matsaleh wrote
If you hold any type of temporary or permanent stay permit (ITAS or ITAP) for retirement, investor, spouse, 2nd Home or otherwise, it makes you a resident for taxation by default. Therefore, there are tax implications on your worldwide income, subject to the tax treaty between Indonesia and your home country. Not always followed up by the Indonesian tax department, but happening more frequently of late.
Not systematically dor pensioners receiving an overseas pension.
It depends if there are bilateral agreements between your country of origin (source of your pension) and Indonesia on double taxation avoidance.
Of course if you work or have an income originating from Indonesia you will pay tax on that in Indonesia.