Frequently Asked Questions: #efin-vs-coretax

They belong to two generations of Indonesian tax administration:

• EFIN (Electronic Filing Identification Number) was the activation code for the DJP’s legacy online systems — issued once per taxpayer to enable e-Filing and related services. For years, “getting your EFIN” was step one of online tax compliance.
• Coretax is the DJP’s integrated tax administration system, phased in from 2025. It replaces the patchwork of e-Filing, e-Faktur and related applications with a single platform in which taxpayers (and their authorised representatives) manage registration, returns, invoices and payments.

What this means in practice:

• New taxpayers are onboarded into Coretax; the EFIN-centred workflow describes the old world
• Existing taxpayers’ records migrated to Coretax; credentials and role assignments (in particular the person in charge / PIC who controls the company’s Coretax access) had to be established in the new system
• The PIC designation matters more than EFIN ever did: whoever is registered as the company’s PIC controls its tax administration, which is why the role should sit with a director or a formally-authorised representative — and why changes of management must be reflected promptly in Coretax
• Transition friction is real: registrations, faktur pajak visibility and system behaviour have all had teething problems since the cutover, and some processes still reference legacy elements

If you are reading older guidance that says “first obtain your EFIN”, you are reading about the previous system. What a new company needs today is proper Coretax registration with a correctly-designated PIC — which Okusi handles as part of tax compliance setup.

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