How do you file taxes in Indonesia in 2026?

Individual annual SPT Tahunan is due no later than three months after the tax year ends, which for calendar-year taxpayers means 31 March. Corporate returns follow a later April window that does not replace your personal filing duty. Employees with Indonesian payroll often see Article 21 withholding each month; withholding reduces the year-end balance but does not always remove the need to submit an annual return when DJP rules say you must file.

Tax residence is not the same label as a friendly KITAS category. DJP guidance treats foreigners as tax residents when they live in Indonesia, stay more than 183 days within any 12 months, or are present in a tax year with intent to reside. Indonesian-source salary, local business income, and other assessable items commonly enter the return. Foreign-source treatment depends on current DJP bulletins and treaty positions, so read pajak.go.id for the year you file rather than an old expat forum rule.

Keep stay and work papers aligned with employer records: Get a KITAS, Get a work permit, and the wider paperwork after moving chain. Banks and payroll desks often ask for NPWP before full features open: Open a bank account.

Use coretaxdjp.pajak.go.id after account activation. Update profile and family-unit data when the portal requires it, answer the confirmation questions that select your attachments, then submit the annual SPT electronically. Collect monthly withholding slips, employer statements, and bank evidence early. Expat households may need tax identity numbers for family members who appear in the family data unit even when those members are not full Indonesian tax subjects; DJP publishes separate NIP guidance for those cases.

Late filing attracts administrative sanctions. Start Coretax activation weeks before 31 March so a forgotten password does not become an overstay-style tax problem.