installments roll forward into the annual tax liability, with any shortfall settled at filing.
- PPN: output and input e-Faktur totals must reconcile with the DJP's own copy of every invoice.
A mismatch in any one stream can surface when the annual return is submitted. Coretax cross-checks the return against the monthly data already in its database, and discrepancies may prompt DJP follow-up.
Annual Return Document Checklist for a PT PMA
| Document category | Examples |
|---|---|
| Financial statements | Balance sheet, income statement, cash flow statement and notes |
| Tax reconciliation | Book-to-tax adjustments and non-deductible expense analysis |
| Monthly tax records | PPh 21, PPh 23, PPh 26, PPh 25 and PPN filings |
| Payment evidence | NTPN numbers, billing codes and correction records |
| Related-party documents | Contracts, pricing basis, treaty forms and certificates of residence |
Which Supporting Documents Does the DJP Expect With the Annual Return?
The DJP expects five document categories: financial statements, tax reconciliation, monthly tax records, payment evidence and related-party documentation.
The five categories work best when assembled progressively. Collecting them close to the 30 April deadline leaves no time to correct errors found late.
Financial statements come first: the balance sheet, income statement and notes must reconcile with the ledger behind the monthly filings. The book-to-tax reconciliation then bridges those statements to taxable income, capturing non-deductible expenses and other adjustments. Monthly tax records — PPh 21, PPh 23, PPh 26, PPh 25 and PPN filings — should be archived by period. Payment evidence, such as NTPN numbers, billing codes and correction records, proves every tax credit claimed. Related-party documents, including contracts, pricing basis and certificates of residence, support the disclosure that may be filed with the return. Transfer pricing documentation is generally prepared and retained when transaction thresholds are met, rather than attached to every filing.
Monthly tax records stay easiest to assemble when each month's filings are closed out promptly. Our infographic on the 7 monthly tax obligations for Indonesia PT PMAs in 2026 helps finance teams keep that rhythm. It carries the detail for each filing through the year.
Conclusion
Coretax CTAS has turned Indonesian tax compliance into a continuous reconciliation exercise rather than a once-a-year filing event. The PT PMAs that fare best in 2026 are those that configure their PIC and taxpayer identity correctly at incorporation. They also keep VAT invoicing disciplined month to month and assemble annual return documents progressively throughout the year.
As a Corporate Services Provider, 3E Accounting Indonesia helps foreign-owned companies manage the full compliance cycle. Our support spans the following services.
- NPWP registration and Coretax activation at incorporation
- Monthly PPh and PPN filings
- Bookkeeping and the annual corporate income tax return, including related-party transaction disclosure
Our teams combine local tax expertise with technology-enabled processes, supported by the 3E Accounting International Network across more than 110 countries.
If your PT PMA is approaching the April 2026 filing deadline, contact us for a setup review. We will identify the reconciliation gaps to close first. The same applies if you are planning a new incorporation under the Coretax regime.
Get Your PT PMA Coretax-Ready for 2026
Speak with 3E Accounting Indonesia about PIC configuration, monthly filing reconciliation and annual return preparation under the Coretax regime.
Frequently Asked Questions
Coretax CTAS is the DJP's integrated Core Tax Administration System, live since 1 January 2025 under PMK-81. It centralizes taxpayer registration, filing, payment, VAT invoicing and authorization in one platform that cross-references data in real time.
For calendar-year companies, the SPT Tahunan Badan deadline for the 2025 tax year is 30 April 2026. The return must reconcile monthly filings, tax payments and related-party transaction documents.
Coretax flags inconsistencies automatically because it holds both the company's records and the counterparty's records. Mismatches can trigger queries, delayed processing and closer scrutiny of VAT credits and withholding tax claims.
Only a PT PMA registered as a PKP must issue e-Faktur through Coretax. Registration becomes mandatory once annual revenue reaches IDR 4.8 billion, and non-PKP companies cannot charge VAT to customers.
Yes. Incorrect invoices can be corrected or cancelled in the system, and filings can be revised, but corrections are far easier before the annual return is submitted than after the DJP identifies the discrepancy itself.
Abigail Yu
Author
Abigail Yu oversees executive leadership at 3E Accounting Group, leading operations, IT solutions, public relations, and digital marketing to drive business success. She holds an honors degree in Communication and New Media from the National University of Singapore and is highly skilled in crisis management, financial communication, and corporate communications.
