Indonesian immigration is governed by the Immigration Law (UU 6/2011, as amended, most recently by UU 63/2024), its implementing regulation (PP 31/2013, as amended by PP 40/2023) and the ministerial regulation on visas and stay permits (Permenkumham 22/2023, as amended by Permenkumham 11/2024). Immigration now sits with the Ministry of Immigration and Corrections (Kementerian Imigrasi dan Pemasyarakatan) (Perpres 157/2024). Permen Imipas 3/2025 Pasal 45 partially revokes and declares ineffective Permenkumham 22/2023 Pasal 43, Pasal 45, and Pasal 52–55 (as amended by Permenkumham 11/2024).
Employing a foreign worker is a separate question governed by manpower law: PP 34/2021 on the Use of Foreign Workers and Permenaker 8/2021. A stay permit (KITAS) lets you stay in Indonesia. It does not by itself settle whether a particular job or paid activity is allowed.
You may still see the term "IMTA" in older material. Under the current regime the employer's approved RPTKA is the basis for employing a foreign worker (PP 34/2021).