Every entry below is the rule as Indonesia publishes it. It is a reference, not a calendar: where a deadline runs from something only you know, this page says so instead of showing a date.
This is the rule as published by the registry, checked against the primary source on the date shown. It is not your filing date. Where a deadline runs from incorporation, from a fiscal year the company itself elects, or from an event only you know about, no date can be derived here at all — the figure you see is the formula, not the answer. Extensions, transitional regimes and entity-specific exemptions are not reflected. Confirm with the registry before you rely on a date.
The company chooses its own year, and that choice is the reason three of the six duties below carry a formula instead of a date. Article 1, number 8 of the Law on General Provisions and Tax Procedures (UU KUP) puts it in one sentence: «Tahun Pajak adalah jangka waktu 1 (satu) tahun kalender kecuali bila Wajib Pajak menggunakan tahun buku yang tidak sama dengan tahun kalender» — the Tax Year is a calendar year, unless the taxpayer uses a book year that is not the same as the calendar year. So the calendar year is the default and not the rule: a company that keeps its books to another cycle is taxed on that cycle, and the same law speaks of a «bagian Tahun Pajak», a part-year, for a period shorter than twelve months. The Company Law (UU 40/2007) counts its own deadlines from the end of the «tahun buku» but, on the articles read, does not define the term and does not say where it is fixed; nothing read states that the two years must coincide, and nothing read states that they may differ, so neither is asserted here. The consequence for this page is concrete. The annual income tax return, the annual report to the general meeting and the audit of the financial statements are all counted from the end of that year, and none of them can be printed as a calendar date until the company says which year it keeps. The three duties that do not depend on it are the two VAT duties, which run from the end of each monthly tax period, and the beneficial owner update, which runs from the company's own last filing.